Make render_statement SA 1.0 compliant

sqlalchemy_utils/functions/render.py

@@ -58,7 +58,7 @@ def render_statement(statement, bind=None):
 
     if isinstance(statement, sa.orm.query.Query):
         if bind is None:
-            bind = statement.session.get_bind(statement._mapper_zero_or_none())
+            bind = statement.session.get_bind(statement._mapper_zero())
 
         statement = statement.statement
 

tests/functions/test_render.py

@@ -17,7 +17,7 @@ class TestRender(TestCase):
 
         self.User = User
 
-    def test_render_statement_query(self):
+    def test_render_orm_query(self):
         query = self.session.query(self.User).filter_by(id=3)
         text = render_statement(query)
 
@@ -33,6 +33,12 @@ class TestRender(TestCase):
         assert 'FROM user' in text
         assert 'WHERE user.id = 3' in text
 
+    def test_render_statement_without_mapper(self):
+        statement = sa.select([sa.text('1')])
+        text = render_statement(statement, bind=self.session.bind)
+
+        assert 'SELECT 1' in text
+
     def test_render_ddl(self):
         expression = 'self.User.__table__.create(engine)'
         stream = render_expression(expression, self.engine)