[Lift] Re: Hiring Lift Developers
Dang! No Boston, Sweden :( On Tue, Jun 16, 2009 at 3:02 AM, David LaPalomento dlapalome...@novell.comwrote: As much as I'd love an excuse to fly out to London (or Sydney), you're right, it probably is a bit too much of a stretch :) On Jun 15, 6:51 pm, KWright kev.lee.wri...@googlemail.com wrote: I suspect that London UK would probably be an exception too far! On 15 June, 23:45, David LaPalomento dlapalome...@novell.com wrote: Good point, sorry! Most of the team is located in the Boston area, but we'd probably be willing to make exceptions. On Jun 15, 4:14 pm, KWright kev.lee.wri...@googlemail.com wrote: You forgot to mention where you are in the world, it might be useful to know... :P On 15 June, 18:32, David LaPalomento dlapalome...@novell.com wrote: Hi all, My team has recently started a project based around Lift and we're looking at bringing on some passionate, full-time developers to make that happen. It's a pretty ambitious effort and we expect to be pushing the technology envelope in real-time communication (CometActors have already been a huge help here) and user experience for web applications. If you think you might be interested, drop me an email and I'd be glad to go into greater detail about the project. Also, apologies in advance if I shouldn't be posting this sort of thing to the list. Regards, David -- Viktor Klang Scala Loudmouth --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Lift Jquery autocomplete *** API CHANGE CANDIDATE ***
yes yes yes ... entirely my bad as I missed that out ...
I'll correct it very soon.
Marius
On Jun 16, 3:07 am, Bryan. germ...@gmail.com wrote:
Hi Marius,
I just updated to the tip and got a build failure:
[WARNING] /home/bryan/public-repos/git/liftweb/sites/example/src/main/
scala/net/liftweb/example/snippet/Ajax.scala:65: error: value
autocomplete is not a member of object net.liftweb.http.jquery.JqSHtml
[WARNING] auto - JqSHtml.autocomplete(, buildQuery _, _
= ()))
--Bryan
On Jun 15, 2:16 pm, marius d. marius.dan...@gmail.com wrote:
Folks,
I just made the autocomplete a Lift widget so it does not exist
anymore in JqShtml object. Here is an example on how to use it:
- For Ajax autocomplete
AutoComplete(, (current, limit) = {
println(current = + current)
(1 to limit).map(v = Value_ + v)
}, s = println(submit + s))
- For pre-provided options list
AutoComplete.autocompleteObj(/*same params as bfore*/)
This may break your app but I think it is very easy to update it.
I also fixed some bugs:
1. It didn;t work if the container cookies were turned off
2. hovering on the options list did not work on Ubuntu FF3 at least
due to a capitalizated LI equality test.
If you encounter any problems, please let me know.
Br's,
Marius
On Jun 8, 12:34 pm, Kevin Wright kev.lee.wri...@googlemail.com
wrote:
+1
As an evolving framework, it definitely makes more sense to favour
consistency over backward compatibility at this stage
On Mon, Jun 8, 2009 at 9:00 AM, marius d. marius.dan...@gmail.com wrote:
Other folks, please speak up ! :) ... I will soon migrate this into a
Lift widget.
Br's,
Marius
On Jun 6, 4:53 pm, David Pollak feeder.of.the.be...@gmail.com wrote:
I think I'm using in one place in one project so my api breakage
factor
is
low. I'm okay with moving it unless someone else is going to feel
real
pain.
On Jun 6, 2009 12:24 AM, Marius marius.dan...@gmail.com wrote:
Is there a reason why the JQuery autocomplete is not a Lift widget but
instead it lives in http/jquery package? .. I remember a long time ago
me putting it in the jquery package to separate SHtml stuff that is
dependent on JQuery to the others.
Thoughts?
Br',
Marius
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[Lift] Re: Develop / Production System
Ok, thanks. Well, with the pom.xml file it was a little bit strange. I had to change the Lift version to do the mvn clean install and then change it back. I've no idea why, but it was the only things that helped. Maven stores project dependencies in a repository (by default, its called .m2). When you move a Lift application from one system to another, the repository on the new system may need to be updated, hence your requirement to do a mvn clean install. Don't know what you changed on the pom.xml (if you have any hard coded paths, you might have to change them). On Tue, Jun 16, 2009 at 2:41 AM, Tobias Daub hannes.flo...@gmx.li mailto:hannes.flo...@gmx.li wrote: Hi There, I would like to know whats the best way to move an existing Lift installation from one system to another. I ask this, because I had some problems after I just copied the whole directory (I had to edit the pom.xml file and do mvn clean install). thanks --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: a href... optional query params
Thanks thats how I have done it now but was just checking that there was not some magic that I had missed. -- Ewan On Jun 16, 1:00 am, David Pollak feeder.of.the.be...@gmail.com wrote: On Mon, Jun 15, 2009 at 3:59 PM, Ewan ehar...@gmail.com wrote: Hi all I have bind that renders a link and at the moment I want the link to include a couple of query params ie. a href=/search?q1=v1q2=v2 Click me/a I figured I'd be able to do something like the following except the additional key/id is added which messes it up. value - SHtml.link(/search?q1=v1, () = doSearch, SText(Click me)) How about just hardcoding things and using S.param(q1) to extract the parameters? While it's useful to bind to functions for stateful stuff, if you're just passing some hard coded parameters, it seems to me that you're best off using query parameters. Looking at the src I can't see how this would work. I guess using a requestVar would be the recommended solution but how does that work for bookmarked urls between server restarts? -- Lift, the simply functional web frameworkhttp://liftweb.net Beginning Scalahttp://www.apress.com/book/view/1430219890 Follow me:http://twitter.com/dpp Git some:http://github.com/dpp --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: scala-forum.org is open!
Don't worry about duplication, I removed other post. On Tue, Jun 16, 2009 at 12:45, Christian Helmbold c.helmb...@gmx.de wrote: Hi, the new forum for Scala developers is open: http://scala-forum.org Come in and talk about Scala programming and Scala frameworks! Regards, Christian PS: I hope this message is sent only once - Google told me about troubles and I tried it several times. -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01 --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Mapper or Record?
On 16 Jun 2009, marius d. wrote: Lift Record currently is not implemented for DB interaction but it's targeted for 1.1 release. That probably explains why I couldn't find much when looking through the source :-) I'd say to start development using the Mapper and when Record is ready migrate to the Record. I would expect to be a fairly easy transition from Mapper to Record though. Ok, sounds good. Will mapper be extended in 1.1 or is it only bug fixing and all new development will happen in Record? /Jeppe --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Mapper or Record?
On Jun 16, 3:17 pm, Jeppe Nejsum Madsen je...@ingolfs.dk wrote: On 16 Jun 2009, marius d. wrote: Lift Record currently is not implemented for DB interaction but it's targeted for 1.1 release. That probably explains why I couldn't find much when looking through the source :-) I'd say to start development using the Mapper and when Record is ready migrate to the Record. I would expect to be a fairly easy transition from Mapper to Record though. Ok, sounds good. Will mapper be extended in 1.1 or is it only bug fixing and all new development will happen in Record? I wouldn't expect much new stuff on the Mapper area. It will be maintained though for a long time. So new stuff should come for Record ... /Jeppe --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Develop / Production System
Sometimes (is this, folk-tale or truth?) the maven repository around the application you'reworking on may get slightly out of sync. Then you might need to delete the part of the repository that your application is installed into. On Tue, Jun 16, 2009 at 7:25 PM, Tobias Daub hannes.flo...@gmx.li wrote: Ok, thanks. Well, with the pom.xml file it was a little bit strange. I had to change the Lift version to do the mvn clean install and then change it back. I've no idea why, but it was the only things that helped. Maven stores project dependencies in a repository (by default, its called .m2). When you move a Lift application from one system to another, the repository on the new system may need to be updated, hence your requirement to do a mvn clean install. Don't know what you changed on the pom.xml (if you have any hard coded paths, you might have to change them). On Tue, Jun 16, 2009 at 2:41 AM, Tobias Daub hannes.flo...@gmx.li mailto:hannes.flo...@gmx.li wrote: Hi There, I would like to know whats the best way to move an existing Lift installation from one system to another. I ask this, because I had some problems after I just copied the whole directory (I had to edit the pom.xml file and do mvn clean install). thanks --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Mapper record deletion
As I move deeper into learning Lift, I now want to start deleting
Mapper records in the ToDo example.
Here's how I did it (based on suggestions in this group, I think):
bind ( question, html,
text - ..,
delete - ajaxButton(Text(Remove),
Call(dialog, Str(Do you want to delete the question?)),
() = {q.delete_!; S.notice( Deleted the question!); reDraw
()})
)
.. and then in the template (default.html) ..
script type=javascript
function dialog(text, theCall) {
if (confirm(text)) theCall();
}
/script
-Magnus
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[Lift] Re: security
This looks to be a very significant selling point for Lift. I realize there
are some high level comments about Lift being designed for security, but I
haven't seen any details explaining what measures have been put in place to
qualify those statements. This is a prime example of what should be put
into some marketing detail pages on the wiki. I would love to see a
writeup covering these security measures exhaustively.
