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310 lines
9.1 KiB
Python
310 lines
9.1 KiB
Python
from __future__ import unicode_literals
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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.test import TestCase
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from .models import Article, Author
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class OrderingTests(TestCase):
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def setUp(self):
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self.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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self.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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self.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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self.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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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_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_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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Ensure that 'pk' works as an ordering option in Meta.
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Refs #8291.
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"""
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Author.objects.create(pk=1)
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Author.objects.create(pk=2)
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Author.objects.create(pk=3)
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Author.objects.create(pk=4)
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self.assertQuerysetEqual(
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Author.objects.all(), [
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4, 3, 2, 1
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],
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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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Ensure that ordering by a foreign key by its attribute name prevents
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the query from inheriting it's related model ordering option.
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Refs #19195.
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"""
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for i in range(1, 5):
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author = Author.objects.create(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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