CODEWITHSUNDEEP
formsvalidationscalaplayframeworkconstraints
Maximilian Wiens
Maximilian Wiens

Reputation: 323

Verifying two form fields by comparing them in an constraint

I'm currently fighting with Scala constraints. I have a case class to bind the form to and a mapping function.

But i don't know how to verify two fields by comparing them (the first should be greater than the second)

Currently I'm thinking it should be done like this:

models/JobRequest.scala

package models

case class AddJobRequest (
    exrange: Boolean, 
    exrangefrom: Int,
    exrangeto: Int
)

controllers/Index.scala

package controllers

/* Code code code */

val jobAddForm = Form(
mapping(
  "exrange" -> boolean,
   tuple(
    "exrangefrom" -> number(min = 7, max=19),
    "exrangeto" -> number(min  = 8, max = 20)
   ).verifying("Start number is greater than the stop number!", /** MAGIC GOES HERE */)
  )(AddJobRequest.apply)(AddJobRequest.unapply))

Is there are a possibility to check, if exrangefrom is greater than exrangeto? Or is that a completely bad way to check that using ad-hoc constraints?

Upvotes: 2

Views: 960

Answers (1)

Zarkus13
Zarkus13

Reputation: 302

You can use verifying on the mapping(...) object ! In your case, comparing exrangefrom and exrangeto could be done this way :

package controllers

/* Code code code */

val jobAddForm = Form(
  mapping(
    "exrange" -> boolean,
    "exrangefrom" -> number(min = 7, max=19),
    "exrangeto" -> number(min  = 8, max = 20)
  )(AddJobRequest.apply)(AddJobRequest.unapply)
  verifying(
    "Start number is greater than the stop number!",
    addJobRequest => addJobRequest.exrangefrom < addJobRequest.exrangeto
  )
)

Hope it's what you expected ;)

Upvotes: 3

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