On Sat, Jun 13, 2009 at 4:47 PM, David Pollak feeder.of.the.be...@gmail.com
wrote:
On Wed, Jun 10, 2009 at 4:45 PM, Oliver Lambert olambo...@gmail.comwrote:
On Wed, Jun 10, 2009 at 11:58 PM, David Pollak
feeder.of.the.be...@gmail.com wrote:
On Tue, Jun 9, 2009 at 11:39 PM, marius d. marius.dan...@gmail.comwrote:
Hi,
For most apps cannonicalization is not really necessary as the
character stream for form-url-encoded is UTF-8 by default as Lift uses
UTF-8 by default. Oh and the conversion from URL encoding to plain
UTF-8 content is really done by container and when we get the params
from the request object they are already well formed. Now if we're
talking about a higher level of validation that's a different story
and IMO this is an application aspect and not much a framework one.
And Lift does URL Decoding of the paths before presenting them as the
Req() object.
More broadly, Lift should provide all the features of ESAPI out of the
box. If there are particular things that ESAPI offers that Lift doesn't,
please flag them and we'll add them.
I did a bunch of years as VPE and CTO at a web app security company. In
general, I've worked to make sure that Lift has security baked in and that
the developer has to work to make the app insecure, rather than vice versa.
If I missed a spot, Lift will be enhanced to make sure it does have
security baked in.
From my perspective Lift is secure, much more so than other frameworks
I've used. The current set of Lift apps, that I've helped develop, have
survived outsourced penetration testing without requiring any modifications
at all. Great!
I'm not a security expert, but I am being asked to consider ESAPI
features. From my limited understanding, the UTF-8 encoding is fine and Lift
protects the response from displaying any scripts or html that might have
inadvertently been added to the database. The problem is more what is being
validated and how its being validated. I don't buy Marius's claim that this
is somehow a higer order validation that is an application concern rather
than a framework one. The internet has all the insecurities it has, because
security has been left to the application developer.
As far a I can see, one problem lies when a string is obtained from the
web page and instanciated into a String object. For instance, if it comes
in as
scriptalert('XSS')/script, then its probably not what you want.
I see no reason that you don't want this. As long as it's a String, it
will be XML escaped when it's presented to the user. Unless this String
were put into an Unparsed block (some affirmative action by the developer),
it would always appear to the user the way the user typed it. This is the
advantage of keeping everything as XML until just before the page is
delivered to the user.
Why does it matter if something like this gets stored in your database -
perhaps because it's one part of your security. In addition if it comes in
doubly encoded as
%253Cscript%253Ealert('XSS')%253C%252Fscript%253E
then its probably also not what you want.
1) To stop double encoding, ESAPI suggests that you use cannonicalization
to convert the strings to a similar format before validation.
Lift is fact does this. Lift and/or the app server converts the bytes to
Strings using UTF-8 encoding and then splits and URL-decodes the Strings
before delivering them to the application. The application always sees the
String as the user typed the String. All validation is done against Strings
that have been decoded the same way.
2) After, the input has been cannonicalized, ESAPI suggests that the input
should be validated against a whitelist of allowed charaters.
I disagree with this recommendation within the bounds of a Lift app.
Strings in Java survive having \00 characters. They are impurvious to
buffer overflow attacks. Strings are escaped before being used as part of
queries by the JDBC and/or JPA systems (unless the developer explicitly
builds their own query string, which requires that the developer sign and
date the code and is a place where one can grep for the construct during a
code review.) Strings back out to XML or XHTML will be escaped properly,
unless the developer uses Unparsed() in rendering... once again, something
that can be easily checked for in a code review.
The above rules don't apply to PHP or other code that builds queries from
raw Strings. The above rules don't apply to any templating system (all that
I know of except perhaps
[Lift] Re: file upload
I'm still stuck on this problem.
Just bringing it to the top of the list again so it's not forgotten...
On Jun 15, 4:04 pm, DavidV david.v.villa...@gmail.com wrote:
I was able to find the code and have a program ready to parse the
files as soon as I can upload them. I tried writing my own version of
the code found
here:http://github.com/dpp/liftweb/blob/dcc7b064a42832b06e4523d1a35351967d...
but I got the following error when I tried to load the page on my
browser:
XML Parsing Error: prefix not bound to a namespace
Location:http://localhost:8080/analysis/inprocess
Line Number 78, Column 1:
choose:post
^
I am not sure what choose is or where to find it and am having
trouble finding documentation online. I am still working with
Lift-1.0, could this be the problem?
Thanks,
David
On Jun 12, 6:35 am, wapgui torsten.schm...@wapgui.com wrote:
I do similar things.
First there is a snippet using the bind functionality.
var image : FileParamHolder = _
bind(widget, xhtml,
image - fileUpload(image = _)
}
Now write out:
val wbos : ByteArrayOutputStream = build(image)
val fout = new File(outputFilename)
if (fout.exists()) {
Log.error(Tried to overwrite existing file)
return Error: Filename already exists}
val foStream = new FileOutputStream(fout)
foStream.write(wbos.toByteArray())
foStream.close()
def build(image : FileParamHolder) : ByteArrayOutputStream = {
val bout = new ByteArrayOutputStream()
val zipout : ZipOutputStream = new ZipOutputStream(bout)
zipout.setMethod(ZipOutputStream.DEFLATED);
zipout.setLevel(Deflater.DEFAULT_COMPRESSION);
writeImage(zos, image)
}
private def writeImage(zos: ZipOutputStream,
image:FileParamHolder):Unit = {
if (image.fileName == ) {
Log.info(Provided image file is null)
return
}
if (image.fileName.lastIndexOf(\\) != -1) //this is needed if
upload is from a windows system
zos.putNextEntry(new ZipEntry(res/ + image.fileName.substring
(image.fileName.lastIndexOf(\\)+1)))
else
zos.putNextEntry(new ZipEntry(res/ + image.fileName))
zos.write(image.file, 0, image.file.length) //make here a loop on
very large files
zos.closeEntry()
}
Cheers
Torsten
On Jun 11, 10:24 pm, DavidV david.v.villa...@gmail.com wrote:
I would like to upload a .csv file onto the web server so I can then
parse it in my webapp, and put certain fields into my database. I
would like a Browse... button, much like the one shown on this Lift
example page:http://demo.liftweb.net/file_upload
Can anyone point me in the right direction as to how to get started
doing this, or tell me where I can find the example code for the link
I provided? I can't seem to locate it in liftweb in github
thanks,
David
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[Lift] sample code for using JDO on GAE/J
Hi there, I have pushed a sample code for using JDO on GAE/J to github. It has been named as lift-gae-jdo and located at http://github.com/ymnk/lift-gae-jdo/tree/master The latest version of Its README is available at http://github.com/ymnk/lift-gae-jdo/blob/ac06f6460bda5013acc2dc07fd65491a2be65dc0/README Enjoy! Sincerely, -- Atsuhiko Yamanaka JCraft,Inc. 1-14-20 HONCHO AOBA-KU, SENDAI, MIYAGI 980-0014 Japan. Tel +81-22-723-2150 +1-415-578-3454 Skype callto://jcraft/ --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: file upload
Take a look at:
http://github.com/dpp/liftweb/blob/dcc7b064a42832b06e4523d1a35351967d7a46b2/sites/example/src/main/scala/net/liftweb/example/snippet/Misc.scala#L119
It should cast some light on your issue.
On Jun 16, 9:54 am, DavidV david.v.villa...@gmail.com wrote:
I'm still stuck on this problem.
Just bringing it to the top of the list again so it's not forgotten...
On Jun 15, 4:04 pm, DavidV david.v.villa...@gmail.com wrote:
I was able to find the code and have a program ready to parse the
files as soon as I can upload them. I tried writing my own version of
the code found
here:http://github.com/dpp/liftweb/blob/dcc7b064a42832b06e4523d1a35351967d...
but I got the following error when I tried to load the page on my
browser:
XML Parsing Error: prefix not bound to a namespace
Location:http://localhost:8080/analysis/inprocess
Line Number 78, Column 1:
choose:post
^
I am not sure what choose is or where to find it and am having
trouble finding documentation online. I am still working with
Lift-1.0, could this be the problem?
Thanks,
David
On Jun 12, 6:35 am, wapgui torsten.schm...@wapgui.com wrote:
I do similar things.
