[Lift] dealing with http parameters

[Lukasz Kuczera]

Hi Folks. How do you deal with something like:

val price:BigDecimal = try { S.param("price").map(BigDecimal(_))
openOr -1 }
catch { case e: NumberFormatException => -1 }

val tax = try { S.param("tax").map(_.toInt) openOr -1 }
catch { case e: NumberFormatException => -1 }

I would like to get rid of those nasty exceptions.

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[Marius]

You could try MetaRecord.fromReq .. it will populate your Record based
on the request parameters. You could also apply validators etc.

or something like:

val price:BigDecimal = tryo { S.param("price").map(BigDecimal(_)) }
openOr -1

Marius

[David Pollak]

You might also want to take a look at Helpers.asInt, asLong, etc.

And for you extractor fans in the audience:

case "api" :: "thing" :: Helpers.AsInt(id) :: _ => ...

Thanks,

David

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Beginning Scala http://www.apress.com/book/view/1430219890
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Surf the harmonics

[Marius]

The extractors are wicked cool ;)

On Apr 25, 3:46 pm, David Pollak <feeder.of.the.be...@gmail.com>
wrote:

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[Lukasz Kuczera]

Thanks Guys, will tryo your stuff ;)

[Timothy Perrett]

Yeah this is pretty sweet!