where(['parent_id'=>0])->select(['id','name']); } public static function categoryDis($id) { return array_column(CategoryDistrict::where('parent_id', $id)->get(['id', 'name'])->toArray(), 'name', 'id'); } public function children() { return $this->hasMany(CategoryDistrict::class, 'parent_id')->orderBy('order','desc'); } }