Fixed a regression caused by [ticket:2682] whereby the

evaluation invoked by :meth:`.Query.update` and :meth:`.Query.delete`
would hit upon unsupported ``True`` and ``False`` symbols
which now appear due to the usage of ``IS``.
[ticket:2737]

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/sqlalchemy/orm/evaluator.py b/lib/sqlalchemy/orm/evaluator.py
index e8433290c..458eab7a1 100644
--- a/lib/sqlalchemy/orm/evaluator.py
+++ b/lib/sqlalchemy/orm/evaluator.py
@@ -40,6 +40,12 @@ class EvaluatorCompiler(object):
     def visit_null(self, clause):
         return lambda obj: None
 
+    def visit_false(self, clause):
+        return lambda obj: False
+
+    def visit_true(self, clause):
+        return lambda obj: True
+
     def visit_column(self, clause):
         if 'parentmapper' in clause._annotations:
             key = clause._annotations['parentmapper'].\