390 lines
18 KiB
Python
390 lines
18 KiB
Python
from __future__ import absolute_import
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from django.test import TestCase
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from .models import Article, Publication
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class ManyToManyTests(TestCase):
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def setUp(self):
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# Create a couple of Publications.
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self.p1 = Publication.objects.create(id=None, title='The Python Journal')
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self.p2 = Publication.objects.create(id=None, title='Science News')
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self.p3 = Publication.objects.create(id=None, title='Science Weekly')
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self.p4 = Publication.objects.create(title='Highlights for Children')
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self.a1 = Article.objects.create(id=None, headline='Django lets you build Web apps easily')
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self.a1.publications.add(self.p1)
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self.a2 = Article.objects.create(id=None, headline='NASA uses Python')
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self.a2.publications.add(self.p1, self.p2, self.p3, self.p4)
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self.a3 = Article.objects.create(headline='NASA finds intelligent life on Earth')
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self.a3.publications.add(self.p2)
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self.a4 = Article.objects.create(headline='Oxygen-free diet works wonders')
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self.a4.publications.add(self.p2)
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def test_add(self):
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# Create an Article.
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a5 = Article(id=None, headline='Django lets you reate Web apps easily')
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# You can't associate it with a Publication until it's been saved.
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self.assertRaises(ValueError, getattr, a5, 'publications')
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# Save it!
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a5.save()
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# Associate the Article with a Publication.
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a5.publications.add(self.p1)
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self.assertQuerysetEqual(a5.publications.all(),
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['<Publication: The Python Journal>'])
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# Create another Article, and set it to appear in both Publications.
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a6 = Article(id=None, headline='ESA uses Python')
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a6.save()
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a6.publications.add(self.p1, self.p2)
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a6.publications.add(self.p3)
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# Adding a second time is OK
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a6.publications.add(self.p3)
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self.assertQuerysetEqual(a6.publications.all(),
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[
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'<Publication: Science News>',
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'<Publication: Science Weekly>',
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'<Publication: The Python Journal>',
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])
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# Adding an object of the wrong type raises TypeError
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with self.assertRaisesRegexp(TypeError, "'Publication' instance expected, got <Article.*"):
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a6.publications.add(a5)
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# Add a Publication directly via publications.add by using keyword arguments.
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p4 = a6.publications.create(title='Highlights for Adults')
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self.assertQuerysetEqual(a6.publications.all(),
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[
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'<Publication: Highlights for Adults>',
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'<Publication: Science News>',
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'<Publication: Science Weekly>',
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'<Publication: The Python Journal>',
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])
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def test_reverse_add(self):
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# Adding via the 'other' end of an m2m
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a5 = Article(headline='NASA finds intelligent life on Mars')
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a5.save()
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self.p2.article_set.add(a5)
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self.assertQuerysetEqual(self.p2.article_set.all(),
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[
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: NASA finds intelligent life on Mars>',
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'<Article: NASA uses Python>',
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'<Article: Oxygen-free diet works wonders>',
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])
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self.assertQuerysetEqual(a5.publications.all(),
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['<Publication: Science News>'])
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# Adding via the other end using keywords
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new_article = self.p2.article_set.create(headline='Carbon-free diet works wonders')
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self.assertQuerysetEqual(
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self.p2.article_set.all(),
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[
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'<Article: Carbon-free diet works wonders>',
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: NASA finds intelligent life on Mars>',
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'<Article: NASA uses Python>',
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'<Article: Oxygen-free diet works wonders>',
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])
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a6 = self.p2.article_set.all()[3]
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self.assertQuerysetEqual(a6.publications.all(),
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[
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'<Publication: Highlights for Children>',
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'<Publication: Science News>',
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'<Publication: Science Weekly>',
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'<Publication: The Python Journal>',
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])
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def test_related_sets(self):
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# Article objects have access to their related Publication objects.
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self.assertQuerysetEqual(self.a1.publications.all(),
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['<Publication: The Python Journal>'])
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self.assertQuerysetEqual(self.a2.publications.all(),
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[
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'<Publication: Highlights for Children>',
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'<Publication: Science News>',
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'<Publication: Science Weekly>',
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'<Publication: The Python Journal>',
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])
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# Publication objects have access to their related Article objects.
