mirror of
https://github.com/django/django.git
synced 2024-12-23 09:36:06 +00:00
d62563cbb1
This stops ordering by nested selected references. It's not supported on
PostgreSQL and not required to support psycopg3.
Regression in 04518e310d.
Thanks Matt Westcott for the report.
610 lines
20 KiB
Python
610 lines
20 KiB
Python
from datetime import datetime
|
|
from operator import attrgetter
|
|
|
|
from django.core.exceptions import FieldError
|
|
from django.db.models import (
|
|
CharField,
|
|
Count,
|
|
DateTimeField,
|
|
F,
|
|
Max,
|
|
OuterRef,
|
|
Subquery,
|
|
Value,
|
|
)
|
|
from django.db.models.functions import Length, Upper
|
|
from django.test import TestCase
|
|
|
|
from .models import (
|
|
Article,
|
|
Author,
|
|
ChildArticle,
|
|
OrderedByExpression,
|
|
OrderedByExpressionChild,
|
|
OrderedByExpressionGrandChild,
|
|
OrderedByFArticle,
|
|
Reference,
|
|
)
|
|
|
|
|
|
class OrderingTests(TestCase):
|
|
@classmethod
|
|
def setUpTestData(cls):
|
|
cls.a1 = Article.objects.create(
|
|
headline="Article 1", pub_date=datetime(2005, 7, 26)
|
|
)
|
|
cls.a2 = Article.objects.create(
|
|
headline="Article 2", pub_date=datetime(2005, 7, 27)
|
|
)
|
|
cls.a3 = Article.objects.create(
|
|
headline="Article 3", pub_date=datetime(2005, 7, 27)
|
|
)
|
|
cls.a4 = Article.objects.create(
|
|
headline="Article 4", pub_date=datetime(2005, 7, 28)
|
|
)
|
|
cls.author_1 = Author.objects.create(name="Name 1")
|
|
cls.author_2 = Author.objects.create(name="Name 2")
|
|
for i in range(2):
|
|
Author.objects.create()
|
|
|
|
def test_default_ordering(self):
|
|
"""
|
|
By default, Article.objects.all() orders by pub_date descending, then
|
|
headline ascending.
|
|
"""
|
|
self.assertQuerySetEqual(
|
|
Article.objects.all(),
|
|
[
|
|
"Article 4",
|
|
"Article 2",
|
|
"Article 3",
|
|
"Article 1",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
# Getting a single item should work too:
|
|
self.assertEqual(Article.objects.all()[0], self.a4)
|
|
|
|
def test_default_ordering_override(self):
|
|
"""
|
|
Override ordering with order_by, which is in the same format as the
|
|
ordering attribute in models.
|
|
"""
|
|
self.assertQuerySetEqual(
|
|
Article.objects.order_by("headline"),
|
|
[
|
|
"Article 1",
|
|
"Article 2",
|
|
"Article 3",
|
|
"Article 4",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
self.assertQuerySetEqual(
|
|
Article.objects.order_by("pub_date", "-headline"),
|
|
[
|
|
"Article 1",
|
|
"Article 3",
|
|
"Article 2",
|
|
"Article 4",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
def test_default_ordering_override_unknown_field(self):
|
|
"""
|
|
Attempts to override default ordering on related models with an unknown
|
|
field should result in an error.
|
|
"""
|
|
msg = (
|
|
"Cannot resolve keyword 'unknown_field' into field. Choices are: "
|
|
"article, author, editor, editor_id, id, name"
|
|
)
|
|
with self.assertRaisesMessage(FieldError, msg):
|
|
list(Article.objects.order_by("author__unknown_field"))
|
|
|
|
def test_order_by_override(self):
|
|
"""
|
|
Only the last order_by has any effect (since they each override any
|
|
previous ordering).
|
|
"""
|
|
self.assertQuerySetEqual(
|
|
Article.objects.order_by("id"),
|
|
[
|
|
"Article 1",
|
|
"Article 2",
|
|
"Article 3",
|
|
"Article 4",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
self.assertQuerySetEqual(
|
|
Article.objects.order_by("id").order_by("-headline"),
|
|
[
|
|
"Article 4",
|
|
"Article 3",
|
|
"Article 2",
|
|
"Article 1",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
def test_order_by_nulls_first_and_last(self):
|
|
msg = "nulls_first and nulls_last are mutually exclusive"
|
|
with self.assertRaisesMessage(ValueError, msg):
|
|
Article.objects.order_by(
|
|
F("author").desc(nulls_last=True, nulls_first=True)
|
|
)
|
|
|
|
def assertQuerySetEqualReversible(self, queryset, sequence):
|
|
self.assertSequenceEqual(queryset, sequence)
|
|
self.assertSequenceEqual(queryset.reverse(), list(reversed(sequence)))
|
|
|
|
def test_order_by_nulls_last(self):
|
|
Article.objects.filter(headline="Article 3").update(author=self.author_1)
|
|
Article.objects.filter(headline="Article 4").update(author=self.author_2)
