[Zope-dev] RE: ZPatterns, ObjectDomain, UML and all that.....

2000-12-05 Thread RC Compaan 

Hi Steve

I'm also a babe in the woods when it comes to object modelling, but here's
my pennie's worth.  Since code generation was not really required in the
models I recently did for Zope Apps and the terrible exchange rate on the
South African Rand I decided to use to very light weight Playground
modelling tool.  I agree with Steve Alexander that Coad notation serves
ZPatterns *better* and this is exactly what Playground uses.

  If I explicitly store a Bar object as an Attribute of a DataSkin then
  what happens if the original Bar is removed from its Specialist's
  Rack? Does the Bar I store still refer to the original Rack as its
  DataManager? So.. does a Rack sometimes have 'clients' that are not
  really in the Rack at all? Or perhaps I misunderstood the discussion,
  and the Address wasn't really a DataSkin at all?  Also.. assuming
  that all works, do I have to do anything special, or carefully to be
  sure that the persistence machinery doesn't incur lots of expensive
  attribute fetching if I don't explicitly refer to those attributes,
  but have the DataSkin as a directly set attribute of another
  DataSkin?

Before I started building Apps with ZPatterns I built a object/relational
access layer in Delphi for my applications which enables me to create pure
objects in my problem domain and delegate all data management to the the
access layer.  I *think* this is one of the things ZPatterns wants to do as
well.

Take the Customer with Address property example:
I create Customer and Address Dataskins.  For Customer I have an external
method setAddress which sets the Address property of my Customer object and
this is how I would create a new Customer:
  newCustomer = customerRack.newItem( CustomerCounter )
  newAddress = addressRack.newItem( AddressCounter )
  newCustomer.setAddress( newAddress )

I prefer the simplicity this brings when I have to access the properties of
a Customer (without having to call a getter each time I need an address):
  myCustomer.Address.Street

This also maps quite simply to SQL storage.

So although instances of Address are properties of Customer they live on
their own Rack and instances of Customer simply refers to their Address
through assignment.

With Container/Content type objects I do roughly the same - I have
setContainer methods for the Content objects.

Roché



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[Zope] RE: How to Delete ZClass Instances programmatically??

2000-08-28 Thread RC Compaan 

Instead of directing your form to URL0 direct it back to your custom
interface.  In your form you can evaluate the value of submit to determine
the appropriate action:

 dtml-if "REQUEST['submit'] == 'Delete'"
dtml-call "manage_delObjects(ids)"

untested.

Roché

 -Original Message-
 From: Jean Jordaan [mailto:[EMAIL PROTECTED]]
 Sent: 28 August 2000 01:43
 To: '[EMAIL PROTECTED]'
 Cc: RC Compaan (E-mail)
 Subject: How to Delete ZClass Instances programmatically??


 Hi Zopers

 I've found the "How-To: Adding ZClass Instances Programmatically",
 but now I'm looking for the *Deleting ZClass Instances* one!

 I'm trying this as a beginning (hacked from the Zope management
 interface)::

 dtml-if "AUTHENTICATED_USER.has_role('ContentManager')"
   form action="dtml-var URL0" method="post"
 /dtml-if
   [...]
 dtml-if "AUTHENTICATED_USER.has_role('ContentManager')"
   input type="checkbox" name="ids:list" value="dtml-var id"
 /dtml-if
   [...]
 dtml-if "AUTHENTICATED_USER.has_role('ContentManager')"
   input type="submit" name="manage_delObjects:method" value="Delete"
   /form
 /dtml-if

 Problems:

  - it sends me to the management screen afterwards, and I'm
calling it from the public interface.

  - I don't necessarily want to give the 'ContentManager' rights
to delete objects; I'd rather manage this through a delete
method with the appropriate proxy role.

 Any advice or RTFM pointers?
 --
 Jean Jordaan   --technical writer--
 Mosaic Software--Zope 2.1.6 on WinNT and W2K



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RE: [Zope-dev] RE: [Zope] ZPatterns Question

2000-08-10 Thread RC Compaan 


 At 01:57 PM 8/8/00 +0200, RC Compaan wrote:
 I've added a propertysheet called "properties" to my ZClass and i notice
 there is Persistent Sheetprovider under the default rack already.  The
 Sheetprovider has properties Sheet_Names and Sheet_Namespaces.  I guess
 Sheet_Names should refer to the sheetname i created for my
 ZClass??? but how
 do Sheet_Namespaces come into play.

