diff --git a/doc/_common.py b/doc/_common.py
index e1aac11e..bfe2cc1d 100644
--- a/doc/_common.py
+++ b/doc/_common.py
@@ -1210,7 +1210,9 @@ class Sign(object):
 class ShopTrans(object):
     
     def __init__(self):
-        ['trans_id', '', 'trans_id'],
-        ['!params', [''], 'params'],
-        ['item_id', 0, 'item_id'],
-        ['item_num', 0, 'item_num'],
\ No newline at end of file
+        self.fields = [
+            ['trans_id', '', 'trans_id'],
+            ['!params', [''], 'params'],
+            ['item_id', 0, 'item_id'],
+            ['item_num', 0, 'item_num'],
+        ]
\ No newline at end of file