|
|
# asc and desc are chainable with nulls_last.
|
|
self.assertQuerySetEqualReversible(
|
|
Article.objects.order_by(F("author").desc(nulls_last=True), "headline"),
|
|
[self.a4, self.a3, self.a1, self.a2],
|
|
)
|
|
self.assertQuerySetEqualReversible(
|
|
Article.objects.order_by(F("author").asc(nulls_last=True), "headline"),
|
|
[self.a3, self.a4, self.a1, self.a2],
|
|
)
|
|
self.assertQuerySetEqualReversible(
|
|
Article.objects.order_by(
|
|
Upper("author__name").desc(nulls_last=True), "headline"
|
|
),
|
|
[self.a4, self.a3, self.a1, self.a2],
|
|
)
|
|
self.assertQuerySetEqualReversible(
|
|
Article.objects.order_by(
|
|
Upper("author__name").asc(nulls_last=True), "headline"
|
|
),
|
|
[self.a3, self.a4, self.a1, self.a2],
|
|
)
|
|
|
|
def test_order_by_nulls_first(self):
|
|
Article.objects.filter(headline="Article 3").update(author=self.author_1)
|
|
Article.objects.filter(headline="Article 4").update(author=self.author_2)
|
|
# asc and desc are chainable with nulls_first.
|
|
self.assertQuerySetEqualReversible(
|
|
Article.objects.order_by(F("author").asc(nulls_first=True), "headline"),
|
|
[self.a1, self.a2, self.a3, self.a4],
|
|
)
|
|
self.assertQuerySetEqualReversible(
|
|
Article.objects.order_by(F("author").desc(nulls_first=True), "headline"),
|
|
[self.a1, self.a2, self.a4, self.a3],
|
|
)
|
|
self.assertQuerySetEqualReversible(
|
|
Article.objects.order_by(
|
|
Upper("author__name").asc(nulls_first=True), "headline"
|
|
),
|
|
[self.a1, self.a2, self.a3, self.a4],
|
|
)
|
|
self.assertQuerySetEqualReversible(
|
|
Article.objects.order_by(
|
|
Upper("author__name").desc(nulls_first=True), "headline"
|
|
),
|
|
[self.a1, self.a2, self.a4, self.a3],
|
|
)
|
|
|
|
def test_orders_nulls_first_on_filtered_subquery(self):
|
|
Article.objects.filter(headline="Article 1").update(author=self.author_1)
|
|
Article.objects.filter(headline="Article 2").update(author=self.author_1)
|
|
Article.objects.filter(headline="Article 4").update(author=self.author_2)
|
|
Author.objects.filter(name__isnull=True).delete()
|
|
author_3 = Author.objects.create(name="Name 3")
|
|
article_subquery = (
|
|
Article.objects.filter(
|
|
author=OuterRef("pk"),
|
|
headline__icontains="Article",
|
|
)
|
|
.order_by()
|
|
.values("author")
|
|
.annotate(
|
|
last_date=Max("pub_date"),
|
|
)
|
|
.values("last_date")
|
|
)
|
|
self.assertQuerySetEqualReversible(
|
|
Author.objects.annotate(
|
|
last_date=Subquery(article_subquery, output_field=DateTimeField())
|
|
)
|
|
.order_by(F("last_date").asc(nulls_first=True))
|
|
.distinct(),
|
|
[author_3, self.author_1, self.author_2],
|
|
)
|
|
|
|
def test_stop_slicing(self):
|
|
"""
|
|
Use the 'stop' part of slicing notation to limit the results.
|
|
"""
|
|
self.assertQuerySetEqual(
|
|
Article.objects.order_by("headline")[:2],
|
|
[
|
|
"Article 1",
|
|
"Article 2",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
def test_stop_start_slicing(self):
|
|
"""
|
|
Use the 'stop' and 'start' parts of slicing notation to offset the
|
|
result list.
