Hi Peter,
To select multiple packets you need to first select the objects within
the array. Like this:
for {
JObject(packet) <- parse(s)
JField("node", JString(node)) <- packet
JField("dt", JInt(dt)) <- packet
JField("temp", JDouble(temp)) <- packet
} yield // construct Packet here
Cheers Joni
On Oct 5, 2:13 am, Peter Robinett <pe...@bubblefoundry.com> wrote:
> Thanks, Joni.
>
> I've been playing with just that for comprehension syntax over the
> weekend. How would I do it if I had multiple packets?
> {
> "packets": [
> {
> "node": "00:1D:C9:00:04:9F",
> "dt": 1254553581405,
> "temp": 27.5
> },
> {
> "node": "00:1D:C9:00:04:9E",
> "dt": 1254553582405,
> "temp": 24.3
> }
> ]
>
> }
>
> I've had some problems iterating across the parsed results. If I do:
> for {
> json <- parse(s)
> JField("node", JString(node)) <- json
> JField("dt", JInt(dt)) <- json
> JField("temp", JDouble(temp)) <- json
>
> } yield .... // construct Packet here
>
> I will end up with 8 Packets. Should I be doing something like JArray
> (json) <- parse(s)?
>
> Thanks for your help,
> Peter
>
> On Oct 4, 3:08 pm, Joni Freeman <freeman.j...@gmail.com> wrote:
>
> > > I don't know how hard would it be to add this feature, so I don't know
> > > if this is a reasonable request. This would make making JSON API
> > > endpoints really easy for me and I hope for other people too.
>
> > This certainly sounds like a reasonable feature request, I will take a
> > deeper look at it.
>
> > Meanwhile, you can use tmp case class as Kevin noted, or use for-
> > comprehension to query the json. Something like:
>
> > {
> > "packet": {
> > "node": "00:1D:C9:00:04:9F",
> > "dt": 1254553581405,
> > "temp": 27.5
> > }
>
> > }
>
> > val json = parse(s)
> > for {
> > JField("node", JString(node)) <- json
> > JField("dt", JInt(dt)) <- json
> > JField("temp", JDouble(temp)) <- json
>
> > } yield .... // construct Packet here
>
> > That's a bit verbose but quite flexible. This test case contains more
> > query
> > examples:http://github.com/dpp/liftweb/blob/master/lift-json/src/test/scala/ne...
>
> > Cheers Joni
>
>
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