First there is a snippet using the bind functionality.
var image : FileParamHolder = _
bind(widget, xhtml,
image - fileUpload(image = _)
}
Now write out:
val wbos : ByteArrayOutputStream = build(image)
val fout = new File(outputFilename)
if (fout.exists()) {
Log.error(Tried to overwrite existing file)
return Error: Filename already exists}
val foStream = new FileOutputStream(fout)
foStream.write(wbos.toByteArray())
foStream.close()
def build(image : FileParamHolder) : ByteArrayOutputStream = {
val bout = new ByteArrayOutputStream()
val zipout : ZipOutputStream = new ZipOutputStream(bout)
zipout.setMethod(ZipOutputStream.DEFLATED);
zipout.setLevel(Deflater.DEFAULT_COMPRESSION);
writeImage(zos, image)
}
private def writeImage(zos: ZipOutputStream,
image:FileParamHolder):Unit = {
if (image.fileName == ) {
Log.info(Provided image file is null)
return
}
if (image.fileName.lastIndexOf(\\) != -1) //this is needed if
upload is from a windows system
zos.putNextEntry(new ZipEntry(res/ + image.fileName.substring
(image.fileName.lastIndexOf(\\)+1)))
else
zos.putNextEntry(new ZipEntry(res/ + image.fileName))
zos.write(image.file, 0, image.file.length) //make here a loop on
very large files
zos.closeEntry()
}
Cheers
Torsten
On Jun 11, 10:24 pm, DavidV david.v.villa...@gmail.com wrote:
I would like to upload a .csv file onto the web server so I can then
parse it in my webapp, and put certain fields into my database. I
would like a Browse... button, much like the one shown on this Lift
example page:http://demo.liftweb.net/file_upload
Can anyone point me in the right direction as to how to get started
doing this, or tell me where I can find the example code for the link
I provided? I can't seem to locate it in liftweb in github
thanks,
David
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[Lift] Re: file upload
yes, that's what I was looking for. thanks!
On Jun 16, 11:11 am, TylerWeir tyler.w...@gmail.com wrote:
Take a look
at:http://github.com/dpp/liftweb/blob/dcc7b064a42832b06e4523d1a35351967d...
It should cast some light on your issue.
On Jun 16, 9:54 am, DavidV david.v.villa...@gmail.com wrote:
I'm still stuck on this problem.
Just bringing it to the top of the list again so it's not forgotten...
On Jun 15, 4:04 pm, DavidV david.v.villa...@gmail.com wrote:
I was able to find the code and have a program ready to parse the
files as soon as I can upload them. I tried writing my own version of
the code found
here:http://github.com/dpp/liftweb/blob/dcc7b064a42832b06e4523d1a35351967d...
but I got the following error when I tried to load the page on my
browser:
XML Parsing Error: prefix not bound to a namespace
Location:http://localhost:8080/analysis/inprocess
Line Number 78, Column 1:
choose:post
^
I am not sure what choose is or where to find it and am having
trouble finding documentation online. I am still working with
Lift-1.0, could this be the problem?
Thanks,
David
On Jun 12, 6:35 am, wapgui torsten.schm...@wapgui.com wrote:
I do similar things.
First there is a snippet using the bind functionality.
var image : FileParamHolder = _
bind(widget, xhtml,
image - fileUpload(image = _)
}
Now write out:
val wbos : ByteArrayOutputStream = build(image)
val fout = new File(outputFilename)
if (fout.exists()) {
Log.error(Tried to overwrite existing file)
return Error: Filename already exists}
val foStream = new FileOutputStream(fout)
foStream.write(wbos.toByteArray())
foStream.close()
def build(image : FileParamHolder) : ByteArrayOutputStream = {
val bout = new ByteArrayOutputStream()
val zipout : ZipOutputStream = new ZipOutputStream(bout)
zipout.setMethod(ZipOutputStream.DEFLATED);
zipout.setLevel(Deflater.DEFAULT_COMPRESSION);
writeImage(zos, image)
}
private def writeImage(zos: ZipOutputStream,
image:FileParamHolder):Unit = {
if (image.fileName == ) {
Log.info(Provided image file is null)
return
}
if (image.fileName.lastIndexOf(\\) != -1) //this is needed if
upload is from a windows system
zos.putNextEntry(new ZipEntry(res/ + image.fileName.substring
(image.fileName.lastIndexOf(\\)+1)))
else
zos.putNextEntry(new ZipEntry(res/ + image.fileName))
zos.write(image.file, 0, image.file.length) //make here a loop on
very large files
zos.closeEntry()
}
Cheers
Torsten
On Jun 11, 10:24 pm, DavidV david.v.villa...@gmail.com wrote:
I would like to upload a .csv file onto the web server so I can then
parse it in my webapp, and put certain fields into my database. I
would like a Browse... button, much like the one shown on this Lift
example page:http://demo.liftweb.net/file_upload
Can anyone point me in the right direction as to how to get started
doing this, or tell me where I can find the example code for the link
I provided? I can't seem to locate it in liftweb in github
thanks,
David
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[Lift] Re: scalajpa - while accessing two distincts databases, the second access is made with a connection to the first database
For your information, here is an extract of source code of RequestVarEM :
Trait RequestVarEM extends ScalaEntityManager with ScalaEMFactory {
object emVar extends RequestVar[EntityManager](openEM()) { ... }
}
EntityManager is stored in the singleton emVar; so, all db access of Model
objects are made using the singleton emVar.
= trait RequestVarEM allow only one connection to a database within the
same HttpRequest context.
Jean-Luc
2009/6/15 Jean-Luc jlcane...@gmail.com
Hello,
I have two databases, db1 (a.k.a. Motorbike) and db2 (a.k.a. Motorway)
defined with RequestVarEM :
- object ModelDb1 extends LocalEMF(db1) with RequestVarEM // Motorbike
database
- object ModelDb2 extends LocalEMF(db2) with RequestVarEM // Motorway
database
I thought one could access to any databases independently from any snippet
as long as the correct Model object were used (ModelDb1 or ModelDb2 for
exemple) ; but when I access both databases from the same page, the second
database access issues a Named query not found exception.
I have two snippets, one to display a list of motorbike, another to
display a list of motorway :
- page1 :
ModelDb1.createNamedQuery[Motorbike](Motorbike.findAll).getResultList() =
ok
- page2
: ModelDb2.createNamedQuery[Motorway](Motorway.findAll).getResultList() =
ok
- page3 : calling from page 3 motorbike motorway snippets : Named query
not found: Motorway.findAll
- page4 : calling from page 4 motorway motorbike snippets : Named query
not found: Motorbike.findAll
- page3 changing the query of *Motorway* snippet :
-
ModelDb2.createNamedQuery[*Motorbike*](*Motorbike*.findAll).getResultList()
= it's ok and I do NOT have an exception !
I joined a sample application, ...
any idea about this issue ?
(bad use of LocalEMF in the application code ? issue with LocalEMF or
RequestVarEM ?)
Jean-Luc
PS :
I don't know if it's related but I have this in the log :
[INFO] Checking for multiple versions of scala
[WARNING] Multiple versions of scala libraries detected!
--
Jean-Luc Canela
jlcane...@gmail.com
--
Jean-Luc Canela
jlcane...@gmail.com
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[Lift] Re: links, menu items and mega user
There are two ways to handle simple links: 1. If you want some function to be executed when the link is clicked, use SHtml.link from a snippet or view: SHtml.link(page2, () = ..., Text(Some Link)) 2. If you just want a link, just use plain XHTML: a href=page2 Some Link/a. Note that in either case we leave the suffix off of the target page. This is because Lift will try a variety of suffixes to match language and file type automatically. Derek On Mon, Jun 15, 2009 at 6:10 AM, mr revuza rev...@gmail.com wrote: Just getting started previewing Lift. It looks cool. The demos looks cool as does the todo sample. One thing I do not see is an example of doing a simple link to another page (ie. from page1.html adding an a tag to page2.html). Is there an appropriate lift:? incantation to link to another page that is not registered as a menu item? Is there some other place in the bootstrap where pages would be listed? Or is it appropriate add the full path to page2.html from within page1.html and be done? Also, is there an example available of hiding menu items for users that are not logged in? For example, if I wanted to add an Add Todo and View Todo item to the menu only once the user has logged in. Finally, is there an example available of overriding some of the behavior of the MetaMegaProtoUser? For example if I did not want to have a timezone or locale column, or perhaps at the least not exposing those through the sign up page? Thank you for you insights --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Redirect after login
David, Glenn,
Many thanks to the thread, I realized how to redirect a user the page
he/she was going to load after his/her logon. In this case, I believe
it's better to re-implement usual IfLoggedIn (instead of overriding
User.login):
lazy val IfLoggedIn = If(User.loggedIn_? _, loginAndComeBack _)
def loginAndComeBack = {
val uri = S.uri
RedirectWithState(loginUri, RedirectState( () = User.loginReferer
(uri), ?(notlogged) - NoticeType.Notice ) )
}
lazy val loginUri = SiteMap.findLoc(Login).map{ _.link.uriList }.
openOr(LiftRules.siteMapFailRedirectLocation).mkString(/, /, )
Alexander
On 19 май, 02:57, David Pollak feeder.of.the.be...@gmail.com wrote:
Glenn,
Sorry... my mistake... the following code works:
object loginReferer extends SessionVar(/)
override def homePage = {
var ret = loginReferer.*is*
loginReferer.remove()
ret
}
override def login = {
for (r - S.referer if loginReferer.is == /) loginReferer.set(r)
super.login
}
Note the is which extracts the contents from the SessionVar before it's
reset.
