59 lines
2.2 KiB
Python
59 lines
2.2 KiB
Python
from __future__ import absolute_import
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from datetime import datetime
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from django.test import TestCase
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from .models import Article, Person
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class LatestTests(TestCase):
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def test_latest(self):
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# Because no Articles exist yet, latest() raises ArticleDoesNotExist.
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self.assertRaises(Article.DoesNotExist, Article.objects.latest)
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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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expire_date=datetime(2005, 9, 1)
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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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expire_date=datetime(2005, 7, 28)
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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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expire_date=datetime(2005, 8, 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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expire_date=datetime(2005, 7, 30)
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)
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# Get the latest Article.
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self.assertEqual(Article.objects.latest(), a4)
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# Get the latest Article that matches certain filters.
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self.assertEqual(
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Article.objects.filter(pub_date__lt=datetime(2005, 7, 27)).latest(),
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a1
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)
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# Pass a custom field name to latest() to change the field that's used
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# to determine the latest object.
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self.assertEqual(Article.objects.latest('expire_date'), a1)
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self.assertEqual(
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Article.objects.filter(pub_date__gt=datetime(2005, 7, 26)).latest('expire_date'),
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a3,
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)
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# Ensure that latest() overrides any other ordering specified on the query. Refs #11283.
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self.assertEqual(Article.objects.order_by('id').latest(), a4)
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def test_latest_manual(self):
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# You can still use latest() with a model that doesn't have
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# "get_latest_by" set -- just pass in the field name manually.
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p1 = Person.objects.create(name="Ralph", birthday=datetime(1950, 1, 1))
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p2 = Person.objects.create(name="Stephanie", birthday=datetime(1960, 2, 3))
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self.assertRaises(AssertionError, Person.objects.latest)
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self.assertEqual(Person.objects.latest("birthday"), p2)
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