'Varchar', ]; private static $has_one = [ 'Child' => Child::class, 'ChildPolymorphic' => DataObject::class, ]; private static $has_many = [ 'ChildrenHasMany' => Child::class . '.Parent', ]; private static $many_many = [ 'ChildrenManyMany' => Child::class, 'ChildrenManyManyThrough' => [ 'through' => ParentChildJoin::class, 'from' => 'Parent', 'to' => 'Child', ] ]; }