Howdy,
Lift does rendering most basically with Snippets. Snippets are functions
NodeSeq => NodeSeq... they take a NodeSeq and return a NodeSeq. Snippets
are generally independent entities. They do not know about each other.
They can ask about the state of the session and the state of the request.
We introduced RequestVar (and SessionVar) to give developers a type-safe way
to share information during the scope of a request (RequestVar) and session
(SessionVar).
RequestVars are strongly typed. That means if you define a RequestVar to
hold a String, the compiler will not allow you to put a List into it.
Behind the scenes, RequestVars use a shared Map[String, Any] to store the
information. The String is the "name" of the RequestVar and the Any is the
thing that you are putting into the slot for the Var.
So, we use a little "magic" to generate the unique but stable name of the
Var. Specifically, we look at the class name that the compiler selected for
the object that extends RequestVar. If the object is defined within a
class, the class name for the RequestVar will depend on that class name.
When you have an object that extends a class, the Scala compiler may
generate a new class and thus your "currentClient" RequestVar in the
ViewClient class and the ViewClient object are different RequestVars. They
point to different things.
The easiest way to deal with this is to make your currentClient a top-level
object. If you want to scope the currentClient RequestVar someplace, I'd
suggest:
object ViewClient extends ViewClient {
object currentClient extends RequestVar...
}
So, please try putting the currentClient someplace where there's a single
path (from a class perspective) to it and I'm guessing that your issue will
go away.
Thanks,
David
On Mon, Mar 8, 2010 at 10:13 PM, hexa <hex...@gmail.com> wrote:
> Hi,
> I have a RequestVar that I send to a snippet which will then do a
> post...
>
> But I would like the RequestVar to persist between the moment it it
> received in the post snippet and the post itself...
>
> The only way I found of doing it right now is like :
>
> Source Snippet :
>
> object ViewClient extends ViewClient
>
> class ViewClient
> {
> object currentClient extends RequestVar [Box [Client]] (Empty)
>
> bind (...
> "addInvoice" -> SHtml.link ("/invoice/create", () => currentClient
> (Full (c)), Text ("Ajouter Facture")))
>
>
> Destination Post Snippet :
>
> def add (inhtml: NodeSeq) : NodeSeq = {
>
> val inInvoice = Invoice.create
> val clientBox = ViewClient.currentClient
>
> val client_id = clientBox map (_.id.toLong)
>
> def processEntry () {
> Client.findByKey (client_id openOr 0) map (inInvoice.client (_))
> inInvoice.save
> S.notice ("Entre : Description " + inInvoice.description + "
> Montant : " + inInvoice.amount)
> }
>
> bind ("e", inhtml,
> "description" -> inInvoice.description.toForm,
> "amount" -> inInvoice.amount.toForm,
> "submit" -> SHtml.submit ("Ajouter Facture", processEntry))
>
> If I try to access the clientBox in processEntry, even with the
> closure it should generate.. I get an empty box...
>
> Is there any way to copy / ref or anything or make a new RequestVar
> with a copy of the preceding one ?
>
> Would have been nice not to be obligated to do the client_id toLong
> code...
> And juste do inInvoice.client (client) , inInvoice.save
>
>
> Thanks a lot
>
> hexa
>
> --
> You received this message because you are subscribed to the Google Groups
> "Lift" group.
> To post to this group, send email to lift...@googlegroups.com.
> To unsubscribe from this group, send email to
> liftweb+unsubscr...@googlegroups.com<liftweb%2bunsubscr...@googlegroups.com>
> .
> For more options, visit this group at
> http://groups.google.com/group/liftweb?hl=en.
>
>
--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
Surf the harmonics
--
You received this message because you are subscribed to the Google Groups
"Lift" group.
To post to this group, send email to lift...@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.
