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653 lines
30 KiB
Python
653 lines
30 KiB
Python
import datetime
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from copy import deepcopy
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from django.core.exceptions import FieldError, MultipleObjectsReturned
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from django.db import models, transaction
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from django.db.utils import IntegrityError
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from django.test import TestCase
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from django.utils.translation import gettext_lazy
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from .models import (
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Article, Category, Child, City, District, First, Parent, Record, Relation,
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Reporter, School, Student, Third, ToFieldChild,
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)
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class ManyToOneTests(TestCase):
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def setUp(self):
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# Create a few Reporters.
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self.r = Reporter(first_name='John', last_name='Smith', email='john@example.com')
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self.r.save()
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self.r2 = Reporter(first_name='Paul', last_name='Jones', email='paul@example.com')
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self.r2.save()
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# Create an Article.
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self.a = Article(headline="This is a test", pub_date=datetime.date(2005, 7, 27), reporter=self.r)
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self.a.save()
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def test_get(self):
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# Article objects have access to their related Reporter objects.
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r = self.a.reporter
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self.assertEqual(r.id, self.r.id)
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self.assertEqual((r.first_name, self.r.last_name), ('John', 'Smith'))
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def test_create(self):
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# You can also instantiate an Article by passing the Reporter's ID
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# instead of a Reporter object.
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a3 = Article(headline="Third article", pub_date=datetime.date(2005, 7, 27), reporter_id=self.r.id)
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a3.save()
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self.assertEqual(a3.reporter.id, self.r.id)
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# Similarly, the reporter ID can be a string.
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a4 = Article(headline="Fourth article", pub_date=datetime.date(2005, 7, 27), reporter_id=str(self.r.id))
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a4.save()
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self.assertEqual(repr(a4.reporter), "<Reporter: John Smith>")
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def test_add(self):
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# Create an Article via the Reporter object.
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new_article = self.r.article_set.create(headline="John's second story", pub_date=datetime.date(2005, 7, 29))
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self.assertEqual(repr(new_article), "<Article: John's second story>")
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self.assertEqual(new_article.reporter.id, self.r.id)
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# Create a new article, and add it to the article set.
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new_article2 = Article(headline="Paul's story", pub_date=datetime.date(2006, 1, 17))
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msg = "<Article: Paul's story> instance isn't saved. Use bulk=False or save the object first."
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with self.assertRaisesMessage(ValueError, msg):
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self.r.article_set.add(new_article2)
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self.r.article_set.add(new_article2, bulk=False)
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self.assertEqual(new_article2.reporter.id, self.r.id)
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self.assertQuerysetEqual(
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self.r.article_set.all(),
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["<Article: John's second story>", "<Article: Paul's story>", "<Article: This is a test>"]
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)
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# Add the same article to a different article set - check that it moves.
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self.r2.article_set.add(new_article2)
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self.assertEqual(new_article2.reporter.id, self.r2.id)
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self.assertQuerysetEqual(self.r2.article_set.all(), ["<Article: Paul's story>"])
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# Adding an object of the wrong type raises TypeError.
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with transaction.atomic():
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with self.assertRaisesMessage(TypeError, "'Article' instance expected, got <Reporter:"):
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self.r.article_set.add(self.r2)
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self.assertQuerysetEqual(
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self.r.article_set.all(),
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["<Article: John's second story>", "<Article: This is a test>"]
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)
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def test_set(self):
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new_article = self.r.article_set.create(headline="John's second story", pub_date=datetime.date(2005, 7, 29))
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new_article2 = self.r2.article_set.create(headline="Paul's story", pub_date=datetime.date(2006, 1, 17))
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# Assign the article to the reporter.
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new_article2.reporter = self.r
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new_article2.save()
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self.assertEqual(repr(new_article2.reporter), "<Reporter: John Smith>")
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self.assertEqual(new_article2.reporter.id, self.r.id)
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self.assertQuerysetEqual(self.r.article_set.all(), [
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"<Article: John's second story>",
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"<Article: Paul's story>",
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"<Article: This is a test>",
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])
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self.assertQuerysetEqual(self.r2.article_set.all(), [])
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# Set the article back again.
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self.r2.article_set.set([new_article, new_article2])
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self.assertQuerysetEqual(self.r.article_set.all(), ["<Article: This is a test>"])
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self.assertQuerysetEqual(
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self.r2.article_set.all(),
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["<Article: John's second story>", "<Article: Paul's story>"]
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)
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# Funny case - because the ForeignKey cannot be null,
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# existing members of the set must remain.
