hasMany(self::class, 'parent_id', 'city_id')->order('id ASC'); } /** * city搜索器 * @param Model $query * @param $value */ public function searchCityIdAttr($query, $value) { if (is_array($value)) { $query->whereIn('city_id', $value); } else { $query->where('city_id', $value); } } /** * ParentId搜索器 * @param Model $query * @param $value */ public function searchParentIdAttr($query, $value) { $query->where('parent_id', $value); } }