How to add constraints on inherited properties in a grails domain sub-class

Question

Here\'s what I\'d like to do:

class A {
  String string
  static constraints = {
    string(maxSize:100)
  }
}

class B extends A {
  static constraints = {
         


        

Answer 1

Basically I do not see how it can be done.

Design wise a domain class actually maps the structure of the database table. The constraints will actually generate DB constraints. So your are trying to make several objects that will generate different constraints on the same table.

I think the better approach would be to create one domain object that has the simplest subset of constraints and then use different command objects to fine tune the exact constraints you want to be passed to the domain.

You could also use the validator: in the constraints to fine tune different constraints for different objects types (something like a types column in the domain and based on different types do different validation).