On Sun, May 17, 2009 at 10:30 AM, glenn gl...@exmbly.com wrote:
David,
I was a little puzzled by the line, in the override of def homePage,
of loginReferer.remove(). This actually resets the homePage to /.
Removing the line has the intended result. But, then I need a way
to reset the loginReferer session variable.
Yeah... the reset happened before the old value was removed from the
SessionVar. The above code fixes the problem.
Better still, it would be nice to be able to create additional
stateful
parameter maps, something like Seam's conversation state, which
would make creation of wizards a breeze.
There's some of that we StatefulSnippets... seehttp://demo.liftweb.net/arc
I'm hoping that we'll get full wizard support in Lift for 1.1
(seehttps://www.lostlake.org/wizard.wmvexcept using a DSL like SiteMap rather
than XML).
This brings up another point. The only way I trust to trace the code
to determine what's going on is the old-fashioned way, of putting in
a bunch of println statements in my code. With lift's flow back-and-
forth
between templates, which are really client-side, and snippets, which
are on the server, normal java debugging tools just doesn't work.
That's strange. There's nothing rendered to the client until all the
template stuff is fully rendered (the templates are processed by the server
and the snippets are invoked as the lift:xxx/ tags are encountered during
the first re-write phase of template process.)
People have had success setting breakpoints in Eclipse, NetBeans and
IntelliJ in Lift apps. I use println personally.
Thanks,
David
This makes developing a slow process and can even offset the gains
lift brings to coding efficiency.
What do you, and other's use for debugging that might help.
Thanks in advance for your assistance.
Glenn...
On May 15, 3:35 pm, David Pollak feeder.of.the.be...@gmail.com
wrote:
In your User object, do the following:
object loginReferer extends SessionVar(/)
override def homePage = {
var ret = loginReferer
loginReferer.remove()
ret
}
override def login = {
for (r - S.referer if loginReferer.is == /) loginReferer.set(r)
super.login
}
So, we're setting up a session variable the keeps track of the referer to
the login page.
We define the homePage method to return this page, but reset after use.
And we override the login method to record the referer.
On Fri, May 15, 2009 at 3:11 PM, glenn gl...@exmbly.com wrote:
I'm using ProtoUser. But even so, I thought that I might have to
create a
bunch of separate login pages, each using the loginXhtml form so that
action={S.uri} would generate the links to match with the cases. In
that
way I could do the redirection. But that seems convoluted, to me.
This goes back to using EarlyAccess on a menu item, redirecting to the
appropriate
login page, and then once the user logs in, he is immediately taken to
a new page
rather than back to /index. Really, what I'm trying to do is create
a wizard widget
or sorts, to perform a sequence of tasks with a finish button on the
last page.
Glenn...
On May 15, 2:43 pm, David Pollak feeder.of.the.be...@gmail.com
wrote:
On your login page, you can capture the referer and then redirect to
the
refering page on successful login.
Are you using ProtoUser or are you rolling your own login page?
On Fri, May 15, 2009 at 1:27 PM, glenn gl...@exmbly.com wrote:
If I wanted to redirect the user to a different page, depending on
what page they were on when they initiated a login,
does anyone know of a good solution?
I'm thinking I need to use a DispatchLocSnippets and define
different
dispatch case functions. But I'm not clear how best to go about it?
Would I
[Lift] Re: sample code for using JDO on GAE/J
Excellent! On Tue, Jun 16, 2009 at 7:42 AM, Atsuhiko Yamanaka atsuhiko.yaman...@gmail.com wrote: Hi there, I have pushed a sample code for using JDO on GAE/J to github. It has been named as lift-gae-jdo and located at http://github.com/ymnk/lift-gae-jdo/tree/master The latest version of Its README is available at http://github.com/ymnk/lift-gae-jdo/blob/ac06f6460bda5013acc2dc07fd65491a2be65dc0/README Enjoy! Sincerely, -- Atsuhiko Yamanaka JCraft,Inc. 1-14-20 HONCHO AOBA-KU, SENDAI, MIYAGI 980-0014 Japan. Tel +81-22-723-2150 +1-415-578-3454 Skype callto://jcraft/ -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Git some: http://github.com/dpp --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Lift Jquery autocomplete *** API CHANGE CANDIDATE ***
Whenever I see msys I hear emesis in my head. Emesis is the medical term
for vomiting.
On 6/16/09, marius d. marius.dan...@gmail.com wrote:
two things:
1. Hate msysgit
2. Thanks to Jorge for his help in committing the file
Marius
On Jun 16, 9:41 am, marius d. marius.dan...@gmail.com wrote:
yes yes yes ... entirely my bad as I missed that out ...
I'll correct it very soon.
Marius
On Jun 16, 3:07 am, Bryan. germ...@gmail.com wrote:
Hi Marius,
I just updated to the tip and got a build failure:
[WARNING] /home/bryan/public-repos/git/liftweb/sites/example/src/main/
scala/net/liftweb/example/snippet/Ajax.scala:65: error: value
autocomplete is not a member of object net.liftweb.http.jquery.JqSHtml
[WARNING] auto - JqSHtml.autocomplete(, buildQuery _, _
= ()))
--Bryan
On Jun 15, 2:16 pm, marius d. marius.dan...@gmail.com wrote:
Folks,
I just made the autocomplete a Lift widget so it does not exist
anymore in JqShtml object. Here is an example on how to use it:
- For Ajax autocomplete
AutoComplete(, (current, limit) = {
println(current = + current)
(1 to limit).map(v = Value_ + v)
}, s = println(submit + s))
- For pre-provided options list
AutoComplete.autocompleteObj(/*same params as bfore*/)
This may break your app but I think it is very easy to update it.
I also fixed some bugs:
1. It didn;t work if the container cookies were turned off
2. hovering on the options list did not work on Ubuntu FF3 at least
due to a capitalizated LI equality test.
If you encounter any problems, please let me know.
Br's,
Marius
On Jun 8, 12:34 pm, Kevin Wright kev.lee.wri...@googlemail.com
wrote:
+1
As an evolving framework, it definitely makes more sense to favour
consistency over backward compatibility at this stage
On Mon, Jun 8, 2009 at 9:00 AM, marius d. marius.dan...@gmail.com
wrote:
Other folks, please speak up ! :) ... I will soon migrate this
into a
Lift widget.
Br's,
Marius
On Jun 6, 4:53 pm, David Pollak feeder.of.the.be...@gmail.com
wrote:
I think I'm using in one place in one project so my api
breakage factor
is
low. I'm okay with moving it unless someone else is going to
feel real
pain.
On Jun 6, 2009 12:24 AM, Marius marius.dan...@gmail.com
wrote:
Is there a reason why the JQuery autocomplete is not a Lift
widget but
instead it lives in http/jquery package? .. I remember a long
time ago
me putting it in the jquery package to separate SHtml stuff
that is
dependent on JQuery to the others.
Thoughts?
Br',
Marius
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[Lift] Re: Lift Jquery autocomplete *** API CHANGE CANDIDATE ***
How about vmware and Linux as your dev platform? Just askin'
On Tue, Jun 16, 2009 at 12:16 AM, marius d. marius.dan...@gmail.com wrote:
two things:
1. Hate msysgit
2. Thanks to Jorge for his help in committing the file
Marius
On Jun 16, 9:41 am, marius d. marius.dan...@gmail.com wrote:
yes yes yes ... entirely my bad as I missed that out ...
I'll correct it very soon.
Marius
On Jun 16, 3:07 am, Bryan. germ...@gmail.com wrote:
Hi Marius,
I just updated to the tip and got a build failure:
[WARNING] /home/bryan/public-repos/git/liftweb/sites/example/src/main/
scala/net/liftweb/example/snippet/Ajax.scala:65: error: value
autocomplete is not a member of object net.liftweb.http.jquery.JqSHtml
[WARNING] auto - JqSHtml.autocomplete(, buildQuery _, _
= ()))
--Bryan
On Jun 15, 2:16 pm, marius d. marius.dan...@gmail.com wrote:
Folks,
I just made the autocomplete a Lift widget so it does not exist
anymore in JqShtml object. Here is an example on how to use it:
- For Ajax autocomplete
AutoComplete(, (current, limit) = {
println(current = + current)
(1 to limit).map(v = Value_ + v)
}, s = println(submit + s))
- For pre-provided options list
AutoComplete.autocompleteObj(/*same params as bfore*/)
This may break your app but I think it is very easy to update it.
