patch to fix deleted contact and addresses

patches/december_2012/deleted_contact_address_patch.py

@@ -0,0 +1,12 @@
+import webnotes
+def execute():
+	"""finds references of deleted addresses and contacts and deletes these references"""
+	import webnotes.model
+
+	for dt in ["Address", "Contact"]:
+		link_fields = webnotes.model.get_link_fields(dt)
+		for parent, lf in link_fields:
+			webnotes.conn.sql("""update `tab%s` ref set `%s`=null
+				where ifnull(`%s`, '')!='' and not exists (
+					select * from `tab%s` where name=ref.`%s`)""" % \
+				(parent, lf, lf, dt, lf))