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Code Issues 32 Releases Wiki Activity

Fixed #26517 -- Fixed ExpressionWrapper with empty queryset.

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This commit is contained in:
Johannes Dollinger
2016-08-05 09:09:01 -04:00
committed by Tim Graham
parent 1410616e0e
commit c002a0d39f
2 changed files with 20 additions and 2 deletions
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15
tests/annotations/tests.py
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@@ -6,7 +6,7 @@ from decimal import Decimal
from django.core.exceptions import FieldDoesNotExist, FieldError
from django.db.models import (
BooleanField, CharField, Count, DateTimeField, ExpressionWrapper, F, Func,
IntegerField, Sum, Value,
IntegerField, Q, Sum, Value,
)
from django.db.models.functions import Lower
from django.test import TestCase, skipUnlessDBFeature
@@ -148,6 +148,19 @@ class NonAggregateAnnotationTestCase(TestCase):
combined = int(test.pages + test.rating)
self.assertEqual(b.combined, combined)
def test_empty_expression_annotation(self):
books = Book.objects.annotate(
selected=ExpressionWrapper(Q(pk__in=[]), output_field=BooleanField())
)
self.assertEqual(len(books), Book.objects.count())
self.assertTrue(all(not book.selected for book in books))
books = Book.objects.annotate(
selected=ExpressionWrapper(Q(pk__in=Book.objects.none()), output_field=BooleanField())
)
self.assertEqual(len(books), Book.objects.count())
self.assertTrue(all(not book.selected for book in books))
def test_annotate_with_aggregation(self):
books = Book.objects.annotate(
is_book=Value(1, output_field=IntegerField()),