On Thu, Mar 4, 2010 at 12:52 PM, Joni Freeman <freeman.j...@gmail.com>wrote:
> Tried it myself and that version does not work. You probably need
> nested for-comprehension which parses the JSON:
>
>
I added:
implicit def iterableToBox[X](in: Iterable[X]): Box[X] = in.headOption
And it makes things hunky dory.
Thanks for your help!
> for {
> user <- WorkerMgr.find(UserId(user)) ?~ "User not found"
> json <- r.json
> data <- Box(for {
> JField("messageId", JInt(messageId)) <- json
> JField("timestamp", JInt(timemillis)) <- json
> } yield (messageId, timemillis))
> } yield ...
>
> Cheers Joni
>
> On Mar 4, 9:55 pm, Joni Freeman <freeman.j...@gmail.com> wrote:
> > Hi David,
> >
> > Does this work?
> >
> > for {
> > user <- WorkerMgr.find(UserId(user)) ?~ "User not found"
> > json <- r.json
> > JField("messageId", JInt(messageId)) <- json
> > JField("timestamp", JInt(timemillis)) <- json
> > } yield ..
> >
> > Cheers Joni
> >
> > On Mar 4, 9:28 pm, David Pollak <feeder.of.the.be...@gmail.com> wrote:
> >
> > > Folks,
> >
> > > I'm working on parsing through some JSON that's posted/put as part of a
> > > request. I'd like to find the messageId field and only get it if its
> type
> > > is JInt. I'm doing this within a for comprehension that has a Box at
> the
> > > top of it, so the resulting expression must play well with Box. What
> I've
> > > got is:
> >
> > > for {
> > > user <- WorkerMgr.find(UserId(user)) ?~ "User not found"
> > > json <- r.json
> > > (_, messageJson) <- (json \ classOf[JField]).find(_._1 ==
> > > "messageId")
> > > messageId <- Box.asA[JInt](messageJson)
> > > (_, timemillisJson) <- (json \ classOf[JField]).find(_._1 ==
> > > "timestamp")
> > > timemillis <- Box.asA[JInt](timemillisJson)
> > > } yield ...
> >
> > > The lines that look for messageId and timestamp and insure they are
> JInts
> > > are kinda verbose. Is there a better way to do what I'm trying to do?
> >
> > > Thanks,
> >
> > > David
> >
> > > --
> > > Lift, the simply functional web frameworkhttp://liftweb.net
> > > Beginning Scalahttp://www.apress.com/book/view/1430219890
> > > Follow me:http://twitter.com/dpp
> > > Surf the harmonics
> >
> >
>
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--
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
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