 Actually, neither relates.  Property sheets created on ZClasses
 always have
 their data stored in attributes of the object itself, so if you want to
 control those property sheets you would not use a sheet provider at all.
 Sheet providers are only used to provide property sheets whose data is
 stored external to the object.


Oh ok, this divide clears it up a bit.  I somehow imagined that an object's
properties are always stored inside the object and that Providers are the
managers of those properties.

 The Specialist does not talk to the sheet provider.  The Specialist asks
 its racks for an object.  The Rack which "retrieves" the object tells the
 object that it belongs to the rack and should ask the rack for anything it
 needs.  When the object needs a property sheet or attribute or
 whatever, it
 asks the rack to give it a list of relevant providers for that
 attribute/sheet/whatever.  It then walks the list asking those
 providers if
 they can perform the function it desires.  If none of the providers are
 successful, it performs a default behavior (such as raising an
 AttributeError to indicate the attribute does not exist).  This general
 pattern is followed for almost anything that can be delegated from a skin
 to a provider.

I considered the scenario where attributes are stored external to the object
according to the filing clerk analogy on the wiki:

The Specialist (filing clerk) asks its racks (filing cabinet) for an object
(dental records).  The rack (filing cabinet) tells the object (the dental
records) that it belongs to the rack AND that the object should ask the rack
for anything it needs.

Why would the object "need" anything.  Is it not the specialist with the
"need"?

If object data is stored external to the dataskin object does the dataskin
only implement behaviour?  I find it difficult to understand because I
associate Dataskin with Storage.  If object data is stored externally is it
stored in Persistent Property Sheets?  How does one define properties for
Persistent Property Sheets?

Roché


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[Zope] RE: About Squishdot and permissions

2000-08-08 Thread RC Compaan 

Check if the proxy role for index_html is set to manager.

roché

 -Original Message-
 From: Jean Jordaan [mailto:[EMAIL PROTECTED]]
 Sent: 08 August 2000 01:02
 To: RC Compaan (E-mail); '[EMAIL PROTECTED]'
 Subject: About Squishdot and permissions


 hi Zopers,

 In case this is very obvious (I'm RTFM'ing meantime) ..
 while hacking Squishdot's DTML, I did something to
 make 'leftbox_items' inaccessible to 'Anonymous':

   Unauthorized
   You are not authorized to access leftbox_items.

 in / , Anonymous has these permissions:

 Access contents information
 Add Comments
 Add Newss
 Add Postings
 Add ZWiki Pages
 Change ZWiki Pages
 Search ZCatalog
 Use Database Methods
 View

 any clue what's up?

 --
 jean (running Zope 2.1.6 and Squishdot-0-4-1)



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[Zope] ZPatterns Question

2000-08-07 Thread RC Compaan 

I created a ZClass called "Product" with Dataskin as baseclass.

I also added a specialist called ProductManager containing a default rack.
Under storage for the rack I selected the newly created Product ZClass.

My product ZClass needs to query both a RDBMS and the ZODB for
attributevalues.  At this point I get lost.
I guess i should add an attributeprovider plug-in???

What should go into the fromexpr and attrsexprs properties of the
attributeprovider?  Should one add an attributeprovider for each attribute
of the product?

Roché



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[Zope] Precondition

2000-08-04 Thread RC Compaan 

What does the "Precondition" property of the file class refer to?

Roché


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[Zope] RE: How to prime a selection?

2000-08-03 Thread RC Compaan 

Hi Jean

The value for a selection list can be any zope object that returns a list
eg. MyDocClass can have a property "Format" with a value "FormatList", where
FormatList is a dtml-method that returns a list.

Practically:
1.Go to the property sheet for your new class and add the property Format
with value FormatList.
2.Go to the Folder where you want to add an instance of your ZClass and
create add a property "docformats" of type "lines" and enter the initial
formats.
3.In the Folder where you want to add your instance, create a dtml-method
called "FormatList" that will return the list, containing:
dtml-return docformats

Hope this helps.

For more info on selection list see
http://www.zope.org/Members/AlexR/SelectionLists

Roché

 -Original Message-
 From: Jean Jordaan [mailto:[EMAIL PROTECTED]]
 Sent: 04 August 2000 07:10
 To: '[EMAIL PROTECTED]'
 Cc: RC Compaan (E-mail)
 Subject: How to prime a selection?


