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fe54377dae
Thanks a lot to everybody participating in developing this feature. The patch was developed by multiple people, at least Trac aliases tonnzor, jimmysong, Fandekasp and slurms. Stylistic changes added by committer.
124 lines
4.8 KiB
Python
124 lines
4.8 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 EarliestOrLatestTests(TestCase):
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"""Tests for the earliest() and latest() objects methods"""
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def tearDown(self):
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"""Makes sure Article has a get_latest_by"""
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if not Article._meta.get_latest_by:
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Article._meta.get_latest_by = 'pub_date'
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def test_earliest(self):
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# Because no Articles exist yet, earliest() raises ArticleDoesNotExist.
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self.assertRaises(Article.DoesNotExist, Article.objects.earliest)
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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, 28),
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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 earliest Article.
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self.assertEqual(Article.objects.earliest(), a1)
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# Get the earliest Article that matches certain filters.
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self.assertEqual(
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Article.objects.filter(pub_date__gt=datetime(2005, 7, 26)).earliest(),
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a2
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)
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# Pass a custom field name to earliest() to change the field that's used
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# to determine the earliest object.
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self.assertEqual(Article.objects.earliest('expire_date'), a2)
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self.assertEqual(Article.objects.filter(
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pub_date__gt=datetime(2005, 7, 26)).earliest('expire_date'), a2)
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# Ensure that earliest() overrides any other ordering specified on the
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# query. Refs #11283.
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self.assertEqual(Article.objects.order_by('id').earliest(), a1)
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# Ensure that error is raised if the user forgot to add a get_latest_by
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# in the Model.Meta
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Article.objects.model._meta.get_latest_by = None
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self.assertRaisesMessage(
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AssertionError,
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"earliest() and latest() require either a field_name parameter or "
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"'get_latest_by' in the model",
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lambda: Article.objects.earliest(),
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)
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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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# Ensure that error is raised if the user forgot to add a get_latest_by
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# in the Model.Meta
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Article.objects.model._meta.get_latest_by = None
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self.assertRaisesMessage(
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AssertionError,
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"earliest() and latest() require either a field_name parameter or "
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"'get_latest_by' in the model",
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lambda: Article.objects.latest(),
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)
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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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