分类下如果发布有产品，不允许删除分类

app/Admin/Controllers/CategoryController.php

@@ -3,6 +3,8 @@
 namespace App\Admin\Controllers;
 
 use App\Models\Category;
+use App\Models\Product;
+use Dcat\Admin\Admin;
 use Dcat\Admin\Form;
 use Dcat\Admin\Grid;
 use Dcat\Admin\Layout\Content;
@@ -82,6 +84,30 @@ class CategoryController extends AdminController
         	//后台管理员的agent_id为0
 			$form->agent_id = 0;
 			$form->sort = $form->sort ?? 255;
-        });
+        })->deleting(function (Form $form) {
+			//获取到要删除分类的ID
+			$category_id = (int)$form->getKey();
+
+			//获取要删除类目的所有下级ID
+			$category = Category::where('agent_id', 0)->pluck('pid', 'id')->toArray();
+			$ids = getChildCate($category_id, $category);
+
+			if (Product::query()->whereIn('category_id', $ids)->exists()) {
+				return $form->response()->error('该分类下已经发布产品，不允许删除');
+			}
+			return $form->response()->error('不允许删除');
+		});
     }
 }
+
+//获取$pid下的所有子类目
+function getChildCate($pid, $category): array
+{
+	$cate_arr = [$pid];
+	foreach ($category as $k => $v) {
+		if ($v == $pid) {
+			$cate_arr = array_merge($cate_arr, getChildCate($k, $category));
+		}
+	}
+	return $cate_arr;
+}

app/AdminAgent/Controllers/CategoryController.php

@@ -2,6 +2,7 @@
 
 namespace App\AdminAgent\Controllers;
 
+use App\Models\AgentProduct;
 use App\Models\Category;
 use Dcat\Admin\Admin;
 use Dcat\Admin\Form;
@@ -85,6 +86,30 @@ class CategoryController extends AdminController
 
 			$form->agent_id = Admin::user()->id;
 			$form->sort = $form->sort ?? 255;
+		})->deleting(function (Form $form) {
+			//获取到要删除分类的ID
+			$category_id = (int)$form->getKey();
+
+			//获取要删除类目的所有下级ID
+			$agent_id = Admin::user()->id;
+			$category = Category::where('agent_id', $agent_id)->pluck('pid', 'id')->toArray();
+			$ids = getChildCate($category_id, $category);
+
+			if (AgentProduct::query()->where('agent_id', $agent_id)->whereIn('category_id', $ids)->exists()) {
+				return $form->response()->error('该分类下已经发布产品，不允许删除');
+			}
 		});
     }
 }
+
+//获取$pid下的所有子类目
+function getChildCate($pid, $category): array
+{
+	$cate_arr = [$pid];
+	foreach ($category as $k => $v) {
+		if ($v == $pid) {
+			$cate_arr = array_merge($cate_arr, getChildCate($k, $category));
+		}
+	}
+	return $cate_arr;
+}