138 lines
4.2 KiB
Python
138 lines
4.2 KiB
Python
from datetime import datetime
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from operator import attrgetter
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from django.test import TestCase
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from models import Article
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class OrderingTests(TestCase):
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def test_basic(self):
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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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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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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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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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# By default, Article.objects.all() orders by pub_date descending, then
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# headline ascending.
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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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# 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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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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# Only the last order_by has any effect (since they each override any
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# previous ordering).
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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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# Use the 'stop' part of slicing notation to limit the results.
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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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# Use the 'stop' and 'start' parts of slicing notation to offset the
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# result list.
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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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# Getting a single item should work too:
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self.assertEqual(Article.objects.all()[0], a4)
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# Use '?' to order randomly.
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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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# 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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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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# Ordering can be based on fields included from an 'extra' clause
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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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# 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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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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