|
|
"""
|
|
self.assertQuerySetEqual(
|
|
Article.objects.order_by("headline")[1:3],
|
|
[
|
|
"Article 2",
|
|
"Article 3",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
def test_random_ordering(self):
|
|
"""
|
|
Use '?' to order randomly.
|
|
"""
|
|
self.assertEqual(len(list(Article.objects.order_by("?"))), 4)
|
|
|
|
def test_reversed_ordering(self):
|
|
"""
|
|
Ordering can be reversed using the reverse() method on a queryset.
|
|
This allows you to extract things like "the last two items" (reverse
|
|
and then take the first two).
|
|
"""
|
|
self.assertQuerySetEqual(
|
|
Article.objects.reverse()[:2],
|
|
[
|
|
"Article 1",
|
|
"Article 3",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
def test_reverse_ordering_pure(self):
|
|
qs1 = Article.objects.order_by(F("headline").asc())
|
|
qs2 = qs1.reverse()
|
|
self.assertQuerySetEqual(
|
|
qs2,
|
|
[
|
|
"Article 4",
|
|
"Article 3",
|
|
"Article 2",
|
|
"Article 1",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
self.assertQuerySetEqual(
|
|
qs1,
|
|
[
|
|
"Article 1",
|
|
"Article 2",
|
|
"Article 3",
|
|
"Article 4",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
def test_reverse_meta_ordering_pure(self):
|
|
Article.objects.create(
|
|
headline="Article 5",
|
|
pub_date=datetime(2005, 7, 30),
|
|
author=self.author_1,
|
|
second_author=self.author_2,
|
|
)
|
|
Article.objects.create(
|
|
headline="Article 5",
|
|
pub_date=datetime(2005, 7, 30),
|
|
author=self.author_2,
|
|
second_author=self.author_1,
|
|
)
|
|
self.assertQuerySetEqual(
|
|
Article.objects.filter(headline="Article 5").reverse(),
|
|
["Name 2", "Name 1"],
|
|
attrgetter("author.name"),
|
|
)
|
|
self.assertQuerySetEqual(
|
|
Article.objects.filter(headline="Article 5"),
|
|
["Name 1", "Name 2"],
|
|
attrgetter("author.name"),
|
|
)
|
|
|
|
def test_no_reordering_after_slicing(self):
|
|
msg = "Cannot reverse a query once a slice has been taken."
|
|
qs = Article.objects.all()[0:2]
|
|
with self.assertRaisesMessage(TypeError, msg):
|
|
qs.reverse()
|
|
with self.assertRaisesMessage(TypeError, msg):
|
|
qs.last()
|
|
|
|
def test_extra_ordering(self):
|
|
"""
|
|
Ordering can be based on fields included from an 'extra' clause
|
|
"""
|
|
self.assertQuerySetEqual(
|
|
Article.objects.extra(
|
|
select={"foo": "pub_date"}, order_by=["foo", "headline"]
|
|
),
|
|
[
|
|
"Article 1",
|
|
"Article 2",
|
|
"Article 3",
|
|
"Article 4",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
def test_extra_ordering_quoting(self):
|
|
"""
|
|
If the extra clause uses an SQL keyword for a name, it will be
|
|
protected by quoting.
|
|
"""
|
|
self.assertQuerySetEqual(
|
|
Article.objects.extra(
|
|
select={"order": "pub_date"}, order_by=["order", "headline"]
|
|
),
|
|
[
|
|
"Article 1",
|
|
"Article 2",
|
|
"Article 3",
|
|
"Article 4",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
def test_extra_ordering_with_table_name(self):
|
|
self.assertQuerySetEqual(
|
|
Article.objects.extra(order_by=["ordering_article.headline"]),
|
|
[
|
|
"Article 1",
|
|
"Article 2",
|
|
"Article 3",
|
|
"Article 4",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
self.assertQuerySetEqual(
|
|
Article.objects.extra(order_by=["-ordering_article.headline"]),
|
|
[
|
|
"Article 4",
|
|
"Article 3",
|
|
"Article 2",
|
|
"Article 1",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
def test_order_by_pk(self):
|
|
"""
|
|
'pk' works as an ordering option in Meta.
|
|
"""
|
|
self.assertEqual(
|
|
[a.pk for a in Author.objects.all()],
|
|
[a.pk for a in Author.objects.order_by("-pk")],
|
|
)
|
|
|
|
def test_order_by_fk_attname(self):
|
|
"""
|
|
ordering by a foreign key by its attribute name prevents the query
|
|
from inheriting its related model ordering option (#19195).