 Hi all

 I'm making a document class for a warehouse of papers.
 It's based on ZCatalogAware and ObjectManager (to wrap
 mainly PDFs and DOCs), and has fields:

   title   (string type)
   origin  (string type)
   format  No value for format_value.
   typeNo value for type_value.

 "format" and "type" are selections --

 1. where do I supply their initial values (filling in
'format_value' and 'type_value')?
 2. is it possible to let a field offer presets and
previously entered values, but to allow users to
add new ones, which are remembered and offered to
subsequent users?

 A RTFM-type answer to question 1. is perfectly OK, though a
 page reference would be sorely appreciated.

 --
 jean



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RE: [Zope] Zope Components and ZPatterns

2000-07-18 Thread RC Compaan 

Thanks Holger

I used the source distribution and it worked.  Why is this not part of the
binary distribution?

Roché

 -Original Message-
 From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
 Holger Hoffmann
 Sent: 17 July 2000 05:43
 To: RC Compaan
 Subject: Re: [Zope] Zope Components and ZPatterns


 Hi,

 RC Compaan wrote:
 
  In trying to install ZPatterns on linux the install fails
 during the "make"
  part of the install, complaining about a non-existant ExtensionClass.h,
  which should be in the Zope Components directory (also not existent).  I
 [snip]

 i think you need the source distribution of zope. There the
 file ExtensionClass.h exists in lib/Components/ExtensionClass.

 ... Holger



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RE: [Zope] Zope Components and ZPatterns

2000-07-18 Thread RC Compaan 

And no source is distributed with the binary distro?  It seems harless to
include the zope components into the binary distro.

Roché

 -Original Message-
 From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
 Bill Anderson
 Sent: 18 July 2000 10:40
 To: RC Compaan
 Cc: Zope
 Subject: Re: [Zope] Zope Components and ZPatterns


 RC Compaan wrote:
 
  Thanks Holger
 
  I used the source distribution and it worked.  Why is this not
 part of the
  binary distribution?


 Because it is source  :-)

 --
 Do not meddle in the affairs of sysadmins, for they are easy to annoy,
 and have the root password.



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[Zope] Zope Components and ZPatterns

2000-07-17 Thread RC Compaan 

In trying to install ZPatterns on linux the install fails during the "make"
part of the install, complaining about a non-existant ExtensionClass.h,
which should be in the Zope Components directory (also not existent).  I
noticed on the mailing list that one should do a rebuild if you install from
the source.  I ran the install script that comes with the source but still
no Components directory is created and no ExtensionClass.h is to be found.
Where do I go wrong?

Waiting for ZPattern-magic
Roché


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[Zope] Sorting a list

2000-07-08 Thread RC Compaan 

I have a list:
mylist=[('R',31),('I',80),('A',80),('S',23),('E',35),('C',21)]

I want to rebuild the list sorted from high to low on the sequence-item.

When i call  dtml-in mylist sort=sequence-item reverse the list gets
sorted on the sequence-key not the sequence-item.  As I understand the
alphabetical characters are the sequence-keys and the float values are the
sequence-items.

Where do misunderstand?

Roché


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RE: [Zope] ProxyPass

2000-06-25 Thread RC Compaan 

Thanks Pierre

This is a relief, I really didn't want to switch back to pcgi.  I have
worked a little bit with the rewritemodule but if anybody has an example on
how to do this it would really be helpfull.

Roché

 use the rewriterule module, with the [P] flag
 this is very powerfull (a little hard to use, but...) and u can
 do what u want
 with URLs
 (doc on Apache site), and u can use Apache as a proxy server much more
 powerfull (it looks like I like this word ;^) ).

 Pierre

  Is there anyway to get around the fact that the remote ip is
 the server's ip
  if you use Apache's ProxyPass directive to pass requests on to Zope?
 
  Roché
 
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[Zope] ProxyPass

2000-06-20 Thread RC Compaan 

Is there anyway to get around the fact that the remote ip is the server's ip
if you use Apache's ProxyPass directive to pass requests on to Zope?

