415 lines
20 KiB
Python
415 lines
20 KiB
Python
from __future__ import absolute_import, with_statement
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from copy import deepcopy
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from datetime import datetime
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from django.core.exceptions import MultipleObjectsReturned
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from django.test import TestCase
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from .models import Article, Reporter
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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(id=None, headline="This is a test",
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pub_date=datetime(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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# These are strings instead of unicode strings because that's what was used in
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# the creation of this reporter (and we haven't refreshed the data from the
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# database, which always returns unicode strings).
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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(id=None, headline="Third article",
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pub_date=datetime(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(id=None, headline="Fourth article",
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pub_date=datetime(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",
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pub_date=datetime(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(2006, 1, 17))
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self.r.article_set.add(new_article2)
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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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[
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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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# 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 self.assertRaisesRegexp(TypeError, "'Article' instance expected, got <Reporter.*"):
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self.r.article_set.add(self.r2)
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self.assertQuerysetEqual(self.r.article_set.all(),
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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_assign(self):
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new_article = self.r.article_set.create(headline="John's second story",
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pub_date=datetime(2005, 7, 29))
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new_article2 = self.r2.article_set.create(headline="Paul's story",
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pub_date=datetime(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 descriptor.
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self.r2.article_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(self.r2.article_set.all(),
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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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])
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# Funny case - assignment notation can only go so far; because the
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# ForeignKey cannot be null, existing members of the set must remain.
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self.r.article_set = [new_article]
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self.assertQuerysetEqual(self.r.article_set.all(),
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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(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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new_article = self.r.article_set.create(headline="John's second story",
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pub_date=datetime(2005, 7, 29))
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new_article2 = self.r2.article_set.create(headline="Paul's story",
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pub_date=datetime(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'),
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["<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),
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["<Article: This is a test>"])
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self.assertQuerysetEqual(Article.objects.filter(pk=self.a.id),
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["<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'),
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["<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(Article.objects.filter(reporter__first_name__exact='John'),
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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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# Check that implied __exact also works
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self.assertQuerysetEqual(Article.objects.filter(reporter__first_name='John'),
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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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# Query twice over the related field.
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self.assertQuerysetEqual(
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Article.objects.filter(reporter__first_name__exact='John',
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reporter__last_name__exact='Smith'),
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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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# 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',
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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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[
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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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# ... and should work fine with the unicode that comes out of forms.Form.cleaned_data
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self.assertQuerysetEqual(
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Article.objects.filter(reporter__first_name__exact='John'
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).extra(where=["many_to_one_reporter.last_name='%s'" % u'Smith']),
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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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# 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(id=None, headline="Third article",
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pub_date=datetime(2005, 7, 27), reporter_id=self.r.id)
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a4 = Article.objects.create(id=None, headline="Fourth article",
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pub_date=datetime(2005, 7, 27), reporter_id=str(self.r.id))
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# Reporters can be queried
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self.assertQuerysetEqual(Reporter.objects.filter(id__exact=self.r.id),
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["<Reporter: John Smith>"])
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self.assertQuerysetEqual(Reporter.objects.filter(pk=self.r.id),
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["<Reporter: John Smith>"])
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self.assertQuerysetEqual(Reporter.objects.filter(first_name__startswith='John'),
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["<Reporter: 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),
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["<Reporter: John Smith>"])
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self.assertQuerysetEqual(Reporter.objects.filter(article__pk=self.a.id),
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["<Reporter: John Smith>"])
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self.assertQuerysetEqual(Reporter.objects.filter(article=self.a.id),
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["<Reporter: John Smith>"])
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self.assertQuerysetEqual(Reporter.objects.filter(article=self.a),
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["<Reporter: John Smith>"])
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self.assertQuerysetEqual(
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Reporter.objects.filter(article__in=[self.a.id,a3.id]).distinct(),
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["<Reporter: John Smith>"])
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self.assertQuerysetEqual(
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Reporter.objects.filter(article__in=[self.a.id,a3]).distinct(),
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["<Reporter: John Smith>"])
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self.assertQuerysetEqual(
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Reporter.objects.filter(article__in=[self.a,a3]).distinct(),
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["<Reporter: 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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self.assertQuerysetEqual(
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Reporter.objects.filter(article__headline__startswith='T').distinct(),
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["<Reporter: John Smith>"])
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# Counting in the opposite direction works in conjunction with distinct()
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self.assertEqual(
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Reporter.objects.filter(article__headline__startswith='T').count(), 2)
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self.assertEqual(
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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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self.assertQuerysetEqual(
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Reporter.objects.filter(article__reporter__first_name__startswith='John').distinct(),
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["<Reporter: John Smith>"])
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self.assertQuerysetEqual(
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Reporter.objects.filter(article__reporter__exact=self.r).distinct(),
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["<Reporter: John Smith>"])
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# Check that implied __exact also works.