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self.r.article_set.set([new_article])
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self.assertQuerysetEqual(
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self.r.article_set.all(),
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["<Article: John's second story>", "<Article: This is a test>"]
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)
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self.assertQuerysetEqual(self.r2.article_set.all(), ["<Article: Paul's story>"])
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def test_reverse_assignment_deprecation(self):
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msg = (
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"Direct assignment to the reverse side of a related set is "
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"prohibited. Use article_set.set() instead."
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)
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with self.assertRaisesMessage(TypeError, msg):
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self.r2.article_set = []
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def test_assign(self):
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new_article = self.r.article_set.create(headline="John's second story", pub_date=datetime.date(2005, 7, 29))
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new_article2 = self.r2.article_set.create(headline="Paul's story", pub_date=datetime.date(2006, 1, 17))
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# Assign the article to the reporter directly using the descriptor.
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new_article2.reporter = self.r
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new_article2.save()
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self.assertEqual(repr(new_article2.reporter), "<Reporter: John Smith>")
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self.assertEqual(new_article2.reporter.id, self.r.id)
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self.assertQuerysetEqual(self.r.article_set.all(), [
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"<Article: John's second story>",
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"<Article: Paul's story>",
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"<Article: This is a test>",
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])
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self.assertQuerysetEqual(self.r2.article_set.all(), [])
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# Set the article back again using set() method.
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self.r2.article_set.set([new_article, new_article2])
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self.assertQuerysetEqual(self.r.article_set.all(), ["<Article: This is a test>"])
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self.assertQuerysetEqual(
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self.r2.article_set.all(),
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["<Article: John's second story>", "<Article: Paul's story>"]
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)
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# Because the ForeignKey cannot be null, existing members of the set
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# must remain.
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self.r.article_set.set([new_article])
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self.assertQuerysetEqual(
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self.r.article_set.all(),
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["<Article: John's second story>", "<Article: This is a test>"]
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)
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self.assertQuerysetEqual(self.r2.article_set.all(), ["<Article: Paul's story>"])
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# Reporter cannot be null - there should not be a clear or remove method
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self.assertFalse(hasattr(self.r2.article_set, 'remove'))
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self.assertFalse(hasattr(self.r2.article_set, 'clear'))
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def test_selects(self):
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self.r.article_set.create(headline="John's second story", pub_date=datetime.date(2005, 7, 29))
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self.r2.article_set.create(headline="Paul's story", pub_date=datetime.date(2006, 1, 17))
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# Reporter objects have access to their related Article objects.
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self.assertQuerysetEqual(self.r.article_set.all(), [
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"<Article: John's second story>",
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"<Article: This is a test>",
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])
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self.assertQuerysetEqual(self.r.article_set.filter(headline__startswith='This'), ["<Article: This is a test>"])
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self.assertEqual(self.r.article_set.count(), 2)
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self.assertEqual(self.r2.article_set.count(), 1)
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# Get articles by id
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self.assertQuerysetEqual(Article.objects.filter(id__exact=self.a.id), ["<Article: This is a test>"])
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self.assertQuerysetEqual(Article.objects.filter(pk=self.a.id), ["<Article: This is a test>"])
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# Query on an article property
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self.assertQuerysetEqual(Article.objects.filter(headline__startswith='This'), ["<Article: This is a test>"])
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# The API automatically follows relationships as far as you need.
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# Use double underscores to separate relationships.
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# This works as many levels deep as you want. There's no limit.
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# Find all Articles for any Reporter whose first name is "John".
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self.assertQuerysetEqual(
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Article.objects.filter(reporter__first_name__exact='John'),
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["<Article: John's second story>", "<Article: This is a test>"]
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)
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# Implied __exact also works
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self.assertQuerysetEqual(
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Article.objects.filter(reporter__first_name='John'),
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["<Article: John's second story>", "<Article: This is a test>"]
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)
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# Query twice over the related field.
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self.assertQuerysetEqual(
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Article.objects.filter(reporter__first_name__exact='John', reporter__last_name__exact='Smith'),
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["<Article: John's second story>", "<Article: This is a test>"]
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)
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# The underlying query only makes one join when a related table is referenced twice.
