nullable: false in Grails Domain Class constraints

Question

I am having code

static constraints = {
    stringValiable1(nullable: false)
    stringValiable2(nullable: false)
    stringValiable3(nullable: false)
}

Is there a method where I can abstract out the (nullable: false) so that I avoid using it again and again. Also can it be done at package level so that I can use it throughout the other classes as well.

Answer 1

What you're trying to factor out is simply a Map . For example, the method call stringValiable1(nullable: false) is syntatic sugar for stringValiable1([nullable: false]) .

So, factoring it out is a matter of putting a Map in some class, and then using it:

Place to store Map

package foo.bar

class MyConstraints {
    static nullable = [nullable: true]
    static blank = [blank: true]
}

The domain class

static import foo.bar.MyConstraints.*

class SomeDomainClass {
    ...
    static constraints = {
        stringVariable1(nullable)
        stringVariable2(nullable + blank)
    }
}