Grails change database column size of a hasMany of Strings

Question

I have a domain class that looks like the following:

class Foo {
    static hasMany = [bar: String]
}

The problem is that this creates a join table with a column of VARCHAR(255) in MySQL, which much larger than I need it to be. In my example, bar is a Set not an indexed collection, so trying to use indexColumn does not work. joinTable does not have an attribute to change the column type/length. Is it possible to change to column size without changing the structure of the domain class?

Answer 1

This works (tested with grails 2.4):

class Foo {
    static hasMany = [
        bars:String
    ]

    static mapping = {
        bars joinTable: [column: 'BARS_STRING', length: 112]
    }
}