mongodm models

gistfile1.txt

class Base extends Model  {
  static $config = "default";
}

class User extends Base {
    static $collection = "user";

    protected static $attrs = array(
        'first_name' => array( 'type' => 'string' ),
        'last_name' => array( 'type' => 'string' ),
        'contacts' => array( 'model' => 'App\Models\Contact', ' type' => 'references' )
    );
}

class Contact extends Base {
    static $collection = 'contact';
}

---- have also tried ---
class Contact extends Base {
    static $collection = 'contact';

    protected static $attrs = array(
        'user' => array( 'model' => 'App\Models\User', ' type' => 'reference' )
    );
}