.

bigfile/file_zodb.py

@@ -662,10 +662,11 @@ class ZBigFile(LivePersistent):
         wcfileh = None
         if _use_wcfs:
             # TODO maintain zconn -> wconn in sync (p_jar -> wconn)
-            zstor = self._p_jar.db().storage
+            zconn = self._p_jar
+            zstor = zconn.db().storage
             zurl = wcfs.zstor_2zurl(zstor)
             wc = wcfs.join(zurl)
-            wconn = wc.connect(p_jar.at())
+            wconn = wc.connect(zconn.at())
             wcfileh = wconn.open(self._p_oid)
 
         fileh = _ZBigFileH(self, wcfileh)