170 lines
6.7 KiB
Python
170 lines
6.7 KiB
Python
from __future__ import unicode_literals
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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, IndexErrorArticle, 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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with self.assertRaises(Article.DoesNotExist):
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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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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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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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# earliest() overrides any other ordering specified on the query.
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# Refs #11283.
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self.assertEqual(Article.objects.order_by('id').earliest(), a1)
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# 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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with 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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):
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Article.objects.earliest()
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def test_latest(self):
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# Because no Articles exist yet, latest() raises ArticleDoesNotExist.
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with self.assertRaises(Article.DoesNotExist):
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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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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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# latest() overrides any other ordering specified on the query (#11283).
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self.assertEqual(Article.objects.order_by('id').latest(), a4)
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# Error is raised if get_latest_by isn't in Model.Meta.
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Article.objects.model._meta.get_latest_by = None
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with 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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):
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Article.objects.latest()
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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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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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with self.assertRaises(AssertionError):
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Person.objects.latest()
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self.assertEqual(Person.objects.latest("birthday"), p2)
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class TestFirstLast(TestCase):
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def test_first(self):
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p1 = Person.objects.create(name="Bob", birthday=datetime(1950, 1, 1))
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p2 = Person.objects.create(name="Alice", birthday=datetime(1961, 2, 3))
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self.assertEqual(Person.objects.first(), p1)
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self.assertEqual(Person.objects.order_by('name').first(), p2)
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self.assertEqual(Person.objects.filter(birthday__lte=datetime(1955, 1, 1)).first(), p1)
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self.assertIsNone(Person.objects.filter(birthday__lte=datetime(1940, 1, 1)).first())
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def test_last(self):
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p1 = Person.objects.create(name="Alice", birthday=datetime(1950, 1, 1))
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p2 = Person.objects.create(name="Bob", birthday=datetime(1960, 2, 3))
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# Note: by default PK ordering.
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self.assertEqual(Person.objects.last(), p2)
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self.assertEqual(Person.objects.order_by('-name').last(), p1)
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self.assertEqual(Person.objects.filter(birthday__lte=datetime(1955, 1, 1)).last(), p1)
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self.assertIsNone(Person.objects.filter(birthday__lte=datetime(1940, 1, 1)).last())
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def test_index_error_not_suppressed(self):
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"""
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#23555 -- Unexpected IndexError exceptions in QuerySet iteration
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shouldn't be suppressed.
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"""
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def check():
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# We know that we've broken the __iter__ method, so the queryset
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# should always raise an exception.
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with self.assertRaises(IndexError):
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IndexErrorArticle.objects.all()[0]
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with self.assertRaises(IndexError):
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IndexErrorArticle.objects.all().first()
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with self.assertRaises(IndexError):
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IndexErrorArticle.objects.all().last()
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check()
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# And it does not matter if there are any records in the DB.
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IndexErrorArticle.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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check()
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