On Wed, Jul 1, 2009 at 7:39 PM, Peter Robinett <pe...@bubblefoundry.com>wrote:
>
> Thanks, Naftoli. For now open_! does the trick for me.
Please do not use open_! The ! is there for a reason... it means use this
at your peril.
Either use openOr and have the expression on the right side of the openOr
return the same type as the expression on the left (Loc[Node]) or
alternatively, do pattern matching:
thing match {
case Full(x) => // do something
case _ => // some fallback
}
Using open_! is super duper dangerous and generally very, very bad practice.
>
>
> Peter
>
> On Jul 1, 5:55 pm, Naftoli Gugenhem <naftoli...@gmail.com> wrote:
> > If you know the Box is full you can write open_! (you'll get a runtime
> error if it wasn't). Otherwise openOr a default, e.g., an invalid id.
> > You have first answer the question, what _should_ happen if it's Empty
> after all? :)
> > -------------------------------------
> >
> > Peter Robinett<pe...@bubblefoundry.com> wrote:
> >
> > Everyone, I apologize for monopolizing the list but this has been very
> > helpful for me. I've learned a bunch from similar, old entries in the
> > list and hope this thread will help future Lift beginners.
> >
> > On to my reply to David:
> >
> > On Jul 1, 4:19 pm, David Pollak <feeder.of.the.be...@gmail.com> wrote:
> >
> > > Yes, the reference contained a Loc, but the compiler could not verify
> that
> > > it contained a Loc. At compile time, the compiler knows the common
> > > superclass between Loc[_] and String is Object. Thus the type of l in
> your
> > > code was Object and Object doesn't have the foundParam method.
> >
> > Ooooohhhh! Ok, that makes a lot of sense.
> >
> > > I'd put your snippet in your Loc. That way you have access to the
> > > foundParam.
> >
> > > Loc.Snippet("time", time)
> >
> > > And then in your Loc, you put the time method below. In that case,
> you'll
> > > have direct access to foundParam without any goofiness.
> >
> > To be honest, this doesn't make a lot of sense to me. I assume you
> > mean a Loc in the Menus of my SiteMap that I assemble in Boot.scala.
> > I'm using the Locs created by the CRUDify trait added to my Node model
> > so I guess I would have to override the Node.menus method. I think
> > I'll delve into this more later when it's necessary...
> >
> > > You could also write this as:
> >
> > > override val data = Packet.findAll(By(Packet.node, for (req <-
> S.request;
> > > loc <- req.location) yield loc.asInstanceOf[Loc[Node]].foundParam.is),
> > > MaxRows(1000)....
> >
> > Ok, this makes sense but unfortunately the value yielded by the for
> > comprehension is all boxed up and so I get an error:
> > error: no implicit argument matching parameter type
> > (net.liftweb.util.Box[net.liftweb.util.Box
> > [com.equalnetworks.model.Node]]) => Long was found.
> > override val data = Packet.findAll(By(Packet.node, for
> (req <-
> > S.request;
> >
> > What would be the best way to unbox things to get the actual Node
> > object so I can have a Long to put in my By() call?
> >
> > Thanks,
> > Peter
> >
>
--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
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