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self.assertQuerysetEqual(
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Reporter.objects.filter(article__reporter=self.r).distinct(),
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["<Reporter: 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': u'John', 'reporter__last_name': u'Smith'}
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self.assertEqual([d],
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list(Article.objects.filter(reporter=self.r).distinct().order_by()
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.values('reporter__first_name', 'reporter__last_name')))
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def test_select_related(self):
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# Check that Article.objects.select_related().dates() works properly when
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# there 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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a1 = Article.objects.create(headline='First', pub_date=datetime(1980, 4, 23), reporter=r1)
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a2 = Article.objects.create(headline='Second', pub_date=datetime(1980, 4, 23), reporter=r2)
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self.assertEqual(list(Article.objects.select_related().dates('pub_date', 'day')),
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[
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datetime(1980, 4, 23, 0, 0),
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datetime(2005, 7, 27, 0, 0),
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])
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self.assertEqual(list(Article.objects.select_related().dates('pub_date', 'month')),
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[
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datetime(1980, 4, 1, 0, 0),
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datetime(2005, 7, 1, 0, 0),
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])
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self.assertEqual(list(Article.objects.select_related().dates('pub_date', 'year')),
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[
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datetime(1980, 1, 1, 0, 0),
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datetime(2005, 1, 1, 0, 0),
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])
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def test_delete(self):
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new_article = self.r.article_set.create(headline="John's second story",
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pub_date=datetime(2005, 7, 29))
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new_article2 = self.r2.article_set.create(headline="Paul's story",
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pub_date=datetime(2006, 1, 17))
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a3 = Article.objects.create(id=None, headline="Third article",
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pub_date=datetime(2005, 7, 27), reporter_id=self.r.id)
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a4 = Article.objects.create(id=None, headline="Fourth article",
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pub_date=datetime(2005, 7, 27), reporter_id=str(self.r.id))
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# If you delete a reporter, his articles will be deleted.
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self.assertQuerysetEqual(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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self.assertQuerysetEqual(Reporter.objects.order_by('first_name'),
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[
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"<Reporter: John Smith>",
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"<Reporter: Paul Jones>",
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])
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self.r2.delete()
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self.assertQuerysetEqual(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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self.assertQuerysetEqual(Reporter.objects.order_by('first_name'),
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["<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_regression_12876(self):
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# Regression for #12876 -- Model methods that include queries that
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# recursive don't cause recursion depth problems under deepcopy.
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self.r.cached_query = Article.objects.filter(reporter=self.r)
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self.assertEqual(repr(deepcopy(self.r)), "<Reporter: John Smith>")
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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(id=None,
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headline="John's second test",
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pub_date=datetime(2011, 5, 7),
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reporter_id=self.r.id)
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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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[
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"<Article: John's second test>",
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"<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(id=None, headline="Paul's commentary",
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pub_date=datetime(2011, 5, 7),
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reporter_id=self.r2.id)
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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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self.assertRaises(MultipleObjectsReturned,
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Article.objects.get, reporter_id=self.r.id)
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self.assertEqual(repr(a3),
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repr(Article.objects.get(reporter_id=self.r2.id,
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pub_date=datetime(2011, 5, 7))))
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def test_manager_class_caching(self):
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r1 = Reporter.objects.create(first_name='Mike')
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r2 = Reporter.objects.create(first_name='John')
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# Same twice
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self.assertTrue(r1.article_set.__class__ is r1.article_set.__class__)
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# Same as each other
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self.assertTrue(r1.article_set.__class__ is r2.article_set.__class__)
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