# HG changeset patch
# User Sylvain Thénault <sylvain.thenault@logilab.fr>
# Date 1336639048 -7200
# Node ID 42ec34b3ced9f17d6e1245d47b8c4a75b0718939
# Parent  8d58fcf68539ec57f420a2f76abf7060344f10d9# Parent  41729460d8c30f49b5bb99ac20cf4a8597d432fe
backport stable

diff -r 8d58fcf68539 -r 42ec34b3ced9 predicates.py
--- a/predicates.py	Thu May 10 10:31:53 2012 +0200
+++ b/predicates.py	Thu May 10 10:37:28 2012 +0200
@@ -618,8 +618,9 @@
     """
 
     def __call__(self, cls, req, rset=None, **kwargs):
-        # 'or 0' since we *must not* return None
-        return rset and self.match_expected(len(rset.rows[0])) or 0
+        # 'or 0' since we *must not* return None. Also don't use rset.rows so
+        # this selector will work if rset is a simple list of list.
+        return rset and self.match_expected(len(rset[0])) or 0
 
 
 class paginated_rset(Predicate):
diff -r 8d58fcf68539 -r 42ec34b3ced9 selectors.py