dl_admin/ruoyi-admin/src/main/java/com/ruoyi/busi/service/impl/BusiCategoryServiceImpl.java

@@ -93,7 +93,13 @@ public class BusiCategoryServiceImpl extends ServiceImpl<BusiCategoryMapper, Bus
         if (categoryList == null || categoryList.isEmpty()) {
             return categoryList;
         }
+        // 构建id到节点的映射，便于查找
+        Map<String, BusiCategory> idToCategory = new HashMap<>();
+        for (BusiCategory category : categoryList) {
+            idToCategory.put(category.getId(), category);
+        }
 
+        // 构建树结构（找出根节点）
         // 找到所有根节点（parentId为null）
         List<BusiCategory> roots = new ArrayList<>();
         for (BusiCategory category : categoryList) {