compatibility fix for event callback

for callbacks without sqlalchemy.util.portable_instancemethod wrapper
python-gino · Jun 20, 2020 · 7e07d1e · 7e07d1e
1 parent 8131fb0
commit 7e07d1e
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/gino/schema.py b/src/gino/schema.py
@@ -399,7 +399,9 @@ async def _on_metadata_drop_async(self, target, bind, **kw):
 
 
 async def _call_portable_instancemethod(fn, args, kw):
-    m = getattr(fn.target, fn.name + "_async", None)
+    m = None
+    if hasattr(fn, 'target'):
+        m = getattr(fn.target, fn.name + "_async", None)
     if m is None:
         return fn(*args, **kw)
     else: