Question

Following grails domain class:

class MyClass {
  Map myMap
}

Now for myMap, grails automatically creates a new table for the elements in the map. However if I add elements which are too long (e.g. 1024 characters), I get a DB error.

Can I somehow tell grails to make the respective column in myMap’s table big enough to allow for larger Strings, or do I have to do this manually in the DB?

I already tried

static constraints = {
  myMap(maxSize:1024)
}

which doesn’t work (as expected because maxSize should refer to the Map’s values and not to the Map itself).

If not via constraints, maybe there’s a way to do it via

static mapping { ... }

?

Answer 1

An alternative approach I used successfully was to push the map out into a collection of a collaborator domain class.

class DynaProperty {
    String name
    String value

    static belongsTo = MyClass
    static constraints = {
        value(maxSize:4000)  //Or whatever number is appropriate
    }
}

And then in MyClass:

class MyClass {
    static hasMany = [dynaProperties:DynaProperty]
}

This is almost a map, and it gives you the ability to use dynamic finders to pull up an individual entry.