Grails: Dynamically change domain's constraints in controller

Question

I'm a Grails beginner. I have a Domain class which has domainName field in Grails (ver. 2.0.1). In my DomainConstraints.groovy, I have:

constraints = {
    domainName blank: false, matches: "^([^.]{0,63}\\.)*([^.]{1,63})\$"
}

but depending on some situation, i want to make this domainName field "blank: true" or "blank: false". I'm not validating my domain class against the actual database, so sync with the domain class and the actual table is not an issue.

So, I want to do something like this (code below is from my imagination):

if(something){
   Domain.constraints.removeAttr('blank')
} else {
   Domain.constraints.addAttr('blank', 'true')
}

Is this possible?

see http://stackoverflow.com/questions/4725059/grails-custom-validator-for-domain-class — calebds, Mar 03 '12 at 01:06

chrislatimer · Answer 1 · 2012-03-03T19:47:46.620

2

You could do something like this:

class DomainConstraints {
  Boolean validateBlankFlag
  String domainName
  static transients = [validateBlankFlag]

  static constraints = {
    domainName validator :  { val,obj -> !val?.equals("") || !obj.validateBlankFlag}

  }
}

Then just set the validateBlankFlag on the domain object depending on whether you want to allow blank values or not. You may not even need the validateBlankFlag property if you can make the decision based on other property values within the DomainConstraints object.

edited Mar 03 '12 at 19:47

answered Mar 03 '12 at 19:42

chrislatimer

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19

@cweston the code above shows `validateBlankFlag` in the transients array. – chrislatimer Nov 28 '14 at 20:30

Grails: Dynamically change domain's constraints in controller

1 Answers1