## 代码 ``` <?php namespace app\admin\validate; use think\Validate; use think\Db; class AdminMenuValidate extends Validate { protected $rule = [ 'name' => 'require', 'app' => 'require', 'controller' => 'require', 'parent_id' => 'checkParentId', 'action' => 'require|unique:AdminMenu,app^controller^action', ]; protected $message = [ 'name.require' => '名称不能为空', 'app.require' => '应用不能为空', 'parent_id' => '超过了4级', 'controller.require' => '名称不能为空', 'action.require' => '名称不能为空', 'action.unique' => '同样的记录已经存在!', ]; protected $scene = [ 'add' => ['name', 'app', 'controller', 'action', 'parent_id'], 'edit' => ['name', 'app', 'controller', 'action', 'id', 'parent_id'], ]; // 自定义验证规则:菜单只能三级 protected function checkParentId($value) { $find = Db::name('AdminMenu')->where(["id" => $value])->value('parent_id'); if ($find) { $find2 = Db::name('AdminMenu')->where(["id" => $find])->value('parent_id'); if ($find2) { $find3 = Db::name('AdminMenu')->where(["id" => $find2])->value('parent_id'); if ($find3) { return false; } } } return true; } } ```