I also fixed some bugs:
1. It didn;t work if the container cookies were turned off
2. hovering on the options list did not work on Ubuntu FF3 at least
due to a capitalizated LI equality test.
If you encounter any problems, please let me know.
Br's,
Marius
On Jun 8, 12:34 pm, Kevin Wright kev.lee.wri...@googlemail.com
wrote:
+1
As an evolving framework, it definitely makes more sense to favour
consistency over backward compatibility at this stage
On Mon, Jun 8, 2009 at 9:00 AM, marius d. marius.dan...@gmail.com
wrote:
Other folks, please speak up ! :) ... I will soon migrate this
into a
Lift widget.
Br's,
Marius
On Jun 6, 4:53 pm, David Pollak feeder.of.the.be...@gmail.com
wrote:
I think I'm using in one place in one project so my api
breakage factor
is
low. I'm okay with moving it unless someone else is going to
feel real
pain.
On Jun 6, 2009 12:24 AM, Marius marius.dan...@gmail.com
wrote:
Is there a reason why the JQuery autocomplete is not a Lift
widget but
instead it lives in http/jquery package? .. I remember a long
time ago
me putting it in the jquery package to separate SHtml stuff
that is
dependent on JQuery to the others.
Thoughts?
Br',
Marius
--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
Git some: http://github.com/dpp
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[Lift] Difference between running from command line and from Eclipse
I've created a test hello-world lift project and it runs fine. http://wiki.liftweb.net/index.php/HowTo_start_a_new_liftwebapp also I've imported this project to Eclipse (mvn eclipse:eclipse) and import from Eclipse. I'm currently using m2eclipse (http:// m2eclipse.codehaus.org/), but before I tried Eclipse IAM with same result: error in src/test/scala/RunWebApp.scala import _root_.org.mortbay.jetty.webapp.WebAppContext = WebAppContext is not in webapp project still runs from command line and fails in Eclipse I tried to create lift projects with maven in eclipse with same result - that error I'm on Windows What is the difference beween running from command line and Eclipse and is there a way to fix it? --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] article proposal : How to code a multi-criteria search form using Hibernate Criteria API
Hello, I propose to write an article about How to code a multi-criteria search form using Hibernate Criteria API. Before starting, I'd like to check : - if no such article is being written ... - if someone is interested by the subject Jean-Luc -- Jean-Luc Canela jlcane...@gmail.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Develop / Production System
On Tue, Jun 16, 2009 at 6:43 AM, Oliver Lambert olambo...@gmail.com wrote: Sometimes (is this, folk-tale or truth?) the maven repository around the application you'reworking on may get slightly out of sync. Then you might need to delete the part of the repository that your application is installed into. I typically do an rm -rf ~/.m2 once every few weeks... the maven repo gets rebuilt and life goes in... but that's just me. On Tue, Jun 16, 2009 at 7:25 PM, Tobias Daub hannes.flo...@gmx.li wrote: Ok, thanks. Well, with the pom.xml file it was a little bit strange. I had to change the Lift version to do the mvn clean install and then change it back. I've no idea why, but it was the only things that helped. Maven stores project dependencies in a repository (by default, its called .m2). When you move a Lift application from one system to another, the repository on the new system may need to be updated, hence your requirement to do a mvn clean install. Don't know what you changed on the pom.xml (if you have any hard coded paths, you might have to change them). On Tue, Jun 16, 2009 at 2:41 AM, Tobias Daub hannes.flo...@gmx.li mailto:hannes.flo...@gmx.li wrote: Hi There, I would like to know whats the best way to move an existing Lift installation from one system to another. I ask this, because I had some problems after I just copied the whole directory (I had to edit the pom.xml file and do mvn clean install). thanks -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Git some: http://github.com/dpp --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Getting Started Issue
Thanks for answering your own question. :-) On Mon, Jun 15, 2009 at 3:13 PM, Chris Lamey cla...@gmail.com wrote: FYI - I had to specify the full name to get it to work: ./apache-maven-2.0.10/bin/mvn -e org.apache.maven.plugins:maven- archetype-plugin:2.0-alpha-4:generate -U - DarchetypeGroupId=net.liftweb -DarchetypeArtifactId=lift-archetype- blank -DarchetypeVersion=1.0 -DremoteRepositories=http://scala- tools.org/repo-releases -DgroupId=demo.helloworld - DartifactId=helloworld -Dversion=1.0-SNAPSHOT Thanks, Chris On Jun 15, 3:30 pm, Chris Lamey cla...@gmail.com wrote: Heya, I'm on Mac OS X 10.5 using Java 1.6.0_07 and Maven 2.0.10. I'm following the Getting Started guide here: http://liftweb.net/docs/getting_started/mod_master.html And am running into a maven issue with the first application: clameylt:~/tmp/lift ./apache-maven-2.0.10/bin/mvn -e archetype:generate -U -DarchetypeGroupId=net.liftweb - DarchetypeArtifactId=lift-archetype-blank -DarchetypeVersion=1.0 - DremoteRepositories=http://scala-tools.org/repo-releases- DgroupId=demo.helloworld -DartifactId=helloworld -Dversion=1.0- SNAPSHOT + Error stacktraces are turned on. [INFO] Scanning for projects... [INFO] Searching repository for plugin with prefix: 'archetype'. [INFO] org.apache.maven.plugins: checking for updates from lm [INFO] org.apache.maven.plugins: checking for updates from central [INFO] org.codehaus.mojo: checking for updates from lm [INFO] org.codehaus.mojo: checking for updates from central [INFO] artifact org.apache.maven.plugins:maven-archetype-plugin: checking for updates from lm [INFO] artifact org.apache.maven.plugins:maven-archetype-plugin: checking for updates from central [INFO] [ERROR] BUILD FAILURE [INFO] [INFO] Required goal not found: archetype:generate in org.apache.maven.plugins:maven-archetype-plugin:1.0-alpha-4 [INFO] [INFO] Trace org.apache.maven.BuildFailureException: Required goal not found: archetype:generate in org.apache.maven.plugins:maven-archetype-plugin: 1.0-alpha-4 at org.apache.maven.lifecycle.DefaultLifecycleExecutor.getMojoDescriptor (DefaultLifecycleExecutor.java:1559) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.segmentTaskListByAggregationNeeds (DefaultLifecycleExecutor.java:406) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute (DefaultLifecycleExecutor.java:137) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java: 336) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java: 129) at org.apache.maven.cli.MavenCli.main(MavenCli.java:301) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.codehaus.classworlds.Launcher.launchEnhanced (Launcher.java:315) at org.codehaus.classworlds.Launcher.launch(Launcher.java:255) at org.codehaus.classworlds.Launcher.mainWithExitCode (Launcher.java:430) at org.codehaus.classworlds.Launcher.main(Launcher.java:375) [INFO] [INFO] Total time: 1 second [INFO] Finished at: Mon Jun 15 15:25:18 MDT 2009 [INFO] Final Memory: 1M/4M [INFO] The doc says Maven 2.0.9 or greater, has anyone run this with 2.0.10? Thanks, Chris -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Git some: http://github.com/dpp --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Difference between running from command line and from Eclipse
On 16 Jun 2009, ph wrote: I've created a test hello-world lift project and it runs fine. http://wiki.liftweb.net/index.php/HowTo_start_a_new_liftwebapp also I've imported this project to Eclipse (mvn eclipse:eclipse) and import from Eclipse. I'm currently using m2eclipse (http:// m2eclipse.codehaus.org/), but before I tried Eclipse IAM with same result: error in src/test/scala/RunWebApp.scala import _root_.org.mortbay.jetty.webapp.WebAppContext = WebAppContext is not in webapp project still runs from command line and fails in Eclipse I tried to create lift projects with maven in eclipse with same result - that error I'm on Windows I had the same problems. IIRC, it's a problem with the build path source folders/multiple output folders generated by the mvn eclipse plugin. I fixed this by manually deleting the source folders in eclipse and then adding src/main/scala src/test/scala as source folders (using the default output folder) /Jeppe --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Difference between running from command line and from Eclipse
