Add conditionals to joinTable column mapping

[neilabdev]

Thanks for the great work! Just a hope for a future enhancement. But basically, it would be nice to be able to add conditions to a joinTable, based on instance values or hard coded values on column names. I've used it in rails several times, and my projects where I use Grails mostly, the ability is sorely missed. See example below:

class Employee {
    static hasMany = [projects: Project]

    static mapping = {
        projects joinTable: [name: 'EMP_PROJ',
                             column: 'PROJECT_ID',
                             key: 'EMPLOYEE_ID', where: {->
            [type_column: this.some_discriminator_column_of_this_instance]
        }
    }
}

[graemerocher]

Not sure if this is possible with Hibernate. I know there is a sql mapping you can apply to columns.. so that may be the way to do this.