Setting Grails domain id in Bootstrap.groovy

new Foo(id: 1234, name: "My Foo").save()

def foo = new Foo()
foo.id = 1234
foo.name = "My Foo"
foo.save()

class Foo {
  String name
  static mapping = {
    id generator:'assigned'
  }
}

class Foo {
  short code /* new field */
  String name

  static constraints = {
    code(unique: true)
    name()
  }
}