Aha!
Thanks,
Sent from my iPhone
On Jan 4, 2010, at 16:45, Ross Mellgren <dri...@gmail.com> wrote:
>
> I can answer b) -- S.param("image").flatMap(asLong)
>
> asLong comes from BasicTypesHelpers.
>
> -Ross
>
> On Jan 4, 2010, at 4:42 PM, Jim Wise wrote:
>
>>
>> So, in my endless retweaking of this code, getting better (and
>> learning
>> more lift) on each pass, I've got a rewrite rule like this
>>
>> case RewriteRequest(ParsePath("image" :: image :: Nil, _, _,
>> _), _, _) =>
>> RewriteResponse("viewImage" :: Nil, Map("image" -> image))
>>
>> which is (eventually) handled by a snippet like this:
>>
>> def doShowOne(in: NodeSeq): NodeSeq =
>> S.param("image").map(_.toLong) match {
>> case Full(selected) =>
>> ImageInfo.findByKey(selected) match {
>> case Full(i) =>
>> bind(...)
>> case _ =>
>> S.error("No such image!")
>> }
>> case _ =>
>> S.redirectTo("/images")
>> }
>>
>> Which works well if the referenced path component is the id of an
>> existing image, or of a nonexistent image -- and throws an exception
>> if
>> the last path component can't be parsed as a long.
>>
>> I can catch the exception, of course, but I kinda feel there must
>> be a
>> cleaner way to do this -- either by not matching in the rewriting PF
>> if
>> the positional paramter "image" is not parseable as a long, or by
>> making
>> this another layer of casing in the snippet.
>>
>> So, two questions:
>>
>> a.) is there an idiom for this?
>>
>> b.) is there a good way to test if a String (or better, a Box
>> [String])
>> is convertable toLong without a try/catch?
>>
>> Thanks again,
>> --
>> Jim Wise
>> jw...@draga.com
>
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