267 lines
9.7 KiB
Python
267 lines
9.7 KiB
Python
from datetime import datetime
|
|
|
|
from django.db.models import Avg
|
|
from django.test import TestCase
|
|
|
|
from .models import Article, Comment, IndexErrorArticle, Person
|
|
|
|
|
|
class EarliestOrLatestTests(TestCase):
|
|
"""Tests for the earliest() and latest() objects methods"""
|
|
|
|
@classmethod
|
|
def setUpClass(cls):
|
|
super().setUpClass()
|
|
cls._article_get_latest_by = Article._meta.get_latest_by
|
|
|
|
def tearDown(self):
|
|
Article._meta.get_latest_by = self._article_get_latest_by
|
|
|
|
def test_earliest(self):
|
|
# Because no Articles exist yet, earliest() raises ArticleDoesNotExist.
|
|
with self.assertRaises(Article.DoesNotExist):
|
|
Article.objects.earliest()
|
|
|
|
a1 = Article.objects.create(
|
|
headline="Article 1",
|
|
pub_date=datetime(2005, 7, 26),
|
|
expire_date=datetime(2005, 9, 1),
|
|
)
|
|
a2 = Article.objects.create(
|
|
headline="Article 2",
|
|
pub_date=datetime(2005, 7, 27),
|
|
expire_date=datetime(2005, 7, 28),
|
|
)
|
|
a3 = Article.objects.create(
|
|
headline="Article 3",
|
|
pub_date=datetime(2005, 7, 28),
|
|
expire_date=datetime(2005, 8, 27),
|
|
)
|
|
a4 = Article.objects.create(
|
|
headline="Article 4",
|
|
pub_date=datetime(2005, 7, 28),
|
|
expire_date=datetime(2005, 7, 30),
|
|
)
|
|
|
|
# Get the earliest Article.
|
|
self.assertEqual(Article.objects.earliest(), a1)
|
|
# Get the earliest Article that matches certain filters.
|
|
self.assertEqual(
|
|
Article.objects.filter(pub_date__gt=datetime(2005, 7, 26)).earliest(), a2
|
|
)
|
|
|
|
# Pass a custom field name to earliest() to change the field that's used
|
|
# to determine the earliest object.
|
|
self.assertEqual(Article.objects.earliest("expire_date"), a2)
|
|
self.assertEqual(
|
|
Article.objects.filter(pub_date__gt=datetime(2005, 7, 26)).earliest(
|
|
"expire_date"
|
|
),
|
|
a2,
|
|
)
|
|
|
|
# earliest() overrides any other ordering specified on the query.
|
|
# Refs #11283.
|
|
self.assertEqual(Article.objects.order_by("id").earliest(), a1)
|
|
|
|
# Error is raised if the user forgot to add a get_latest_by
|
|
# in the Model.Meta
|
|
Article.objects.model._meta.get_latest_by = None
|
|
with self.assertRaisesMessage(
|
|
ValueError,
|
|
"earliest() and latest() require either fields as positional "
|
|
"arguments or 'get_latest_by' in the model's Meta.",
|
|
):
|
|
Article.objects.earliest()
|
|
|
|
# Earliest publication date, earliest expire date.
|
|
self.assertEqual(
|
|
Article.objects.filter(pub_date=datetime(2005, 7, 28)).earliest(
|
|
"pub_date", "expire_date"
|
|
),
|
|
a4,
|
|
)
|
|
# Earliest publication date, latest expire date.
|
|
self.assertEqual(
|
|
Article.objects.filter(pub_date=datetime(2005, 7, 28)).earliest(
|
|
"pub_date", "-expire_date"
|
|
),
|
|
a3,
|
|
)
|
|
|
|
# Meta.get_latest_by may be a tuple.
|
|
Article.objects.model._meta.get_latest_by = ("pub_date", "expire_date")
|
|
self.assertEqual(
|
|
Article.objects.filter(pub_date=datetime(2005, 7, 28)).earliest(), a4
|
|
)
|
|
|
|
def test_earliest_sliced_queryset(self):
|
|
msg = "Cannot change a query once a slice has been taken."
