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