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queryset = Article.objects.filter(reporter__first_name__exact='John', reporter__last_name__exact='Smith')
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self.assertNumQueries(1, list, queryset)
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self.assertEqual(queryset.query.get_compiler(queryset.db).as_sql()[0].count('INNER JOIN'), 1)
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# The automatically joined table has a predictable name.
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self.assertQuerysetEqual(
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Article.objects.filter(reporter__first_name__exact='John').extra(
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where=["many_to_one_reporter.last_name='Smith'"]),
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["<Article: John's second story>", "<Article: This is a test>"]
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)
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# ... and should work fine with the string that comes out of forms.Form.cleaned_data
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self.assertQuerysetEqual(
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(Article.objects
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.filter(reporter__first_name__exact='John')
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.extra(where=["many_to_one_reporter.last_name='%s'" % 'Smith'])),
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["<Article: John's second story>", "<Article: This is a test>"]
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)
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# Find all Articles for a Reporter.
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# Use direct ID check, pk check, and object comparison
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self.assertQuerysetEqual(
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Article.objects.filter(reporter__id__exact=self.r.id),
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[
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"<Article: John's second story>",
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"<Article: This is a test>",
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])
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self.assertQuerysetEqual(
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Article.objects.filter(reporter__pk=self.r.id),
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[
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"<Article: John's second story>",
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"<Article: This is a test>",
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])
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self.assertQuerysetEqual(
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Article.objects.filter(reporter=self.r.id),
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[
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"<Article: John's second story>",
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"<Article: This is a test>",
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])
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self.assertQuerysetEqual(
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Article.objects.filter(reporter=self.r),
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[
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"<Article: John's second story>",
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"<Article: This is a test>",
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])
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self.assertQuerysetEqual(
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Article.objects.filter(reporter__in=[self.r.id, self.r2.id]).distinct(),
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[
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"<Article: John's second story>",
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"<Article: Paul's story>",
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"<Article: This is a test>",
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])
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self.assertQuerysetEqual(
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Article.objects.filter(reporter__in=[self.r, self.r2]).distinct(),
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[
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"<Article: John's second story>",
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"<Article: Paul's story>",
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"<Article: This is a test>",
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])
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# You can also use a queryset instead of a literal list of instances.
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# The queryset must be reduced to a list of values using values(),
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# then converted into a query
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self.assertQuerysetEqual(
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Article.objects.filter(
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reporter__in=Reporter.objects.filter(first_name='John').values('pk').query
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).distinct(),
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[
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"<Article: John's second story>",
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"<Article: This is a test>",
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])
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def test_reverse_selects(self):
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a3 = Article.objects.create(
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headline="Third article",
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pub_date=datetime.date(2005, 7, 27),
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reporter_id=self.r.id,
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)
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Article.objects.create(
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headline="Fourth article",
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pub_date=datetime.date(2005, 7, 27),
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reporter_id=self.r.id,
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)
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john_smith = ["<Reporter: John Smith>"]
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# Reporters can be queried
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self.assertQuerysetEqual(Reporter.objects.filter(id__exact=self.r.id), john_smith)
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self.assertQuerysetEqual(Reporter.objects.filter(pk=self.r.id), john_smith)
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self.assertQuerysetEqual(Reporter.objects.filter(first_name__startswith='John'), john_smith)
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# Reporters can query in opposite direction of ForeignKey definition
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self.assertQuerysetEqual(Reporter.objects.filter(article__id__exact=self.a.id), john_smith)
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self.assertQuerysetEqual(Reporter.objects.filter(article__pk=self.a.id), john_smith)
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self.assertQuerysetEqual(Reporter.objects.filter(article=self.a.id), john_smith)
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self.assertQuerysetEqual(Reporter.objects.filter(article=self.a), john_smith)
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self.assertQuerysetEqual(Reporter.objects.filter(article__in=[self.a.id, a3.id]).distinct(), john_smith)
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self.assertQuerysetEqual(Reporter.objects.filter(article__in=[self.a.id, a3]).distinct(), john_smith)
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self.assertQuerysetEqual(Reporter.objects.filter(article__in=[self.a, a3]).distinct(), john_smith)
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self.assertQuerysetEqual(
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Reporter.objects.filter(article__headline__startswith='T'),
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["<Reporter: John Smith>", "<Reporter: John Smith>"],
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ordered=False
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)
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self.assertQuerysetEqual(Reporter.objects.filter(article__headline__startswith='T').distinct(), john_smith)
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# Counting in the opposite direction works in conjunction with distinct()
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self.assertEqual(Reporter.objects.filter(article__headline__startswith='T').count(), 2)
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self.assertEqual(Reporter.objects.filter(article__headline__startswith='T').distinct().count(), 1)
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# Queries can go round in circles.