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self.assertQuerysetEqual(self.p2.article_set.all(),
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[
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: NASA uses Python>',
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'<Article: Oxygen-free diet works wonders>',
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])
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self.assertQuerysetEqual(self.p1.article_set.all(),
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[
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'<Article: Django lets you build Web apps easily>',
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'<Article: NASA uses Python>',
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])
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self.assertQuerysetEqual(Publication.objects.get(id=self.p4.id).article_set.all(),
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['<Article: NASA uses Python>'])
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def test_selects(self):
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# We can perform kwarg queries across m2m relationships
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self.assertQuerysetEqual(
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Article.objects.filter(publications__id__exact=self.p1.id),
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[
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'<Article: Django lets you build Web apps easily>',
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'<Article: NASA uses Python>',
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])
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self.assertQuerysetEqual(
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Article.objects.filter(publications__pk=self.p1.id),
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[
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'<Article: Django lets you build Web apps easily>',
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'<Article: NASA uses Python>',
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])
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self.assertQuerysetEqual(
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Article.objects.filter(publications=self.p1.id),
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[
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'<Article: Django lets you build Web apps easily>',
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'<Article: NASA uses Python>',
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])
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self.assertQuerysetEqual(
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Article.objects.filter(publications=self.p1),
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[
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'<Article: Django lets you build Web apps easily>',
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'<Article: NASA uses Python>',
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])
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self.assertQuerysetEqual(
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Article.objects.filter(publications__title__startswith="Science"),
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[
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: NASA uses Python>',
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'<Article: NASA uses Python>',
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'<Article: Oxygen-free diet works wonders>',
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])
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self.assertQuerysetEqual(
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Article.objects.filter(publications__title__startswith="Science").distinct(),
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[
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: NASA uses Python>',
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'<Article: Oxygen-free diet works wonders>',
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])
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# The count() function respects distinct() as well.
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self.assertEqual(Article.objects.filter(publications__title__startswith="Science").count(), 4)
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self.assertEqual(Article.objects.filter(publications__title__startswith="Science").distinct().count(), 3)
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self.assertQuerysetEqual(
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Article.objects.filter(publications__in=[self.p1.id,self.p2.id]).distinct(),
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[
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'<Article: Django lets you build Web apps easily>',
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: NASA uses Python>',
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'<Article: Oxygen-free diet works wonders>',
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])
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self.assertQuerysetEqual(
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Article.objects.filter(publications__in=[self.p1.id,self.p2]).distinct(),
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[
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'<Article: Django lets you build Web apps easily>',
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: NASA uses Python>',
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'<Article: Oxygen-free diet works wonders>',
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])
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self.assertQuerysetEqual(
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Article.objects.filter(publications__in=[self.p1,self.p2]).distinct(),
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[
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'<Article: Django lets you build Web apps easily>',
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: NASA uses Python>',
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'<Article: Oxygen-free diet works wonders>',
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])
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# Excluding a related item works as you would expect, too (although the SQL
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# involved is a little complex).
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self.assertQuerysetEqual(Article.objects.exclude(publications=self.p2),
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['<Article: Django lets you build Web apps easily>'])
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def test_reverse_selects(self):
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# Reverse m2m queries are supported (i.e., starting at the table that
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# doesn't have a ManyToManyField).
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self.assertQuerysetEqual(Publication.objects.filter(id__exact=self.p1.id),
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['<Publication: The Python Journal>'])
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self.assertQuerysetEqual(Publication.objects.filter(pk=self.p1.id),
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['<Publication: The Python Journal>'])
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self.assertQuerysetEqual(
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Publication.objects.filter(article__headline__startswith="NASA"),
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[
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'<Publication: Highlights for Children>',
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'<Publication: Science News>',
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'<Publication: Science News>',
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'<Publication: Science Weekly>',
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'<Publication: The Python Journal>',
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])
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self.assertQuerysetEqual(Publication.objects.filter(article__id__exact=self.a1.id),
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['<Publication: The Python Journal>'])
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self.assertQuerysetEqual(Publication.objects.filter(article__pk=self.a1.id),
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['<Publication: The Python Journal>'])
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self.assertQuerysetEqual(Publication.objects.filter(article=self.a1.id),
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['<Publication: The Python Journal>'])
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self.assertQuerysetEqual(Publication.objects.filter(article=self.a1),
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['<Publication: The Python Journal>'])
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self.assertQuerysetEqual(
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Publication.objects.filter(article__in=[self.a1.id,self.a2.id]).distinct(),
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[
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'<Publication: Highlights for Children>',
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'<Publication: Science News>',
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'<Publication: Science Weekly>',
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'<Publication: The Python Journal>',
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])
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self.assertQuerysetEqual(
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Publication.objects.filter(article__in=[self.a1.id,self.a2]).distinct(),
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[
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'<Publication: Highlights for Children>',
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'<Publication: Science News>',
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'<Publication: Science Weekly>',
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'<Publication: The Python Journal>',
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])
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self.assertQuerysetEqual(
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Publication.objects.filter(article__in=[self.a1,self.a2]).distinct(),
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[
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'<Publication: Highlights for Children>',
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'<Publication: Science News>',
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'<Publication: Science Weekly>',
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'<Publication: The Python Journal>',
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])
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def test_delete(self):
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# If we delete a Publication, its Articles won't be able to access it.
