371 lines
12 KiB
Python
371 lines
12 KiB
Python
from datetime import datetime
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from operator import attrgetter
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from django.db.models import F
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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 Article, Author, Reference
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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(headline="Article 1", pub_date=datetime(2005, 7, 26))
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cls.a2 = Article.objects.create(headline="Article 2", pub_date=datetime(2005, 7, 27))
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cls.a3 = Article.objects.create(headline="Article 3", pub_date=datetime(2005, 7, 27))
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cls.a4 = Article.objects.create(headline="Article 4", pub_date=datetime(2005, 7, 28))
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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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"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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"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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"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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"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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"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(F("author").desc(nulls_last=True, nulls_first=True))
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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.assertSequenceEqual(
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Article.objects.order_by(F("author").desc(nulls_last=True)),
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[self.a4, self.a3, self.a1, self.a2],
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)
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self.assertSequenceEqual(
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Article.objects.order_by(F("author").asc(nulls_last=True)),
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[self.a3, self.a4, self.a1, self.a2],
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)
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self.assertSequenceEqual(
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Article.objects.order_by(Upper("author__name").desc(nulls_last=True)),
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[self.a4, self.a3, self.a1, self.a2],
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)
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self.assertSequenceEqual(
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Article.objects.order_by(Upper("author__name").asc(nulls_last=True)),
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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.assertSequenceEqual(
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Article.objects.order_by(F("author").asc(nulls_first=True)),
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[self.a1, self.a2, self.a3, self.a4],
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)
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self.assertSequenceEqual(
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Article.objects.order_by(F("author").desc(nulls_first=True)),
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[self.a1, self.a2, self.a4, self.a3],
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)
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self.assertSequenceEqual(
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Article.objects.order_by(Upper("author__name").asc(nulls_first=True)),
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[self.a1, self.a2, self.a3, self.a4],
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)
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self.assertSequenceEqual(
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Article.objects.order_by(Upper("author__name").desc(nulls_first=True)),
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[self.a1, self.a2, self.a4, self.a3],
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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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"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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"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(
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len(list(Article.objects.order_by("?"))), 4
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)
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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.all().reverse()[:2], [
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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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qs1, [
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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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qs2, [
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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_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(select={"foo": "pub_date"}, order_by=["foo", "headline"]), [
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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(select={"order": "pub_date"}, order_by=["order", "headline"]), [
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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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"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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"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.assertQuerysetEqual(
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Author.objects.all(),
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list(reversed(range(1, Author.objects.count() + 1))),
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attrgetter("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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for i in range(1, 5):
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author = Author.objects.get(pk=i)
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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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"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(self):
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self.assertQuerysetEqual(
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Article.objects.order_by(F('headline')), [
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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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"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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"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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"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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"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_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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