On Fri, Nov 20, 2009 at 8:33 AM, Alex Black <a...@alexblack.ca> wrote:
> On Nov 20, 11:30 am, David Pollak <feeder.of.the.be...@gmail.com>
> wrote:
> > On Fri, Nov 20, 2009 at 8:17 AM, Alex Black <a...@alexblack.ca> wrote:
> > We made this change for Lift 1.1. So, if you're using 1.1, the same
> > instance of a snippet should be used for a given HTTP request.
>
> Very cool. I'm looking forward to using 1.1 - on that note, is it
> released?
We've been releasing milestones on a monthly basis. There's also a SNAPSHOT
release that is generally very stable (except for the last few days, but
that's a significant anomaly).
> or is there a eta?
January.
> is it going to be released on Scala 2.8
> whenever that is ready?
>
We're trying to figure out 2.7.x and 2.8.x or just 2.8.x.
>
> > > I'd imagine lift could even generate a requestVar representing each
> > > snippet for the developers, allowing snippets in a given HTTP request
> > > to access each other easily.
> >
> > I don't think this is technically possible within the bounds of the type
> > system.
> >
> >
> >
> >
> >
> > > On Nov 20, 11:09 am, Ross Mellgren <dri...@gmail.com> wrote:
> > > > RequestVar is the standard way of doing this. For example
> >
> > > > object MySharedInformation {
> > > > object myData extends RequestVar[List[Thing]](loadThings)
> > > > // ^^^^^^^^^^^ ^^^^^^^^^^
> > > > // Type of thing to store How to initialize
> > > > variable first time it's accessed
> >
> > > > private def loadThings: List[Thing] = ...
> >
> > > > }
> >
> > > > class Snippet1 {
> > > > import MySharedInformation.myData
> > > > def render(ns: NodeSeq): NodeSeq = {
> > > > myData.is.map(thing => { ... })
> > > > }
> >
> > > > }
> >
> > > > class Snippet2 {
> > > > import MySharedInformation.myData
> > > > ...
> >
> > > > }
> >
> > > > The lifetime of the value is during the current request processing
> and
> > > > any AJAX calls related to it.
> >
> > > > If you really want to initialize it in a snippet, then use a Box with
> > > > a RequestVar, like this:
> >
> > > > object MySharedInformation {
> > > > object myData extends RequestVar[Box[List[Thing]]](Empty)
> >
> > > > }
> >
> > > > class LoaderSnippet {
> > > > import MySharedInformation.myData
> > > > def render(ns: NodeSeq): NodeSeq = {
> > > > myData.set(Full(...))
> > > > }
> >
> > > > }
> >
> > > > class ReaderSnippet {
> > > > import MySharedInformation.myData
> > > > def render(ns: NodeSeq): NodeSeq = {
> > > > // If the data has not been loaded, default to an empty list
> > > > val data = myData.is.openOr(Nil)
> > > > ...
> > > > }
> >
> > > > }
> >
> > > > class OtherReaderSnippet {
> > > > import MySharedInformation.myData
> > > > def render(ns: NodeSeq): NodeSeq = {
> > > > // Do two entirely different things if the data has versus
> > > > has not been loaded
> > > > myData.is match {
> > > > case Full(data) => // do something when the data has
> been
> > > > loaded
> > > > case _ => // do something when the data has not been
> loaded
> > > > }
> > > > }
> >
> > > > }
> >
> > > > HTH,
> > > > -Ross
> >
> > > > On Nov 20, 2009, at 10:59 AM, Alex Black wrote:
> >
> > > > > I've got a template page, say foobar.html, that makes a number of
> > > > > calls to functions in a snippet, e.g. mysnippet.foo1,
> mysnippet.foo2,
> > > > > mysnippet.foo3.
> >
> > > > > I'd like to do some initial work in foo1, e.g. retrieve some data
> and
> > > > > do some work on it, then in foo2 and foo3 display parts of that
> data.
> >
> > > > > Whats the easiest way to do this? I think I misunderstood the lift
> > > > > book:
> >
> > > > > "That means that for each request, Lift creates a new instance of
> the
> > > > > snippet class to execute. Any changes you make to instance
> variables
> > > > > will be discarded after the request is processed."
> >
> > > > > I thought this meant that for a given HTTP request, there would be
> one
> > > > > (and only one) instance of my snippet, so I could call several of
> its
> > > > > methods and they could all access the snippet's member variables,
> > > > > which would then be discarded at the end of the request.
> >
> > > > > Am I going about this wrong? should I only have one snippet
> function
> > > > > per template?
> >
> > > > > Thx
> >
> > > > > - Alex
> >
> > > > > --
> >
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> > --
> > Lift, the simply functional web frameworkhttp://liftweb.net
> > Beginning Scalahttp://www.apress.com/book/view/1430219890
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--
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