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self.assertQuerysetEqual(
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Reporter.objects.filter(article__reporter__first_name__startswith='John'),
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[
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"<Reporter: John Smith>",
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"<Reporter: John Smith>",
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"<Reporter: John Smith>",
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],
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ordered=False
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)
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self.assertQuerysetEqual(
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Reporter.objects.filter(article__reporter__first_name__startswith='John').distinct(),
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john_smith
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)
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self.assertQuerysetEqual(Reporter.objects.filter(article__reporter__exact=self.r).distinct(), john_smith)
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# Implied __exact also works.
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self.assertQuerysetEqual(Reporter.objects.filter(article__reporter=self.r).distinct(), john_smith)
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# It's possible to use values() calls across many-to-one relations.
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# (Note, too, that we clear the ordering here so as not to drag the
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# 'headline' field into the columns being used to determine uniqueness)
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d = {'reporter__first_name': 'John', 'reporter__last_name': 'Smith'}
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qs = Article.objects.filter(
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reporter=self.r,
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).distinct().order_by().values('reporter__first_name', 'reporter__last_name')
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self.assertEqual([d], list(qs))
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def test_select_related(self):
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# Article.objects.select_related().dates() works properly when there
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# are multiple Articles with the same date but different foreign-key
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# objects (Reporters).
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r1 = Reporter.objects.create(first_name='Mike', last_name='Royko', email='royko@suntimes.com')
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r2 = Reporter.objects.create(first_name='John', last_name='Kass', email='jkass@tribune.com')
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Article.objects.create(headline='First', pub_date=datetime.date(1980, 4, 23), reporter=r1)
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Article.objects.create(headline='Second', pub_date=datetime.date(1980, 4, 23), reporter=r2)
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self.assertEqual(
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list(Article.objects.select_related().dates('pub_date', 'day')),
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[datetime.date(1980, 4, 23), datetime.date(2005, 7, 27)]
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)
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self.assertEqual(
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list(Article.objects.select_related().dates('pub_date', 'month')),
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[datetime.date(1980, 4, 1), datetime.date(2005, 7, 1)]
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)
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self.assertEqual(
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list(Article.objects.select_related().dates('pub_date', 'year')),
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[datetime.date(1980, 1, 1), datetime.date(2005, 1, 1)]
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)
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def test_delete(self):
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self.r.article_set.create(headline="John's second story", pub_date=datetime.date(2005, 7, 29))
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self.r2.article_set.create(headline="Paul's story", pub_date=datetime.date(2006, 1, 17))
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Article.objects.create(headline="Third article", pub_date=datetime.date(2005, 7, 27), reporter_id=self.r.id)
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Article.objects.create(
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headline="Fourth article",
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pub_date=datetime.date(2005, 7, 27),
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reporter_id=str(self.r.id),
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)
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# If you delete a reporter, his articles will be deleted.
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self.assertQuerysetEqual(
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Article.objects.all(),
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[
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"<Article: Fourth article>",
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"<Article: John's second story>",
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"<Article: Paul's story>",
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"<Article: Third article>",
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"<Article: This is a test>",
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]
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)
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self.assertQuerysetEqual(
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Reporter.objects.order_by('first_name'),
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["<Reporter: John Smith>", "<Reporter: Paul Jones>"]
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)
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self.r2.delete()
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self.assertQuerysetEqual(
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Article.objects.all(),
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[
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"<Article: Fourth article>",
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"<Article: John's second story>",
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"<Article: Third article>",
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"<Article: This is a test>",
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]
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)
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self.assertQuerysetEqual(Reporter.objects.order_by('first_name'), ["<Reporter: John Smith>"])
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# You can delete using a JOIN in the query.
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Reporter.objects.filter(article__headline__startswith='This').delete()
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self.assertQuerysetEqual(Reporter.objects.all(), [])
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self.assertQuerysetEqual(Article.objects.all(), [])
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def test_explicit_fk(self):
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# Create a new Article with get_or_create using an explicit value
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# for a ForeignKey.