|
|
"""
|
|
authors = list(Author.objects.order_by("id"))
|
|
for i in range(1, 5):
|
|
author = authors[i - 1]
|
|
article = getattr(self, "a%d" % (5 - i))
|
|
article.author = author
|
|
article.save(update_fields={"author"})
|
|
|
|
self.assertQuerySetEqual(
|
|
Article.objects.order_by("author_id"),
|
|
[
|
|
"Article 4",
|
|
"Article 3",
|
|
"Article 2",
|
|
"Article 1",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
def test_order_by_self_referential_fk(self):
|
|
self.a1.author = Author.objects.create(editor=self.author_1)
|
|
self.a1.save()
|
|
self.a2.author = Author.objects.create(editor=self.author_2)
|
|
self.a2.save()
|
|
self.assertQuerySetEqual(
|
|
Article.objects.filter(author__isnull=False).order_by("author__editor"),
|
|
["Article 2", "Article 1"],
|
|
attrgetter("headline"),
|
|
)
|
|
self.assertQuerySetEqual(
|
|
Article.objects.filter(author__isnull=False).order_by("author__editor_id"),
|
|
["Article 1", "Article 2"],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
def test_order_by_f_expression(self):
|
|
self.assertQuerySetEqual(
|
|
Article.objects.order_by(F("headline")),
|
|
[
|
|
"Article 1",
|
|
"Article 2",
|
|
"Article 3",
|
|
"Article 4",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
self.assertQuerySetEqual(
|
|
Article.objects.order_by(F("headline").asc()),
|
|
[
|
|
"Article 1",
|
|
"Article 2",
|
|
"Article 3",
|
|
"Article 4",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
self.assertQuerySetEqual(
|
|
Article.objects.order_by(F("headline").desc()),
|
|
[
|
|
"Article 4",
|
|
"Article 3",
|
|
"Article 2",
|
|
"Article 1",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
def test_order_by_f_expression_duplicates(self):
|
|
"""
|
|
A column may only be included once (the first occurrence) so we check
|
|
to ensure there are no duplicates by inspecting the SQL.
|
|
"""
|
|
qs = Article.objects.order_by(F("headline").asc(), F("headline").desc())
|
|
sql = str(qs.query).upper()
|
|
fragment = sql[sql.find("ORDER BY") :]
|
|
self.assertEqual(fragment.count("HEADLINE"), 1)
|
|
self.assertQuerySetEqual(
|
|
qs,
|
|
[
|
|
"Article 1",
|
|
"Article 2",
|
|
"Article 3",
|
|
"Article 4",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
qs = Article.objects.order_by(F("headline").desc(), F("headline").asc())
|
|
sql = str(qs.query).upper()
|
|
fragment = sql[sql.find("ORDER BY") :]
|
|
self.assertEqual(fragment.count("HEADLINE"), 1)
|
|
self.assertQuerySetEqual(
|
|
qs,
|
|
[
|
|
"Article 4",
|
|
"Article 3",
|
|
"Article 2",
|
|
"Article 1",
|
|
],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
def test_order_by_constant_value(self):
|
|
# Order by annotated constant from selected columns.
|
|
qs = Article.objects.annotate(
|
|
constant=Value("1", output_field=CharField()),
|
|
).order_by("constant", "-headline")
|
|
self.assertSequenceEqual(qs, [self.a4, self.a3, self.a2, self.a1])
|
|
# Order by annotated constant which is out of selected columns.
|
|
self.assertSequenceEqual(
|
|
qs.values_list("headline", flat=True),
|
|
[
|
|
"Article 4",
|
|
"Article 3",
|
|
"Article 2",
|
|
"Article 1",
|
|
],
|
|
)
|
|
# Order by constant.
|
|
qs = Article.objects.order_by(Value("1", output_field=CharField()), "-headline")
|
|
self.assertSequenceEqual(qs, [self.a4, self.a3, self.a2, self.a1])
|
|
|
|
def test_related_ordering_duplicate_table_reference(self):
|
|
"""
|
|
An ordering referencing a model with an ordering referencing a model
|
|
multiple time no circular reference should be detected (#24654).
