Tried it myself and that version does not work. You probably need
nested for-comprehension which parses the JSON:
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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