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a2, created = Article.objects.get_or_create(
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headline="John's second test",
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pub_date=datetime.date(2011, 5, 7),
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reporter_id=self.r.id,
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)
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self.assertTrue(created)
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self.assertEqual(a2.reporter.id, self.r.id)
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# You can specify filters containing the explicit FK value.
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self.assertQuerysetEqual(
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Article.objects.filter(reporter_id__exact=self.r.id),
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["<Article: John's second test>", "<Article: This is a test>"]
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)
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# Create an Article by Paul for the same date.
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a3 = Article.objects.create(
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headline="Paul's commentary",
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pub_date=datetime.date(2011, 5, 7),
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reporter_id=self.r2.id,
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)
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self.assertEqual(a3.reporter.id, self.r2.id)
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# Get should respect explicit foreign keys as well.
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with self.assertRaises(MultipleObjectsReturned):
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Article.objects.get(reporter_id=self.r.id)
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self.assertEqual(
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repr(a3),
|
|
repr(Article.objects.get(reporter_id=self.r2.id, pub_date=datetime.date(2011, 5, 7)))
|
|
)
|
|
|
|
def test_deepcopy_and_circular_references(self):
|
|
# Regression for #12876 -- Model methods that include queries that
|
|
# recursive don't cause recursion depth problems under deepcopy.
|
|
self.r.cached_query = Article.objects.filter(reporter=self.r)
|
|
self.assertEqual(repr(deepcopy(self.r)), "<Reporter: John Smith>")
|
|
|
|
def test_manager_class_caching(self):
|
|
r1 = Reporter.objects.create(first_name='Mike')
|
|
r2 = Reporter.objects.create(first_name='John')
|
|
|
|
# Same twice
|
|
self.assertIs(r1.article_set.__class__, r1.article_set.__class__)
|
|
|
|
# Same as each other
|
|
self.assertIs(r1.article_set.__class__, r2.article_set.__class__)
|
|
|
|
def test_create_relation_with_gettext_lazy(self):
|
|
reporter = Reporter.objects.create(first_name='John', last_name='Smith', email='john.smith@example.com')
|
|
lazy = gettext_lazy('test')
|
|
reporter.article_set.create(headline=lazy, pub_date=datetime.date(2011, 6, 10))
|
|
notlazy = str(lazy)
|
|
article = reporter.article_set.get()
|
|
self.assertEqual(article.headline, notlazy)
|
|
|
|
def test_values_list_exception(self):
|
|
expected_message = "Cannot resolve keyword 'notafield' into field. Choices are: %s"
|
|
reporter_fields = ', '.join(sorted(f.name for f in Reporter._meta.get_fields()))
|
|
with self.assertRaisesMessage(FieldError, expected_message % reporter_fields):
|
|
Article.objects.values_list('reporter__notafield')
|
|
article_fields = ', '.join(['EXTRA'] + sorted(f.name for f in Article._meta.get_fields()))
|
|
with self.assertRaisesMessage(FieldError, expected_message % article_fields):
|
|
Article.objects.extra(select={'EXTRA': 'EXTRA_SELECT'}).values_list('notafield')
|
|
|
|
def test_fk_assignment_and_related_object_cache(self):
|
|
# Tests of ForeignKey assignment and the related-object cache (see #6886).
|
|
|
|
p = Parent.objects.create(name="Parent")
|
|
c = Child.objects.create(name="Child", parent=p)
|
|
|
|
# Look up the object again so that we get a "fresh" object.
|
|
c = Child.objects.get(name="Child")
|
|
p = c.parent
|
|
|
|
# Accessing the related object again returns the exactly same object.
|
|
self.assertIs(c.parent, p)
|
|
|
|
# But if we kill the cache, we get a new object.
|
|
del c._parent_cache
|
|
self.assertIsNot(c.parent, p)
|
|
|
|
# Assigning a new object results in that object getting cached immediately.
|
|
p2 = Parent.objects.create(name="Parent 2")
|
|
c.parent = p2
|
|
self.assertIs(c.parent, p2)
|
|
|
|
# Assigning None succeeds if field is null=True.
|
|
p.bestchild = None
|
|
self.assertIsNone(p.bestchild)
