From 160969d97080b53e9113cadcecc27c26a51881e8 Mon Sep 17 00:00:00 2001
From: Simon Charette <charette.s@gmail.com>
Date: Thu, 13 Jul 2017 02:46:44 -0400
Subject: [PATCH] Refs #24887 -- 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().
---
tests/aggregation/tests.py | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/tests/aggregation/tests.py b/tests/aggregation/tests.py
index 3c53877303..c45cb8fc33 100644
--- a/tests/aggregation/tests.py
+++ b/tests/aggregation/tests.py
@@ -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'))