'string' ]; /** * Validation rules * * @var array */ public static $rules = [ 'assignee_id' => 'required', 'assignee_type' => 'required', 'assignment_id' => 'required' ]; public function departments() { return $this->morphedByMany(Department::class, 'assignee'); } public function users() { return $this->morphedByMany(User::class, 'assignee'); } }