CODEWITHSUNDEEP
grailscustom-validators
user618118
user618118

Reputation: 31

Grails: Custom validator based on a previous value of the field

I am trying to create a custom validator for variable 'amount' in my domain class, such that the new value should be greater than previous by 0.50.

For example, lets say the previous value was 1.0, next time the value should be atleast: [previous value + 0.50] or more.

Thanks in advance for the help

Upvotes: 3

Views: 2775

Answers (2)

Julius Prayogo
Julius Prayogo

Reputation: 115

Thx Victor Sergienko, but I do a little modification on your code

class Bid { 
  Double amount 
  ...
  static constraints = { amount(validator: { double a, Bid b -> 
    Bid tempBid = Bid.get(b.id)
    def oldValue = tempBid.getPersistentValue('amount')
    a > oldValue + 0.5 ? true : "Amount $a should be at least ${oldValue  + 0.5}" }) 
  }
}

The difference is at this line : 

Bid tempBid = Bid.get(b.id)
def oldValue = tempBid.getPersistentValue('amount')

I don't why b.getPersistentValue('amount') is always return null value, my grails version is 2.4.3

Upvotes: 0

Victor Sergienko
Victor Sergienko

Reputation: 13475

You can try reading domainEntity.getPersistentValue('amount').

EDIT: ... in custom validator, like: 

class Bid { 
  Double amount 
  ...
  static constraints = { amount(validator: { double a, Bid b -> 
    def oldValue = b.getPersistentValue('amount')
    a > oldValue + 0.5 ? true : "Amount $a should be at least ${oldValue  + 0.5}" }) 
  }
}

Upvotes: 4

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