|
|
with self.assertRaisesMessage(TypeError, msg):
|
|
Article.objects.all()[0:5].earliest()
|
|
|
|
def test_latest(self):
|
|
# Because no Articles exist yet, latest() raises ArticleDoesNotExist.
|
|
with self.assertRaises(Article.DoesNotExist):
|
|
Article.objects.latest()
|
|
|
|
a1 = Article.objects.create(
|
|
headline="Article 1",
|
|
pub_date=datetime(2005, 7, 26),
|
|
expire_date=datetime(2005, 9, 1),
|
|
)
|
|
a2 = Article.objects.create(
|
|
headline="Article 2",
|
|
pub_date=datetime(2005, 7, 27),
|
|
expire_date=datetime(2005, 7, 28),
|
|
)
|
|
a3 = Article.objects.create(
|
|
headline="Article 3",
|
|
pub_date=datetime(2005, 7, 27),
|
|
expire_date=datetime(2005, 8, 27),
|
|
)
|
|
a4 = Article.objects.create(
|
|
headline="Article 4",
|
|
pub_date=datetime(2005, 7, 28),
|
|
expire_date=datetime(2005, 7, 30),
|
|
)
|
|
|
|
# Get the latest Article.
|
|
self.assertEqual(Article.objects.latest(), a4)
|
|
# Get the latest Article that matches certain filters.
|
|
self.assertEqual(
|
|
Article.objects.filter(pub_date__lt=datetime(2005, 7, 27)).latest(), a1
|
|
)
|
|
|
|
# Pass a custom field name to latest() to change the field that's used
|
|
# to determine the latest object.
|
|
self.assertEqual(Article.objects.latest("expire_date"), a1)
|
|
self.assertEqual(
|
|
Article.objects.filter(pub_date__gt=datetime(2005, 7, 26)).latest(
|
|
"expire_date"
|
|
),
|
|
a3,
|
|
)
|
|
|
|
# latest() overrides any other ordering specified on the query (#11283).
|
|
self.assertEqual(Article.objects.order_by("id").latest(), a4)
|
|
|
|
# Error is raised if get_latest_by isn't in Model.Meta.
|
|
Article.objects.model._meta.get_latest_by = None
|
|
with self.assertRaisesMessage(
|
|
ValueError,
|
|
"earliest() and latest() require either fields as positional "
|
|
"arguments or 'get_latest_by' in the model's Meta.",
|
|
):
|
|
Article.objects.latest()
|
|
|
|
# Latest publication date, latest expire date.
|
|
self.assertEqual(
|
|
Article.objects.filter(pub_date=datetime(2005, 7, 27)).latest(
|
|
"pub_date", "expire_date"
|
|
),
|
|
a3,
|
|
)
|
|
# Latest publication date, earliest expire date.
|
|
self.assertEqual(
|
|
Article.objects.filter(pub_date=datetime(2005, 7, 27)).latest(
|
|
"pub_date", "-expire_date"
|
|
),
|
|
a2,
|
|
)
|
|
|
|
# Meta.get_latest_by may be a tuple.
|
|
Article.objects.model._meta.get_latest_by = ("pub_date", "expire_date")
|
|
self.assertEqual(
|
|
Article.objects.filter(pub_date=datetime(2005, 7, 27)).latest(), a3
|
|
)
|
|
|
|
def test_latest_sliced_queryset(self):
|
|
msg = "Cannot change a query once a slice has been taken."
