Well, if that's the case then you could do it something like this:
object MySnippet {
/** Function that binds fields of a single ModelObj */
def bindModelObj(ns: NodeSeq)(model: ModelObj) =
bind("model", ns, "field1" -> model.field1, "field2" ->
model.field2)
}
class MySnippet extends DispatchSnippet {
import MySnippet.bindModelObj
val dispatch: DispatchIt = {
case "forEach" => forEach
case "justOne" => justOne
}
def forEach(ns: NodeSeq): NodeSeq =
somehowGetAListOfModelObjects().flatMap(bindModelObj(ns) _)
def justOne(ns: NodeSeq): NodeSeq =
bindModelObj(ns)(somehowGetJustOneModelObject())
}
And then in your snippet you can also have reuse (I don't know how
efficient this is):
<lift:MySnippet.forEach>
<model:field1 />
<model:field2 />
</lift:MySnippet.forEach>
<lift:MySnippet.justOne>
<model:field1 />
<model:field2 />
</lift:MySnippet.justOne>
If you have the same rendering for each object, you could use
eager_eval and embed:
<lift:MySnippet.forEach eager_eval="true">
<lift:embed what="modelobject" />
</lift:MySnippet.forEach>
<lift:MySnippet.justOne eager_eval="true">
<lift:embed what="modelobject" />
</lift:MySnippet.justOne>
-Ross
On Dec 23, 2009, at 1:51 PM, Erkki Lindpere wrote:
> Well, I'd prefer to keep different concerns separated. Iterating over
> that list is not the only case where I render those objects, that's
> why I want the rendering of these objects to be separated into their
> own template.
>
> But maybe I'll change my mind. Doing it like you suggested is probably
> faster too.
>
> Erkki L
>
> On Dec 23, 8:31 pm, Ross Mellgren <[email protected]> wrote:
>> S.session.get.processSurroundAndInclude has a couple issues, first is
>> that it seems to be a much larger stick than you need, and the other
>> reason is that you are using "get" (which is for Option, I presume
>> you
>> mean open_!, since S.session is a box) which is not safe -- it will
>> throw NPE in the case where a session is not available.
>>
>> I think the more idiomatic way is probably more like
>>
>> def forEachMsg(in: NodeSeq): NodeSeq = {
>> val msgs = somehowGetAListOfModelObjects()
>> msgs.flatMap { msg =>
>> bind("msg", in, "field1" -> msg.field1, "field2" ->
>> msg.field2);
>> }
>>
>> }
>>
>> And then inline at the call side:
>>
>> <lift:blabla.forEachMsg>
>> <msg:field1 />
>> <msg:field2 />
>> </lift:blabla.forEachMsg>
>>
>> Is there something peculiar about your use case where you really want
>> to do lift:embed and so on?
>>
>> -Ross
>>
>> On Dec 23, 2009, at 1:26 PM, Erkki Lindpere wrote:
>>
>>> This has probably come up previously, but I couldn't find anything
>>> even though I think a couple of days ago I read about something
>>> similar:
>>
>>> I want to do a snippet that behaves similarly to JSTL-s forEach tag.
>>> Not exactly the same, but the idea is that it gets some list of
>>> model
>>> objects, then goes through it element by element and processes the
>>> input NodeSeq for each element. What I came up with is this:
>>
>>> def foreach(in: NodeSeq) = {
>>> val msgs = somehowGetAListOfModelObjects();
>>> msgs.flatMap { msg =>
>>> // set the current object (CurrentMessage is a ThreadLocal)
>>> CurrentMessage.set(msg)
>>> // process the contents, with the current object in scope
>>> S.session.get.processSurroundAndInclude("", in)
>>> }
>>> }
>>
>>> And it's called like this:
>>> <lift:blabla.foreach>
>>> <lift:embed what="message.html" />
>>> </lift:blabla.foreach>
>>
>>> Is there a more correct solution to this?
>>
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