|
|
|
|
# bestchild should still be None after saving.
|
|
p.save()
|
|
self.assertIsNone(p.bestchild)
|
|
|
|
# bestchild should still be None after fetching the object again.
|
|
p = Parent.objects.get(name="Parent")
|
|
self.assertIsNone(p.bestchild)
|
|
|
|
# Assigning None will not fail: Child.parent is null=False.
|
|
setattr(c, "parent", None)
|
|
|
|
# You also can't assign an object of the wrong type here
|
|
with self.assertRaises(ValueError):
|
|
setattr(c, "parent", First(id=1, second=1))
|
|
|
|
# You can assign None to Child.parent during object creation.
|
|
Child(name='xyzzy', parent=None)
|
|
|
|
# But when trying to save a Child with parent=None, the database will
|
|
# raise IntegrityError.
|
|
with self.assertRaises(IntegrityError), transaction.atomic():
|
|
Child.objects.create(name='xyzzy', parent=None)
|
|
|
|
# Creation using keyword argument should cache the related object.
|
|
p = Parent.objects.get(name="Parent")
|
|
c = Child(parent=p)
|
|
self.assertIs(c.parent, p)
|
|
|
|
# Creation using keyword argument and unsaved related instance (#8070).
|
|
p = Parent()
|
|
msg = "save() prohibited to prevent data loss due to unsaved related object 'parent'."
|
|
with self.assertRaisesMessage(ValueError, msg):
|
|
Child.objects.create(parent=p)
|
|
|
|
msg = "save() prohibited to prevent data loss due to unsaved related object 'parent'."
|
|
with self.assertRaisesMessage(ValueError, msg):
|
|
ToFieldChild.objects.create(parent=p)
|
|
|
|
# Creation using attname keyword argument and an id will cause the
|
|
# related object to be fetched.
|
|
p = Parent.objects.get(name="Parent")
|
|
c = Child(parent_id=p.id)
|
|
self.assertIsNot(c.parent, p)
|
|
self.assertEqual(c.parent, p)
|
|
|
|
def test_fk_to_bigautofield(self):
|
|
ch = City.objects.create(name='Chicago')
|
|
District.objects.create(city=ch, name='Far South')
|
|
District.objects.create(city=ch, name='North')
|
|
|
|
ny = City.objects.create(name='New York', id=2 ** 33)
|
|
District.objects.create(city=ny, name='Brooklyn')
|
|
District.objects.create(city=ny, name='Manhattan')
|
|
|
|
def test_multiple_foreignkeys(self):
|
|
# Test of multiple ForeignKeys to the same model (bug #7125).
|
|
c1 = Category.objects.create(name='First')
|
|
c2 = Category.objects.create(name='Second')
|
|
c3 = Category.objects.create(name='Third')
|
|
r1 = Record.objects.create(category=c1)
|
|
r2 = Record.objects.create(category=c1)
|
|
r3 = Record.objects.create(category=c2)
|
|
r4 = Record.objects.create(category=c2)
|
|
r5 = Record.objects.create(category=c3)
|
|
Relation.objects.create(left=r1, right=r2)
|
|
Relation.objects.create(left=r3, right=r4)
|
|
Relation.objects.create(left=r1, right=r3)
|
|
Relation.objects.create(left=r5, right=r2)
|
|
Relation.objects.create(left=r3, right=r2)
|
|
|
|
q1 = Relation.objects.filter(left__category__name__in=['First'], right__category__name__in=['Second'])
|
|
self.assertQuerysetEqual(q1, ["<Relation: First - Second>"])
|
|
|
|
q2 = Category.objects.filter(record__left_set__right__category__name='Second').order_by('name')
|
|
self.assertQuerysetEqual(q2, ["<Category: First>", "<Category: Second>"])
|
|
|
|
p = Parent.objects.create(name="Parent")
|
|
c = Child.objects.create(name="Child", parent=p)
|
|
with self.assertRaises(ValueError):
|
|
Child.objects.create(name="Grandchild", parent=c)
|
|
|
|
def test_fk_instantiation_outside_model(self):
|
|
# Regression for #12190 -- Should be able to instantiate a FK outside
|
|
# of a model, and interrogate its related field.
|
|
cat = models.ForeignKey(Category, models.CASCADE)
|
|
self.assertEqual('id', cat.remote_field.get_related_field().name)
|
|
|
|
def test_relation_unsaved(self):
|
|
# The <field>_set manager does not join on Null value fields (#17541)
|
|
Third.objects.create(name='Third 1')
|
|
Third.objects.create(name='Third 2')
|
|
th = Third(name="testing")