Thank you for the reply, however I don't think this is the issue (I tried and that didn't work).Seems like issue in which version of Jetty is used. Maven generates pom file with jetty version [6.1.16,) and this works from command line, in Eclipse however it tries to use version 7.0.0.pre5 (I see it in dependencies). Changing jetty to version 7.0.0.pre5 in pom forces same error running from command line. The question is how to make maven plugin Eclipse use jetty v6 and not 7 pre5. On Tue, Jun 16, 2009 at 15:32, Jeppe Nejsum Madsen je...@ingolfs.dk wrote: On 16 Jun 2009, ph wrote: I've created a test hello-world lift project and it runs fine. http://wiki.liftweb.net/index.php/HowTo_start_a_new_liftwebapp also I've imported this project to Eclipse (mvn eclipse:eclipse) and import from Eclipse. I'm currently using m2eclipse (http:// m2eclipse.codehaus.org/), but before I tried Eclipse IAM with same result: error in src/test/scala/RunWebApp.scala import _root_.org.mortbay.jetty.webapp.WebAppContext = WebAppContext is not in webapp project still runs from command line and fails in Eclipse I tried to create lift projects with maven in eclipse with same result - that error I'm on Windows I had the same problems. IIRC, it's a problem with the build path source folders/multiple output folders generated by the mvn eclipse plugin. I fixed this by manually deleting the source folders in eclipse and then adding src/main/scala src/test/scala as source folders (using the default output folder) /Jeppe --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Difference between running from command line and from Eclipse
oups (old version) set the version to 6.1.17 or any 6.1.x and remove range version indicator [ and ,) On Tue, Jun 16, 2009 at 22:14, Philippe Kirsanov pkirsa...@gmail.comwrote: Thank you for the reply, however I don't think this is the issue (I tried and that didn't work).Seems like issue in which version of Jetty is used. Maven generates pom file with jetty version [6.1.16,) and this works from command line, in Eclipse however it tries to use version 7.0.0.pre5 (I see it in dependencies). Changing jetty to version 7.0.0.pre5 in pom forces same error running from command line. The question is how to make maven plugin Eclipse use jetty v6 and not 7 pre5. On Tue, Jun 16, 2009 at 15:32, Jeppe Nejsum Madsen je...@ingolfs.dkwrote: On 16 Jun 2009, ph wrote: I've created a test hello-world lift project and it runs fine. http://wiki.liftweb.net/index.php/HowTo_start_a_new_liftwebapp also I've imported this project to Eclipse (mvn eclipse:eclipse) and import from Eclipse. I'm currently using m2eclipse (http:// m2eclipse.codehaus.org/), but before I tried Eclipse IAM with same result: error in src/test/scala/RunWebApp.scala import _root_.org.mortbay.jetty.webapp.WebAppContext = WebAppContext is not in webapp project still runs from command line and fails in Eclipse I tried to create lift projects with maven in eclipse with same result - that error I'm on Windows I had the same problems. IIRC, it's a problem with the build path source folders/multiple output folders generated by the mvn eclipse plugin. I fixed this by manually deleting the source folders in eclipse and then adding src/main/scala src/test/scala as source folders (using the default output folder) /Jeppe --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Firebug error message for AJAX
I'm getting the following error in Firebug:
YAHOO.lift is undefined
url = YAHOO.lift.buildURI(addPageName('/...nSuccess(res);}, failure :
onFailure });
I have the following scripts:
script src=/scripts/yahoo-dom-event/yahoo-dom-event.js
type=text/javascript/script
script src=/scripts/utilities/utilities.js
type=text/javascript/script
script src=/scripts/json/json-min.js type=text/javascript/script
script src=/scripts/connection/connection-min.js
type=text/javascript/script
script type=text/javascript src=/ajax_request/liftAjax.js/script
Any ideas?
Chas.
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[Lift] Re: Difference between running from command line and from Eclipse
On 16 Jun 2009, Philippe Kirsanov wrote: Thank you for the reply, however I don't think this is the issue (I tried and that didn't work).Seems like issue in which version of Jetty is used. Maven generates pom file with jetty version [6.1.16,) and this works from command line, in Eclipse however it tries to use version 7.0.0.pre5 (I see it in dependencies). Changing jetty to version 7.0.0.pre5 in pom forces same error running from command line. The question is how to make maven plugin Eclipse use jetty v6 and not 7 pre5. Ahh sorry, didn't read the error message thoroughly :-) Why not just change jetty to 6.1.16? I went through the same steps some time ago. I'm not quite sure how I got the stuff info Eclipse, but my Eclipse project references jetty-6.1.6. Maybe something has changed in the lift plugin since then. This is from my pom: dependency groupIdorg.mortbay.jetty/groupId artifactIdjetty/artifactId version[6.1.6]/version scopetest/scope /dependency /Jeppe --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: scalajpa - while accessing two distincts databases, the second access is made with a connection to the first database
OK, I just checked in code that should allow this to work. Could you please
test and make sure that it's functioning correctly?
Thanks,
Derek
On 6/16/09, Derek Chen-Becker dchenbec...@gmail.com wrote:
Using multiple EMs was not something I had considered when I wrote this. I
think that I can modify the code to provide a __nameSalt def to
differentiate instances. Let me work on it and I'll have something soon.
Derek
On 6/16/09, Jean-Luc jlcane...@gmail.com wrote:
For your information, here is an extract of source code of RequestVarEM :
Trait RequestVarEM extends ScalaEntityManager with ScalaEMFactory {
object emVar extends RequestVar[EntityManager](openEM()) { ... }
}
EntityManager is stored in the singleton emVar; so, all db access of Model
objects are made using the singleton emVar.
= trait RequestVarEM allow only one connection to a database within the
same HttpRequest context.
Jean-Luc
2009/6/15 Jean-Luc jlcane...@gmail.com
Hello,
I have two databases, db1 (a.k.a. Motorbike) and db2 (a.k.a. Motorway)
defined with RequestVarEM :
- object ModelDb1 extends LocalEMF(db1) with RequestVarEM // Motorbike
database
- object ModelDb2 extends LocalEMF(db2) with RequestVarEM // Motorway
database
I thought one could access to any databases independently from any
snippet as long as the correct Model object were used (ModelDb1 or ModelDb2
for exemple) ; but when I access both databases from the same page, the
second database access issues a Named query not found exception.
I have two snippets, one to display a list of motorbike, another to
display a list of motorway :
- page1 :
ModelDb1.createNamedQuery[Motorbike](Motorbike.findAll).getResultList() =
ok
- page2
: ModelDb2.createNamedQuery[Motorway](Motorway.findAll).getResultList() =
ok
- page3 : calling from page 3 motorbike motorway snippets : Named query
not found: Motorway.findAll
- page4 : calling from page 4 motorway motorbike snippets : Named query
not found: Motorbike.findAll
- page3 changing the query of *Motorway* snippet :
-
ModelDb2.createNamedQuery[*Motorbike*](*Motorbike*.findAll).getResultList()
= it's ok and I do NOT have an exception !
I joined a sample application, ...
any idea about this issue ?
(bad use of LocalEMF in the application code ? issue with LocalEMF or
RequestVarEM ?)
Jean-Luc
PS :
I don't know if it's related but I have this in the log :
[INFO] Checking for multiple versions of scala
[WARNING] Multiple versions of scala libraries detected!
--
Jean-Luc Canela
jlcane...@gmail.com
--
Jean-Luc Canela
jlcane...@gmail.com
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[Lift] Re: Firebug error message for AJAX
I have the import statment and the LiftRules.jsArtifacts = YUIArtifacts
in Boot, but the script tag for the liftYUI.js script is not being
inserted. I guess I could add it manually, but isn't Lift supposed to
insert it?
Thanks!
Chas.
marius d. wrote:
Also please see: http://wiki.liftweb.net/index.php/HowTo_use_Lift_with_YUI
Marius
On Jun 16, 11:58 pm, marius d. marius.dan...@gmail.com wrote:
You need one more
script src=/classpath/liftYUI.js type=text/javascript/script
Br's,
Marius
On Jun 16, 11:30 pm, Charles F. Munat c...@munat.com wrote:
I'm getting the following error in Firebug:
YAHOO.lift is undefined
url = YAHOO.lift.buildURI(addPageName('/...nSuccess(res);}, failure :
onFailure });
I have the following scripts:
script src=/scripts/yahoo-dom-event/yahoo-dom-event.js
type=text/javascript/script
script src=/scripts/utilities/utilities.js
type=text/javascript/script
script src=/scripts/json/json-min.js type=text/javascript/script
script src=/scripts/connection/connection-min.js
type=text/javascript/script
script type=text/javascript src=/ajax_request/liftAjax.js/script
Any ideas?
Chas.
