Added __len__ to AppenderQuery/AppenderMixin.pr/28

2 files changed, 9 insertions, 0 deletions

diff --git a/lib/sqlalchemy/orm/dynamic.py b/lib/sqlalchemy/orm/dynamic.py
index 4631e806f..1878893b0 100644
--- a/lib/sqlalchemy/orm/dynamic.py
+++ b/lib/sqlalchemy/orm/dynamic.py
@@ -249,6 +249,9 @@ class AppenderMixin(object):
         else:
             return self._clone(sess).__getitem__(index)
 
+    def __len__(self):
+        return self.count()
+
     def count(self):
         sess = self.session
         if sess is None:
diff --git a/test/orm/test_dynamic.py b/test/orm/test_dynamic.py
index 21dcfd436..12b1cd254 100644
--- a/test/orm/test_dynamic.py
+++ b/test/orm/test_dynamic.py
@@ -169,6 +169,12 @@ class DynamicTest(_DynamicFixture, _fixtures.FixtureTest, AssertsCompiledSQL):
         u = sess.query(User).first()
         eq_(u.addresses.count(), 1)
 
+    def test_len(self):
+        User, Address = self._user_address_fixture()
+        sess = create_session()
+        u = sess.query(User).first()
+        eq_(len(u.addresses), 1)
+
     def test_dynamic_on_backref(self):
         users, Address, addresses, User = (self.tables.users,
                                 self.classes.Address,