Extended Grails command object constraints validation

Question

Having the following commandobjects in Grails:

class commandA implements commandObjectType {
    String a

    static constraints = {
        a blank: false
    }
}

and

class commandB extends commandA {
    String b
}

How would one the implement custom field validation on b in the commandB object? It is to my knowledge not possible to override or in other ways change a closure..

Can this be done in anyway? I have tried "shifting" in a closure, without succes.. Is it possible to specify validators in-line with the fields in any way?

Arturo Herrero · Accepted Answer · 2012-12-19 15:55:37Z

1

I'm not sure if sharing contraints works for command objects, but you can try something like this:

class commandB extends commandA {
    String b

    static constraints = {
        importFrom commandA
    }
}

See the Grails documentation about constraints usage.

answered Dec 19, 2012 at 15:55

Arturo Herrero

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1 Comment

Hoof Over a year ago

It might work in a situation, where there is no inheritance involved.

Sergei Shushkevich · Accepted Answer · 2012-12-19 13:26:02Z

0

Just define "constraints" block in commandB as usual with validation rules for "b" field. Validation should work for both "a" and "b" fields.

answered Dec 19, 2012 at 13:26

Sergei Shushkevich

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3 Comments

Hoof Over a year ago

No, that is not possible. Also, if you think about it in a minute - you cant have to closures of the same name. It throws MissingMethodException..

Ian Roberts Over a year ago

@Hoof you can have static properties of the same name in both the parent and the child class, there's no concept of one "overriding" the other when they're static.

Hoof Over a year ago

@Ian, OK, I did not know that. However, it doesn't change the fact, that it doesn't work.

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