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[Lift] Re: Difference between running from command line and from Eclipse
Thank you changing to version 6.1.17 worked, but interesting that jetty version that is running is still 6.1.16 and Eclipse in editor still complains that there is an error (class missed) [INFO] Starting jetty 6.1.16 ... 2009-06-16 16:31:35.173::INFO: jetty-6.1.16 On Tue, Jun 16, 2009 at 16:23, David Bernard david.bernard...@gmail.comwrote: oups (old version) set the version to 6.1.17 or any 6.1.x and remove range version indicator [ and ,) On Tue, Jun 16, 2009 at 22:14, Philippe Kirsanov pkirsa...@gmail.comwrote: Thank you for the reply, however I don't think this is the issue (I tried and that didn't work). Seems like issue in which version of Jetty is used. Maven generates pom file with jetty version [6.1.16,) and this works from command line, in Eclipse however it tries to use version 7.0.0.pre5 (I see it in dependencies). Changing jetty to version 7.0.0.pre5 in pom forces same error running from command line. The question is how to make maven plugin Eclipse use jetty v6 and not 7 pre5. On Tue, Jun 16, 2009 at 15:32, Jeppe Nejsum Madsen je...@ingolfs.dkwrote: On 16 Jun 2009, ph wrote: I've created a test hello-world lift project and it runs fine. http://wiki.liftweb.net/index.php/HowTo_start_a_new_liftwebapp also I've imported this project to Eclipse (mvn eclipse:eclipse) and import from Eclipse. I'm currently using m2eclipse (http:// m2eclipse.codehaus.org/), but before I tried Eclipse IAM with same result: error in src/test/scala/RunWebApp.scala import _root_.org.mortbay.jetty.webapp.WebAppContext = WebAppContext is not in webapp project still runs from command line and fails in Eclipse I tried to create lift projects with maven in eclipse with same result - that error I'm on Windows I had the same problems. IIRC, it's a problem with the build path source folders/multiple output folders generated by the mvn eclipse plugin. I fixed this by manually deleting the source folders in eclipse and then adding src/main/scala src/test/scala as source folders (using the default output folder) /Jeppe --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Difference between running from command line and from Eclipse
yes, that what I did and workedthanks On Tue, Jun 16, 2009 at 16:36, Jeppe Nejsum Madsen je...@ingolfs.dk wrote: On 16 Jun 2009, Philippe Kirsanov wrote: Thank you for the reply, however I don't think this is the issue (I tried and that didn't work).Seems like issue in which version of Jetty is used. Maven generates pom file with jetty version [6.1.16,) and this works from command line, in Eclipse however it tries to use version 7.0.0.pre5 (I see it in dependencies). Changing jetty to version 7.0.0.pre5 in pom forces same error running from command line. The question is how to make maven plugin Eclipse use jetty v6 and not 7 pre5. Ahh sorry, didn't read the error message thoroughly :-) Why not just change jetty to 6.1.16? I went through the same steps some time ago. I'm not quite sure how I got the stuff info Eclipse, but my Eclipse project references jetty-6.1.6. Maybe something has changed in the lift plugin since then. This is from my pom: dependency groupIdorg.mortbay.jetty/groupId artifactIdjetty/artifactId version[6.1.6]/version scopetest/scope /dependency /Jeppe --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Simple Link
Is there a generator to create a simple non-stateful link, or should I be manually creating the node? Kind Regards, Matt --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: scalajpa - while accessing two distincts databases, the second access is made with a connection to the first database
Derek,
soapbox
You have just demonstrated a process that i have been talking about for the
last 15 years. People have a blind spot when it comes to thinking
compositionally. They think -- almost to a person -- about god's eye view
solutions where there's only one of some key solution component. They don't
think about solutions that are composed of ... (wait for it)... solutions!
It takes some serious training to think compositionally. Compositional
solutions, however, are the only realistic way to scale. When solutions are
compositional, you can *de*compose. The db example is a case in point. One
of the most natural ways to scale data access is sharding and partitioning
-- which requires upfront machinery to support decomposition of the store.
Lest you feel bad, note that some of the best scientific minds of all time
have fallen prey to this blind spot. Newtonian physics as well as Einstein's
update to Newton's proposal is a non-compositional solution. Quantum
mechanics also exhibits compositional failures. This is why physics is
failing to find proposals that link theories of gravitation (essentially
large scale) to quantum mechanical theories of the other forces (essentially
very small scale) -- the physical theories are non-compositional -- they
don't scale!
One of the real things functional programming has going for it is that the
basic model of computation underlying the means of structuring and
manipulating programs is compositional. That's why it is important to have a
technology like Scala resting atop the incumbent execution model (JVM) being
deployed on web-scale problems. Compositionality is the only way to tackle
applications at global scale.
/soapbox
Thanks for getting the fix to this problem in so quickly.
Best wishes,
--greg
On Tue, Jun 16, 2009 at 11:53 AM, Derek Chen-Becker
dchenbec...@gmail.comwrote:
Using multiple EMs was not something I had considered when I wrote this. I
think that I can modify the code to provide a __nameSalt def to
differentiate instances. Let me work on it and I'll have something soon.
Derek
On 6/16/09, Jean-Luc jlcane...@gmail.com wrote:
For your information, here is an extract of source code of RequestVarEM :
Trait RequestVarEM extends ScalaEntityManager with ScalaEMFactory {
object emVar extends RequestVar[EntityManager](openEM()) { ... }
}
EntityManager is stored in the singleton emVar; so, all db access of Model
objects are made using the singleton emVar.
= trait RequestVarEM allow only one connection to a database within the
same HttpRequest context.
Jean-Luc
2009/6/15 Jean-Luc jlcane...@gmail.com
Hello,
I have two databases, db1 (a.k.a. Motorbike) and db2 (a.k.a. Motorway)
defined with RequestVarEM :
- object ModelDb1 extends LocalEMF(db1) with RequestVarEM // Motorbike
database
- object ModelDb2 extends LocalEMF(db2) with RequestVarEM // Motorway
database
I thought one could access to any databases independently from any
snippet as long as the correct Model object were used (ModelDb1 or ModelDb2
for exemple) ; but when I access both databases from the same page, the
second database access issues a Named query not found exception.
I have two snippets, one to display a list of motorbike, another to
display a list of motorway :
- page1 :
ModelDb1.createNamedQuery[Motorbike](Motorbike.findAll).getResultList() =
ok
- page2
: ModelDb2.createNamedQuery[Motorway](Motorway.findAll).getResultList() =
ok
- page3 : calling from page 3 motorbike motorway snippets : Named query
not found: Motorway.findAll
- page4 : calling from page 4 motorway motorbike snippets : Named query
not found: Motorbike.findAll
- page3 changing the query of *Motorway* snippet :
-
ModelDb2.createNamedQuery[*Motorbike*](*Motorbike*.findAll).getResultList()
= it's ok and I do NOT have an exception !
I joined a sample application, ...
any idea about this issue ?
(bad use of LocalEMF in the application code ? issue with LocalEMF or
RequestVarEM ?)
Jean-Luc
PS :
I don't know if it's related but I have this in the log :
[INFO] Checking for multiple versions of scala
[WARNING] Multiple versions of scala libraries detected!
--
Jean-Luc Canela
jlcane...@gmail.com
--
Jean-Luc Canela
jlcane...@gmail.com
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
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To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.com
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[Lift] Re: scalajpa - while accessing two distincts databases, the second access is made with a connection to the first database
I think you have just volunteered to help refactor this code to make it more
composition friendly :)
On Wed, Jun 17, 2009 at 9:38 AM, Meredith Gregory
lgreg.mered...@gmail.comwrote:
Derek,
soapbox
You have just demonstrated a process that i have been talking about for the
last 15 years. People have a blind spot when it comes to thinking
compositionally. They think -- almost to a person -- about god's eye view
solutions where there's only one of some key solution component. They don't
think about solutions that are composed of ... (wait for it)... solutions!
It takes some serious training to think compositionally. Compositional
solutions, however, are the only realistic way to scale. When solutions are
compositional, you can *de*compose. The db example is a case in point. One
of the most natural ways to scale data access is sharding and partitioning
-- which requires upfront machinery to support decomposition of the store.
Lest you feel bad, note that some of the best scientific minds of all time
have fallen prey to this blind spot. Newtonian physics as well as Einstein's
update to Newton's proposal is a non-compositional solution. Quantum
mechanics also exhibits compositional failures. This is why physics is
failing to find proposals that link theories of gravitation (essentially
large scale) to quantum mechanical theories of the other forces (essentially
very small scale) -- the physical theories are non-compositional -- they
don't scale!
One of the real things functional programming has going for it is that the
basic model of computation underlying the means of structuring and
manipulating programs is compositional. That's why it is important to have a
technology like Scala resting atop the incumbent execution model (JVM) being
deployed on web-scale problems. Compositionality is the only way to tackle
applications at global scale.
/soapbox
Thanks for getting the fix to this problem in so quickly.
Best wishes,
--greg
On Tue, Jun 16, 2009 at 11:53 AM, Derek Chen-Becker dchenbec...@gmail.com
wrote:
Using multiple EMs was not something I had considered when I wrote this. I
think that I can modify the code to provide a __nameSalt def to
differentiate instances. Let me work on it and I'll have something soon.
Derek
On 6/16/09, Jean-Luc jlcane...@gmail.com wrote:
For your information, here is an extract of source code of RequestVarEM :
Trait RequestVarEM extends ScalaEntityManager with ScalaEMFactory {
object emVar extends RequestVar[EntityManager](openEM()) { ... }
}
EntityManager is stored in the singleton emVar; so, all db access of
Model objects are made using the singleton emVar.
