public function congvandens() { return belongsToMany('App\\Congvanden', 'file_traloicongvandens', 'file_id', 'congvanden_id'); }
public function grupos() { return belongsToMany('GrupoDental'); }
public function mails() { return belongsToMany('App\\Mymail', 'id', 'nguoigui_id'); }
public function addresses() { return belongsToMany('core\\Models\\address'); }