|
|
with self.assertRaisesMessage(TypeError, msg):
|
|
Article.objects.all()[0:5].latest()
|
|
|
|
def test_latest_manual(self):
|
|
# You can still use latest() with a model that doesn't have
|
|
# "get_latest_by" set -- just pass in the field name manually.
|
|
Person.objects.create(name="Ralph", birthday=datetime(1950, 1, 1))
|
|
p2 = Person.objects.create(name="Stephanie", birthday=datetime(1960, 2, 3))
|
|
msg = (
|
|
"earliest() and latest() require either fields as positional arguments "
|
|
"or 'get_latest_by' in the model's Meta."
|
|
)
|
|
with self.assertRaisesMessage(ValueError, msg):
|
|
Person.objects.latest()
|
|
self.assertEqual(Person.objects.latest("birthday"), p2)
|
|
|
|
|
|
class TestFirstLast(TestCase):
|
|
def test_first(self):
|
|
p1 = Person.objects.create(name="Bob", birthday=datetime(1950, 1, 1))
|
|
p2 = Person.objects.create(name="Alice", birthday=datetime(1961, 2, 3))
|
|
self.assertEqual(Person.objects.first(), p1)
|
|
self.assertEqual(Person.objects.order_by("name").first(), p2)
|
|
self.assertEqual(
|
|
Person.objects.filter(birthday__lte=datetime(1955, 1, 1)).first(), p1
|
|
)
|
|
self.assertIsNone(
|
|
Person.objects.filter(birthday__lte=datetime(1940, 1, 1)).first()
|
|
)
|
|
|
|
def test_last(self):
|
|
p1 = Person.objects.create(name="Alice", birthday=datetime(1950, 1, 1))
|
|
p2 = Person.objects.create(name="Bob", birthday=datetime(1960, 2, 3))
|
|
# Note: by default PK ordering.
|
|
self.assertEqual(Person.objects.last(), p2)
|
|
self.assertEqual(Person.objects.order_by("-name").last(), p1)
|
|
self.assertEqual(
|
|
Person.objects.filter(birthday__lte=datetime(1955, 1, 1)).last(), p1
|
|
)
|
|
self.assertIsNone(
|
|
Person.objects.filter(birthday__lte=datetime(1940, 1, 1)).last()
|
|
)
|
|
|
|
def test_index_error_not_suppressed(self):
|
|
"""
|
|
#23555 -- Unexpected IndexError exceptions in QuerySet iteration
|
|
shouldn't be suppressed.
|
|
"""
|
|
|
|
def check():
|
|
# We know that we've broken the __iter__ method, so the queryset
|
|
# should always raise an exception.
|
|
with self.assertRaises(IndexError):
|
|
IndexErrorArticle.objects.all()[:10:2]
|
|
with self.assertRaises(IndexError):
|
|
IndexErrorArticle.objects.first()
|
|
with self.assertRaises(IndexError):
|
|
IndexErrorArticle.objects.last()
|
|
|
|
check()
|
|
|
|
# And it does not matter if there are any records in the DB.
|
|
IndexErrorArticle.objects.create(
|
|
headline="Article 1",
|
|
pub_date=datetime(2005, 7, 26),
|
|
expire_date=datetime(2005, 9, 1),
|
|
)
|
|
check()
|
|
|
|
def test_first_last_unordered_qs_aggregation_error(self):
|
|
a1 = Article.objects.create(
|
|
headline="Article 1",
|
|
pub_date=datetime(2005, 7, 26),
|
|
expire_date=datetime(2005, 9, 1),
|
|
)
|
|
Comment.objects.create(article=a1, likes_count=5)
|
|
|
|
qs = Comment.objects.values("article").annotate(avg_likes=Avg("likes_count"))
|
|
msg = (
|
|
"Cannot use QuerySet.%s() on an unordered queryset performing aggregation. "
|
|
"Add an ordering with order_by()."
|
|
)
|
|
with self.assertRaisesMessage(TypeError, msg % "first"):
|
|
qs.first()
|
|
with self.assertRaisesMessage(TypeError, msg % "last"):
|
|
qs.last()
|