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self.p1.delete()
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self.assertQuerysetEqual(Publication.objects.all(),
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[
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'<Publication: Highlights for Children>',
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'<Publication: Science News>',
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'<Publication: Science Weekly>',
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])
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self.assertQuerysetEqual(self.a1.publications.all(), [])
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# If we delete an Article, its Publications won't be able to access it.
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self.a2.delete()
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self.assertQuerysetEqual(Article.objects.all(),
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[
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'<Article: Django lets you build Web apps easily>',
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: Oxygen-free diet works wonders>',
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])
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self.assertQuerysetEqual(self.p2.article_set.all(),
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[
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: Oxygen-free diet works wonders>',
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])
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def test_bulk_delete(self):
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# Bulk delete some Publications - references to deleted publications should go
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Publication.objects.filter(title__startswith='Science').delete()
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self.assertQuerysetEqual(Publication.objects.all(),
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[
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'<Publication: Highlights for Children>',
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'<Publication: The Python Journal>',
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])
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self.assertQuerysetEqual(Article.objects.all(),
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[
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'<Article: Django lets you build Web apps easily>',
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: NASA uses Python>',
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'<Article: Oxygen-free diet works wonders>',
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])
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self.assertQuerysetEqual(self.a2.publications.all(),
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[
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'<Publication: Highlights for Children>',
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'<Publication: The Python Journal>',
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])
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# Bulk delete some articles - references to deleted objects should go
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q = Article.objects.filter(headline__startswith='Django')
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self.assertQuerysetEqual(q, ['<Article: Django lets you build Web apps easily>'])
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q.delete()
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# After the delete, the QuerySet cache needs to be cleared,
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# and the referenced objects should be gone
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self.assertQuerysetEqual(q, [])
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self.assertQuerysetEqual(self.p1.article_set.all(),
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['<Article: NASA uses Python>'])
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def test_remove(self):
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# Removing publication from an article:
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self.assertQuerysetEqual(self.p2.article_set.all(),
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[
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: NASA uses Python>',
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'<Article: Oxygen-free diet works wonders>',
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])
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self.a4.publications.remove(self.p2)
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self.assertQuerysetEqual(self.p2.article_set.all(),
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[
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: NASA uses Python>',
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])
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self.assertQuerysetEqual(self.a4.publications.all(), [])
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# And from the other end
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self.p2.article_set.remove(self.a3)
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self.assertQuerysetEqual(self.p2.article_set.all(),
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[
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'<Article: NASA uses Python>',
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])
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self.assertQuerysetEqual(self.a3.publications.all(), [])
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def test_assign(self):
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# Relation sets can be assigned. Assignment clears any existing set members
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self.p2.article_set = [self.a4, self.a3]
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self.assertQuerysetEqual(self.p2.article_set.all(),
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[
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: Oxygen-free diet works wonders>',
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])
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self.assertQuerysetEqual(self.a4.publications.all(),
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['<Publication: Science News>'])
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self.a4.publications = [self.p3.id]
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self.assertQuerysetEqual(self.p2.article_set.all(),
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['<Article: NASA finds intelligent life on Earth>'])
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self.assertQuerysetEqual(self.a4.publications.all(),
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['<Publication: Science Weekly>'])
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# An alternate to calling clear() is to assign the empty set
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self.p2.article_set = []
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self.assertQuerysetEqual(self.p2.article_set.all(), [])
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self.a4.publications = []
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self.assertQuerysetEqual(self.a4.publications.all(), [])
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def test_assign_ids(self):
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# Relation sets can also be set using primary key values
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self.p2.article_set = [self.a4.id, self.a3.id]
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self.assertQuerysetEqual(self.p2.article_set.all(),
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[
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: Oxygen-free diet works wonders>',
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])
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self.assertQuerysetEqual(self.a4.publications.all(),
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['<Publication: Science News>'])
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self.a4.publications = [self.p3.id]
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self.assertQuerysetEqual(self.p2.article_set.all(),
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['<Article: NASA finds intelligent life on Earth>'])
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self.assertQuerysetEqual(self.a4.publications.all(),
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['<Publication: Science Weekly>'])
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def test_clear(self):
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# Relation sets can be cleared:
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self.p2.article_set.clear()
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self.assertQuerysetEqual(self.p2.article_set.all(), [])
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self.assertQuerysetEqual(self.a4.publications.all(), [])
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# And you can clear from the other end
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self.p2.article_set.add(self.a3, self.a4)
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self.assertQuerysetEqual(self.p2.article_set.all(),
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[
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'<Article: NASA finds intelligent life on Earth>',
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'<Article: Oxygen-free diet works wonders>',
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])
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self.assertQuerysetEqual(self.a4.publications.all(),
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[
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'<Publication: Science News>',
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])
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self.a4.publications.clear()
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self.assertQuerysetEqual(self.a4.publications.all(), [])
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self.assertQuerysetEqual(self.p2.article_set.all(),
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['<Article: NASA finds intelligent life on Earth>'])
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