refactor: 修改产品分类父级不为自身或子分类

app/admin/controller/v1/ProductCategory.php

@@ -82,7 +82,7 @@ class ProductCategory
         $data = array_merge($post, ['language_id' => request()->lang_id]);
 
         $validate = new ProductCategoryValidate;
-        if (!$validate->check($data)) {
+        if (!$validate->scene('add')->check($data)) {
             return error($validate->getError());
         }
 

app/admin/validate/v1/ProductCategoryValidate.php

@@ -3,6 +3,8 @@ declare (strict_types = 1);
 
 namespace app\admin\validate\v1;
 
+use app\admin\model\v1\ProductCategoryModel;
+use think\facade\Db;
 use think\Validate;
 
 class ProductCategoryValidate extends Validate
@@ -14,8 +16,10 @@ class ProductCategoryValidate extends Validate
      * @var array
      */
     protected $rule = [
+        'id'                   => 'require|integer',
         'language_id'          => 'require|integer',
         'unique_id'            => 'require',
+        'pid'                  => 'integer|different:id|checkPidNotBeChildren',
         'name'                 => 'require|max:64',
         'icon'                 => 'max:125',
         'desc'                 => 'max:255',
@@ -35,9 +39,14 @@ class ProductCategoryValidate extends Validate
      * @var array
      */
     protected $message = [
+        'id.require'                   => 'ID不能为空',
+        'id.integer'                   => 'ID必须为整数',
         'language_id.require'          => '语言ID不能为空',
         'language_id.integer'          => '语言ID必须为整数',
         'unique_id.require'            => '唯一标识不能为空',
+        'pid.different'                => '父级ID不能为自身',
+        'pid.checkPidNotBeChildren'    => '父级ID不能为自身的子分类',
+        'pid.integer'                  => '父级ID必须为整数',
         'name.require'                 => '名称不能为空',
         'name.max'                     => '名称最多不能超过64个字符',
         'icon.max'                     => '图标最多不能超过125个字符',
@@ -50,4 +59,36 @@ class ProductCategoryValidate extends Validate
         'seo_keywords.max'             => 'SEO关键字最多不能超过255个字符',
         'seo_desc.max'                 => 'SEO描述最多不能超过255个字符',
     ];
+
+    // 验证pid
+    protected function checkPidNotBeChildren($value, $rule, $data = [])
+    {
+        if ($value == 0) {
+            return true;
+        }
+        $table_name = (new ProductCategoryModel)->getTable();
+        $children = Db::query(
+            preg_replace(
+                '/\s+/u', 
+                ' ',
+                "WITH RECURSIVE tree_by AS (
+                    SELECT a.id, a.pid FROM $table_name a WHERE a.id = {$data['id']}
+                    UNION ALL
+                    SELECT k.id, k.pid FROM $table_name k INNER JOIN tree_by t ON t.id = k.pid
+                )
+                SELECT id FROM tree_by WHERE id <> {$data['id']};"
+            )
+        );
+        if (!empty($children) && in_array($data['pid'], array_column($children, 'id'))) {
+            return false;
+        }
+
+        return true;
+    }
+
+    // 新增场景
+    public function sceneAdd()
+    {
+        return $this->remove('id', 'require|integer')->remove('pid', 'different|checkPidNotBeChildren');
+    }
 }