|
|
"""
|
|
first_author = Author.objects.create()
|
|
second_author = Author.objects.create()
|
|
self.a1.author = first_author
|
|
self.a1.second_author = second_author
|
|
self.a1.save()
|
|
self.a2.author = second_author
|
|
self.a2.second_author = first_author
|
|
self.a2.save()
|
|
r1 = Reference.objects.create(article_id=self.a1.pk)
|
|
r2 = Reference.objects.create(article_id=self.a2.pk)
|
|
self.assertSequenceEqual(Reference.objects.all(), [r2, r1])
|
|
|
|
def test_default_ordering_by_f_expression(self):
|
|
"""F expressions can be used in Meta.ordering."""
|
|
articles = OrderedByFArticle.objects.all()
|
|
articles.filter(headline="Article 2").update(author=self.author_2)
|
|
articles.filter(headline="Article 3").update(author=self.author_1)
|
|
self.assertQuerySetEqual(
|
|
articles,
|
|
["Article 1", "Article 4", "Article 3", "Article 2"],
|
|
attrgetter("headline"),
|
|
)
|
|
|
|
def test_order_by_ptr_field_with_default_ordering_by_expression(self):
|
|
ca1 = ChildArticle.objects.create(
|
|
headline="h2",
|
|
pub_date=datetime(2005, 7, 27),
|
|
author=self.author_2,
|
|
)
|
|
ca2 = ChildArticle.objects.create(
|
|
headline="h2",
|
|
pub_date=datetime(2005, 7, 27),
|
|
author=self.author_1,
|
|
)
|
|
ca3 = ChildArticle.objects.create(
|
|
headline="h3",
|
|
pub_date=datetime(2005, 7, 27),
|
|
author=self.author_1,
|
|
)
|
|
ca4 = ChildArticle.objects.create(headline="h1", pub_date=datetime(2005, 7, 28))
|
|
articles = ChildArticle.objects.order_by("article_ptr")
|
|
self.assertSequenceEqual(articles, [ca4, ca2, ca1, ca3])
|
|
|
|
def test_default_ordering_does_not_affect_group_by(self):
|
|
Article.objects.exclude(headline="Article 4").update(author=self.author_1)
|
|
Article.objects.filter(headline="Article 4").update(author=self.author_2)
|
|
articles = Article.objects.values("author").annotate(count=Count("author"))
|
|
self.assertCountEqual(
|
|
articles,
|
|
[
|
|
{"author": self.author_1.pk, "count": 3},
|
|
{"author": self.author_2.pk, "count": 1},
|
|
],
|
|
)
|
|
|
|
def test_order_by_parent_fk_with_expression_in_default_ordering(self):
|
|
p3 = OrderedByExpression.objects.create(name="oBJ 3")
|
|
p2 = OrderedByExpression.objects.create(name="OBJ 2")
|
|
p1 = OrderedByExpression.objects.create(name="obj 1")
|
|
c3 = OrderedByExpressionChild.objects.create(parent=p3)
|
|
c2 = OrderedByExpressionChild.objects.create(parent=p2)
|
|
c1 = OrderedByExpressionChild.objects.create(parent=p1)
|
|
self.assertSequenceEqual(
|
|
OrderedByExpressionChild.objects.order_by("parent"),
|
|
[c1, c2, c3],
|
|
)
|
|
|
|
def test_order_by_grandparent_fk_with_expression_in_default_ordering(self):
|
|
p3 = OrderedByExpression.objects.create(name="oBJ 3")
|
|
p2 = OrderedByExpression.objects.create(name="OBJ 2")
|
|
p1 = OrderedByExpression.objects.create(name="obj 1")
|
|
c3 = OrderedByExpressionChild.objects.create(parent=p3)
|
|
c2 = OrderedByExpressionChild.objects.create(parent=p2)
|
|
c1 = OrderedByExpressionChild.objects.create(parent=p1)
|
|
g3 = OrderedByExpressionGrandChild.objects.create(parent=c3)
|
|
g2 = OrderedByExpressionGrandChild.objects.create(parent=c2)
|
|
g1 = OrderedByExpressionGrandChild.objects.create(parent=c1)
|
|
self.assertSequenceEqual(
|
|
OrderedByExpressionGrandChild.objects.order_by("parent"),
|
|
[g1, g2, g3],
|
|
)
|
|
|
|
def test_order_by_expression_ref(self):
|
|
self.assertQuerySetEqual(
|
|
Author.objects.annotate(upper_name=Upper("name")).order_by(
|
|
Length("upper_name")
|
|
),
|
|
Author.objects.order_by(Length(Upper("name"))),
|
|
)
|