CODEWITHSUNDEEP
scalaplayframework-2.0playframework-2.3
Chris Stewart
Chris Stewart

Reputation: 1679

Scala Play Forms verify that one date occurs after another

My form has two dates, but I want to validate that the second date occurs after the first date. Is there a concise way to do this using Play's Form verification?

Here is the form I am working with: 

  val policyForm: Form[PolicyForm] = Form(mapping(
    "amount" -> of[Double].verifying("You need to enter in the amount of bitcoins", _ > 0),
    "beginDate" -> date("yyyy-MM-dd").verifying("You cannot have a start date before today", dayLater _ ),
    "endDate" -> date("yyyy-MM-dd").verifying("End date has be after the start date", { d => 
      ???


    })
    )(PolicyForm.apply _)(PolicyForm.unapply _))

Upvotes: 1

Views: 195

Answers (1)

Michael Zajac
Michael Zajac

Reputation: 55569

You can't reference other form fields within the same mapping until after they all successfully bind individually. That is, the constraint must be made on the outer mapping.

val policyForm: Form[PolicyForm] = Form {
  mapping(
    "amount" -> of[Double].verifying(...),
    "beginDate" -> date("yyyy-MM-dd").verifying(...),
    "endDate" -> date("yyyy-MM-dd")
  )(PolicyForm.apply _)(PolicyForm.unapply _).verifying("End date has be after the start date", policyForm =>
     policyForm.beginDate.before(policyForm.endDate)
  )
}

This assumes java.util.Date, so replace with your own logic if you're using joda time, or something else.

Upvotes: 1

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