Roché



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[Zope] PropertyIds

2000-06-19 Thread RC Compaan 

I have a very simple documentclass in very simple structure in method that
should return the properties of the document:

dtml-call "REQUEST.set('tid', REQUEST.cookies['careermanid'])"
dtml-with RESULTS  // RESULTS is a ZClass Object Manager
  dtml-call "REQUEST.set('tmp', _.getitem(_['tid']))"  // tmp is a
document with an id equal to the cookie
  dtml-return "tmp.propertyIds"
/dtml-with

During the application i add properties to the document and want to display
them with the above method.  The Property ids does not get shown though.
I've tried:
  dtml-with tmp
dtml-var propertyIds
  /dtml-with
and also:
  dtml-in "tmp.propertyIds"
dtml-return sequence-item
  /dtml-with
But no luck.
How can this work?

Roché


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RE: [Zope] PropertyIds

2000-06-19 Thread RC Compaan 

Thanks Rik it works.

I've noticed in some cases that one puts empty brackets at the end of
certain zope object methods.  Is that there for methods that can take
parameters?

Roché

 -Original Message-
 From: Rik Hoekstra [mailto:[EMAIL PROTECTED]]
 Sent: 19 June 2000 12:54
 To: RC Compaan
 Cc: Zope
 Subject: Re: [Zope] PropertyIds




 
  I have a very simple documentclass in very simple structure in
 method that
  should return the properties of the document:
 
  dtml-call "REQUEST.set('tid', REQUEST.cookies['careermanid'])"
  dtml-with RESULTS  // RESULTS is a ZClass Object Manager
dtml-call "REQUEST.set('tmp', _.getitem(_['tid']))"  // tmp is a
  document with an id equal to the cookie
dtml-return "tmp.propertyIds"

 this line should read:

 dtml-var "tmp.propertyIds()"

 Two things going wrong:

 1. the dtml-return tag is for DTML Methods that should just return
 something. You want dtml-var.
 2. you call propertyIds in an expression (the line is shorthand for
 dtml-var expr="tmp.propertyIds()" - in that case you have to call it
 as a function.

  /dtml-with
 
  During the application i add properties to the document and
 want to display
  them with the above method.  The Property ids does not get shown though.
  I've tried:
dtml-with tmp
  dtml-var propertyIds
/dtml-with

 this should get you a list, like ['title', 'prop1, ...]


  and also:
dtml-in "tmp.propertyIds"
  dtml-return sequence-item
/dtml-with

 this doesn't work for reasons outlined above.


 Rik



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RE: [Zope] PropertyIds

2000-06-19 Thread RC Compaan 

Very clear, thanks.  Really appreciated.

Well i guess the topic was never about propertyids, but i can only tell that
now.  Still working with properties i find the following trouble.

dtml-var "MyDoc.propertyItems()" returns a list of key-value pairs
[('Key1','Value1'},('Key2','Value2')]

to access the values of each key sequentially i tried:
dtml-in "MyDoc.propertyItems()"
  dtml-let s="_['sequence-item']" key=s[:1] value=[1:]
  dtml-var key:dtml-var valuebr
/dtml-in

But this just returns "k" and "ey" resulting in a slice of the keyname.

Roché

 Thanks Rik it works.

 I've noticed in some cases that one puts empty brackets at the end of
 certain zope object methods.  Is that there for methods that can take
 parameters?


 [rh]Um, not quite, it has to do with the way of calling the object methods
 in question. DTML has two ways of calling: by name and through
 expressions.

 1. The 'normal' Zope way of writing things is dtml-var
 objectValues. This
 is shorthand for dtml-var name="objectValues".

 2. The other way is dtml-var "objectValues". This is shorthand for
 dtml-var expr="objectValues". Everything inside the expression
 is treated
 as a python expression. If you call it without the brackets, you're just
 referencing the method. If you try that in a DTML Method and look in the
 source of the diplayed document you'll see something like
 Python Method object at 13fcbf0. If you want to _call_ the
 method, you'll
 have to add the brackets (with or without arguments).

 Hope this is clear.



 Rik



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[Zope] Expressing expressions

2000-06-19 Thread RC Compaan 

Simple addition seems a bit tricky in zope

  dtml-call "REQUEST.set('CategoryTotal',0)"

  dtml-in "tmp.propertyItems()"
 dtml-let key="_['sequence-key']"
   value="_['sequence-item']"
   category="s[:1]"
   counter="_.getitem(category+'Total')"  --// Here i want to
concatenate the category from the value with the word total so that i can
lookup my declared variable in the namespace.
 dtml-var expr="counter=counter+value"  --// Here i tried to
increase the declared variable with the value.
 /dtml-let
  /dtml-in

Can someone help?

Roché


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