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267 lines
9.7 KiB
Python
267 lines
9.7 KiB
Python
from datetime import datetime
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from django.db.models import Avg
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from django.test import TestCase
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from .models import Article, Comment, 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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@classmethod
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def setUpClass(cls):
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super().setUpClass()
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cls._article_get_latest_by = Article._meta.get_latest_by
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def tearDown(self):
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Article._meta.get_latest_by = self._article_get_latest_by
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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",
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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",
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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",
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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",
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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(), 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(
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Article.objects.filter(pub_date__gt=datetime(2005, 7, 26)).earliest(
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"expire_date"
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),
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a2,
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)
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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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ValueError,
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"earliest() and latest() require either fields as positional "
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"arguments or 'get_latest_by' in the model's Meta.",
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):
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Article.objects.earliest()
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# Earliest publication date, earliest expire date.
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self.assertEqual(
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Article.objects.filter(pub_date=datetime(2005, 7, 28)).earliest(
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"pub_date", "expire_date"
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),
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a4,
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)
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# Earliest publication date, latest expire date.
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self.assertEqual(
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Article.objects.filter(pub_date=datetime(2005, 7, 28)).earliest(
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"pub_date", "-expire_date"
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),
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a3,
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)
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# Meta.get_latest_by may be a tuple.
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Article.objects.model._meta.get_latest_by = ("pub_date", "expire_date")
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self.assertEqual(
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Article.objects.filter(pub_date=datetime(2005, 7, 28)).earliest(), a4
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)
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def test_earliest_sliced_queryset(self):
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msg = "Cannot change a query once a slice has been taken."
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with self.assertRaisesMessage(TypeError, msg):
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Article.objects.all()[0:5].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",
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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",
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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",
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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",
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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(), 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(
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"expire_date"
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),
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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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ValueError,
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"earliest() and latest() require either fields as positional "
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"arguments or 'get_latest_by' in the model's Meta.",
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):
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Article.objects.latest()
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# Latest publication date, latest expire date.
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self.assertEqual(
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Article.objects.filter(pub_date=datetime(2005, 7, 27)).latest(
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"pub_date", "expire_date"
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),
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a3,
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)
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# Latest publication date, earliest expire date.
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self.assertEqual(
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Article.objects.filter(pub_date=datetime(2005, 7, 27)).latest(
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"pub_date", "-expire_date"
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),
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a2,
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)
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# Meta.get_latest_by may be a tuple.
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Article.objects.model._meta.get_latest_by = ("pub_date", "expire_date")
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self.assertEqual(
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Article.objects.filter(pub_date=datetime(2005, 7, 27)).latest(), a3
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)
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def test_latest_sliced_queryset(self):
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msg = "Cannot change a query once a slice has been taken."
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with self.assertRaisesMessage(TypeError, msg):
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Article.objects.all()[0:5].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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msg = (
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"earliest() and latest() require either fields as positional arguments "
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"or 'get_latest_by' in the model's Meta."
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)
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with self.assertRaisesMessage(ValueError, msg):
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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(
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Person.objects.filter(birthday__lte=datetime(1955, 1, 1)).first(), p1
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)
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self.assertIsNone(
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Person.objects.filter(birthday__lte=datetime(1940, 1, 1)).first()
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)
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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(
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Person.objects.filter(birthday__lte=datetime(1955, 1, 1)).last(), p1
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)
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self.assertIsNone(
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Person.objects.filter(birthday__lte=datetime(1940, 1, 1)).last()
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)
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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()[:10:2]
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with self.assertRaises(IndexError):
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IndexErrorArticle.objects.first()
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with self.assertRaises(IndexError):
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IndexErrorArticle.objects.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",
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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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def test_first_last_unordered_qs_aggregation_error(self):
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a1 = Article.objects.create(
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headline="Article 1",
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pub_date=datetime(2005, 7, 26),
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expire_date=datetime(2005, 9, 1),
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)
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Comment.objects.create(article=a1, likes_count=5)
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qs = Comment.objects.values("article").annotate(avg_likes=Avg("likes_count"))
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msg = (
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"Cannot use QuerySet.%s() on an unordered queryset performing aggregation. "
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"Add an ordering with order_by()."
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)
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with self.assertRaisesMessage(TypeError, msg % "first"):
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qs.first()
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with self.assertRaisesMessage(TypeError, msg % "last"):
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qs.last()
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