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