|
|
# The object isn't saved an thus the relation field is null - we won't even
|
|
# execute a query in this case.
|
|
with self.assertNumQueries(0):
|
|
self.assertEqual(th.child_set.count(), 0)
|
|
th.save()
|
|
# Now the model is saved, so we will need to execute an query.
|
|
with self.assertNumQueries(1):
|
|
self.assertEqual(th.child_set.count(), 0)
|
|
|
|
def test_related_object(self):
|
|
public_school = School.objects.create(is_public=True)
|
|
public_student = Student.objects.create(school=public_school)
|
|
|
|
private_school = School.objects.create(is_public=False)
|
|
private_student = Student.objects.create(school=private_school)
|
|
|
|
# Only one school is available via all() due to the custom default manager.
|
|
self.assertSequenceEqual(School.objects.all(), [public_school])
|
|
|
|
self.assertEqual(public_student.school, public_school)
|
|
|
|
# Make sure the base manager is used so that an student can still access
|
|
# its related school even if the default manager doesn't normally
|
|
# allow it.
|
|
self.assertEqual(private_student.school, private_school)
|
|
|
|
School._meta.base_manager_name = 'objects'
|
|
School._meta._expire_cache()
|
|
try:
|
|
private_student = Student.objects.get(pk=private_student.pk)
|
|
with self.assertRaises(School.DoesNotExist):
|
|
private_student.school
|
|
finally:
|
|
School._meta.base_manager_name = None
|
|
School._meta._expire_cache()
|
|
|
|
def test_hasattr_related_object(self):
|
|
# The exception raised on attribute access when a related object
|
|
# doesn't exist should be an instance of a subclass of `AttributeError`
|
|
# refs #21563
|
|
self.assertFalse(hasattr(Article(), 'reporter'))
|
|
|
|
def test_clear_after_prefetch(self):
|
|
c = City.objects.create(name='Musical City')
|
|
District.objects.create(name='Ladida', city=c)
|
|
city = City.objects.prefetch_related('districts').get(id=c.id)
|
|
self.assertQuerysetEqual(city.districts.all(), ['<District: Ladida>'])
|
|
city.districts.clear()
|
|
self.assertQuerysetEqual(city.districts.all(), [])
|
|
|
|
def test_remove_after_prefetch(self):
|
|
c = City.objects.create(name='Musical City')
|
|
d = District.objects.create(name='Ladida', city=c)
|
|
city = City.objects.prefetch_related('districts').get(id=c.id)
|
|
self.assertQuerysetEqual(city.districts.all(), ['<District: Ladida>'])
|
|
city.districts.remove(d)
|
|
self.assertQuerysetEqual(city.districts.all(), [])
|
|
|
|
def test_add_after_prefetch(self):
|
|
c = City.objects.create(name='Musical City')
|
|
District.objects.create(name='Ladida', city=c)
|
|
d2 = District.objects.create(name='Ladidu')
|
|
city = City.objects.prefetch_related('districts').get(id=c.id)
|
|
self.assertEqual(city.districts.count(), 1)
|
|
city.districts.add(d2)
|
|
self.assertEqual(city.districts.count(), 2)
|
|
|
|
def test_set_after_prefetch(self):
|
|
c = City.objects.create(name='Musical City')
|
|
District.objects.create(name='Ladida', city=c)
|
|
d2 = District.objects.create(name='Ladidu')
|
|
city = City.objects.prefetch_related('districts').get(id=c.id)
|
|
self.assertEqual(city.districts.count(), 1)
|
|
city.districts.set([d2])
|
|
self.assertQuerysetEqual(city.districts.all(), ['<District: Ladidu>'])
|
|
|
|
def test_add_then_remove_after_prefetch(self):
|
|
c = City.objects.create(name='Musical City')
|
|
District.objects.create(name='Ladida', city=c)
|
|
d2 = District.objects.create(name='Ladidu')
|
|
city = City.objects.prefetch_related('districts').get(id=c.id)
|
|
self.assertEqual(city.districts.count(), 1)
|
|
city.districts.add(d2)
|
|
self.assertEqual(city.districts.count(), 2)
|
|
city.districts.remove(d2)
|
|
self.assertEqual(city.districts.count(), 1)
|