Refs -- Stopped mutating a test expression during as_sql().
Also defined an explicit output_field as it was mixing an expression with an
IntegerField() with one with a DecimalField().
@@ -1099,9 +1099,12 @@ class AggregateTestCase(TestCase):
def test_multi_arg_aggregate(self):
class MyMax(Max):
+ output_field = DecimalField()
+
def as_sql(self, compiler, connection):
- self.set_source_expressions(self.get_source_expressions()[0:1])
- return super().as_sql(compiler, connection)
+ copy = self.copy()
+ copy.set_source_expressions(copy.get_source_expressions()[0:1])
+ return super(MyMax, copy).as_sql(compiler, connection)
with self.assertRaisesMessage(TypeError, 'Complex aggregates require an alias'):
Book.objects.aggregate(MyMax('pages', 'price'))
