fix rename bug (#562)

### What problem does this PR solve?

fix rename file bugs
### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

api/apps/document_app.py

@@ -250,12 +250,10 @@ def rm():
         except Exception as e:
             errors += str(e)
 
-
     if errors: return server_error_response(e)
     return get_json_result(data=True)
 
 
-
 @manager.route('/run', methods=['POST'])
 @login_required
 @validate_request("doc_ids", "run")
@@ -305,6 +303,11 @@ def rename():
             return get_data_error_result(
                 retmsg="Database error (Document rename)!")
 
+        informs = File2DocumentService.get_by_document_id(req["doc_id"])
+        if informs:
+            e, file = FileService.get_by_id(informs[0].file_id)
+            FileService.update_by_id(file.id, {"name": req["name"]})
+
         return get_json_result(data=True)
     except Exception as e:
         return server_error_response(e)