Update CatalogController.class.php

server/Application/Api/Controller/CatalogController.class.php

@@ -113,6 +113,12 @@ class CatalogController extends BaseController {
 
         if ($cat_id > 0 ) {
             
+            //如果一个目录已经是别的目录的父目录，那么它将无法再转为level4目录
+            if (D("Catalog")->where(" parent_cat_id = '$cat_id' ")->find() && $data['level'] == 4 ) {
+                $this->sendError(10101,"该目录含有子目录，不允许转为底层目录。");
+                return;
+            }
+            
             $ret = D("Catalog")->where(" cat_id = '$cat_id' ")->save($data);
             $return = D("Catalog")->where(" cat_id = '$cat_id' ")->find();