= trait RequestVarEM allow only one connection to a database within the
same HttpRequest context.
Jean-Luc
2009/6/15 Jean-Luc jlcane...@gmail.com
Hello,
I have two databases, db1 (a.k.a. Motorbike) and db2 (a.k.a. Motorway)
defined with RequestVarEM :
- object ModelDb1 extends LocalEMF(db1) with RequestVarEM //
Motorbike database
- object ModelDb2 extends LocalEMF(db2) with RequestVarEM // Motorway
database
I thought one could access to any databases independently from any
snippet as long as the correct Model object were used (ModelDb1 or ModelDb2
for exemple) ; but when I access both databases from the same page, the
second database access issues a Named query not found exception.
I have two snippets, one to display a list of motorbike, another to
display a list of motorway :
- page1 :
ModelDb1.createNamedQuery[Motorbike](Motorbike.findAll).getResultList() =
ok
- page2
: ModelDb2.createNamedQuery[Motorway](Motorway.findAll).getResultList() =
ok
- page3 : calling from page 3 motorbike motorway snippets : Named
query not found: Motorway.findAll
- page4 : calling from page 4 motorway motorbike snippets : Named
query not found: Motorbike.findAll
- page3 changing the query of *Motorway* snippet :
-
ModelDb2.createNamedQuery[*Motorbike*](*Motorbike*.findAll).getResultList()
= it's ok and I do NOT have an exception !
I joined a sample application, ...
any idea about this issue ?
(bad use of LocalEMF in the application code ? issue with LocalEMF or
RequestVarEM ?)
Jean-Luc
PS :
I don't know if it's related but I have this in the log :
[INFO] Checking for multiple versions of scala
[WARNING] Multiple versions of scala libraries detected!
--
Jean-Luc Canela
jlcane...@gmail.com
--
Jean-Luc Canela
jlcane...@gmail.com
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
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[Lift] Re: Simple Link
On Tue, Jun 16, 2009 at 5:09 PM, Matt Williams m...@makeable.co.uk wrote: I thought as much - I think i've gotten used to helper overload from other frameworks and was looking to keep as much markup out of the snippets as possible. Would it be worth me creating helpers for such trivialities, or are they outside the project scope? I don't think so... I think: aHref(/foo/bar, something) is less meaningful in code than: a href=/foo/barsomething/a However, you should code your sites the way you want and you should build a library that helps you. If you want to open source it, others may find it valuable and may start using it. Thanks, David On Jun 17, 12:54 am, David Pollak feeder.of.the.be...@gmail.com wrote: a href=/mypagego there/a No need for any lift method to help On Jun 16, 2009 4:00 PM, Makeable m...@makeable.co.uk wrote: Is there a generator to create a simple non-stateful link, or should I be manually creating the node? Kind Regards, Matt -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Git some: http://github.com/dpp --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] directory structure
In Boot.scala can I call LiftRules.addToPackages multiple times to add multiple directories with snippets in them? Do I have to have a directory structure ending with snippet, for snippets? Do I need the directories comet, model and view, when they are just empty? cheers Oliver --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: scalajpa - while accessing two distincts databases, the second access is made with a connection to the first database
Greg, On Tue, Jun 16, 2009 at 6:38 PM, Meredith Gregory lgreg.mered...@gmail.comwrote: It takes some serious training to think compositionally. No doubt it is extremely tough to think compositionally, and it's all too easy to fall back on non-compositional ways of thinking. In a similar vein it's all too easy to fall into procedural patterns when learning or working with functional programming in a multi-paradigm language. But what are good ways for programmers to learn to think compositionally and, more importantly, practice? Do you know of any books or online references that might help make the transition for anyone who is interested? Jeremy --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: scalajpa - while accessing two distincts databases, the second access is made with a connection to the first database
Jeremy, Most excellent question award to you, sir! How to bootstrap thinking compositionally... this is what i did - learn some compositional idioms by heart - do you know the shape of the paradoxical combinator by heart - do you know the data making up a monad - do you know the data making up a distributive law between monads - use them in real world applications and see where they fail - when is calculating the least/greatest fixpoint of a recursive spec for a problem the suboptimal solution - when is a monad not the answer - when is an indexed form of composition inadequate - improve them - is it a situational improvement or - a fundamental improvement - see where the very programming model itself fails - is functional composition the only sort of composition - how is parallel composition like functional composition - is parallel composition easily represented in categorical composition - improve it - what is the view of the world in your notion of composition - play with new programming models - does your new notion of composition give rise to a whole generation of different models - invent new idioms in these models - what are the things these models naturally express - and teach them to someone who wishes to bootstrap thinking compositionally For myself, i was unhappy with the notion of name. The π-calculi and lambda calculi suffer a dependence on a notion of name. Both families of calculi require at least countably infinitely many names, and a notion of equality on names. If names have no internal structure then these theories *cannot be effective*. The reasons is that the notion of equality must then be realized as an infinitary table which cannot fit in any computer we have access to. Therefore, in effective theories, names must have internal structure. Since they have internal structure and are at least countably infinite, one is in danger of undermining the foundational character of these proposals for computing. Therefore, the only possible solution is that the notion of structured name must come from the notion of program proposed by the model. This argument is airtight. If you want a foundational model of computing with nominal structure, the nominal structure must derive from the notion of computation being put forward, i.e. it must *reflect* the notion of computation. This gives rise to all kinds of new an beautiful phenomena. One measure of your way into compositional thinking is whether this is happening. Is your approach to compositional thinking beginning to yield whole new aspects of computing, and new 'wholes' of computation, new forms of organization. Best wishes, --greg On Tue, Jun 16, 2009 at 7:31 PM, Jeremy Day jeremy@gmail.com wrote: Greg, On Tue, Jun 16, 2009 at 6:38 PM, Meredith Gregory lgreg.mered...@gmail.com wrote: It takes some serious training to think compositionally. No doubt it is extremely tough to think compositionally, and it's all too easy to fall back on non-compositional ways of thinking. In a similar vein it's all too easy to fall into procedural patterns when learning or working with functional programming in a multi-paradigm language. But what are good ways for programmers to learn to think compositionally and, more importantly, practice? Do you know of any books or online references that might help make the transition for anyone who is interested? Jeremy -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: scalajpa - while accessing two distincts databases, the second access is made with a connection to the first database
2009/6/17 Meredith Gregory lgreg.mered...@gmail.com Jeremy, Most excellent question award to you, sir! How to bootstrap thinking compositionally... this is what i did - learn some compositional idioms by heart - do you know the shape of the paradoxical combinator by heart - do you know the data making up a monad - do you know the data making up a distributive law between monads - use them in real world applications and see where they fail - when is calculating the least/greatest fixpoint of a recursive spec for a problem the suboptimal solution - when is a monad not the answer - when is an indexed form of composition inadequate - improve them - is it a situational improvement or - a fundamental improvement - see where the very programming model itself fails - is functional composition the only sort of composition - how is parallel composition like functional composition - is parallel composition easily represented in categorical composition - improve it - what is the view of the world in your notion of composition - play with new programming models - does your new notion of composition give rise to a whole generation of different models - invent new idioms in these models - what are the things these models naturally express - and teach them to someone who wishes to bootstrap thinking compositionally For myself, i was unhappy with the notion of name. The π-calculi and lambda calculi suffer a dependence on a notion of name. Both families of calculi require at least countably infinitely many names, and a notion of equality on names. If names have no internal structure then these theories *cannot be effective*. Do we need to do some sort of course to understand this language? The reasons is that the notion of equality must then be realized as an infinitary table which cannot fit in any computer we have access to. Therefore, in effective theories, names must have internal structure. Since they have internal structure and are at least countably infinite, one is in danger of undermining the foundational character of these proposals for computing. Therefore, the only possible solution is that the notion of structured name must come from the notion of program proposed by the model. This argument is airtight. If you want a foundational model of computing with nominal structure, the nominal structure must derive from the notion of computation being put forward, i.e. it must *reflect* the notion of computation. This gives rise to all kinds of new an beautiful phenomena. One measure of your way into compositional thinking is whether this is happening. Is your approach to compositional thinking beginning to yield whole new aspects of computing, and new 'wholes' of computation, new forms of organization. Best wishes, --greg On Tue, Jun 16, 2009 at 7:31 PM, Jeremy Day jeremy@gmail.com wrote: Greg, On Tue, Jun 16, 2009 at 6:38 PM, Meredith Gregory lgreg.mered...@gmail.com wrote: It takes some serious training to think compositionally. No doubt it is extremely tough to think compositionally, and it's all too easy to fall back on non-compositional ways of thinking. In a similar vein it's all too easy to fall into procedural patterns when learning or working with functional programming in a multi-paradigm language. But what are good ways for programmers to learn to think compositionally and, more importantly, practice? Do you know of any books or online references that might help make the transition for anyone who is interested? Jeremy -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
