414 lines
20 KiB
Python
414 lines
20 KiB
Python
from __future__ import absolute_import
|
|
|
|
from copy import deepcopy
|
|
from datetime import datetime
|
|
|
|
from django.core.exceptions import MultipleObjectsReturned
|
|
from django.test import TestCase
|
|
|
|
from .models import Article, Reporter
|
|
|
|
|
|
class ManyToOneTests(TestCase):
|
|
def setUp(self):
|
|
# Create a few Reporters.
|
|
self.r = Reporter(first_name='John', last_name='Smith', email='john@example.com')
|
|
self.r.save()
|
|
self.r2 = Reporter(first_name='Paul', last_name='Jones', email='paul@example.com')
|
|
self.r2.save()
|
|
# Create an Article.
|
|
self.a = Article(id=None, headline="This is a test",
|
|
pub_date=datetime(2005, 7, 27), reporter=self.r)
|
|
self.a.save()
|
|
|
|
def test_get(self):
|
|
# Article objects have access to their related Reporter objects.
|
|
r = self.a.reporter
|
|
self.assertEqual(r.id, self.r.id)
|
|
# These are strings instead of unicode strings because that's what was used in
|
|
# the creation of this reporter (and we haven't refreshed the data from the
|
|
# database, which always returns unicode strings).
|
|
self.assertEqual((r.first_name, self.r.last_name), ('John', 'Smith'))
|
|
|
|
def test_create(self):
|
|
# You can also instantiate an Article by passing the Reporter's ID
|
|
# instead of a Reporter object.
|
|
a3 = Article(id=None, headline="Third article",
|
|
pub_date=datetime(2005, 7, 27), reporter_id=self.r.id)
|
|
a3.save()
|
|
self.assertEqual(a3.reporter.id, self.r.id)
|
|
|
|
# Similarly, the reporter ID can be a string.
|
|
a4 = Article(id=None, headline="Fourth article",
|
|
pub_date=datetime(2005, 7, 27), reporter_id=str(self.r.id))
|
|
a4.save()
|
|
self.assertEqual(repr(a4.reporter), "<Reporter: John Smith>")
|
|
|
|
def test_add(self):
|
|
# Create an Article via the Reporter object.
|
|
new_article = self.r.article_set.create(headline="John's second story",
|
|
pub_date=datetime(2005, 7, 29))
|
|
self.assertEqual(repr(new_article), "<Article: John's second story>")
|
|
self.assertEqual(new_article.reporter.id, self.r.id)
|
|
|
|
# Create a new article, and add it to the article set.
|
|
new_article2 = Article(headline="Paul's story", pub_date=datetime(2006, 1, 17))
|
|
self.r.article_set.add(new_article2)
|
|
self.assertEqual(new_article2.reporter.id, self.r.id)
|
|
self.assertQuerysetEqual(self.r.article_set.all(),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: Paul's story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
|
|
# Add the same article to a different article set - check that it moves.
|
|
self.r2.article_set.add(new_article2)
|
|
self.assertEqual(new_article2.reporter.id, self.r2.id)
|
|
self.assertQuerysetEqual(self.r2.article_set.all(), ["<Article: Paul's story>"])
|
|
|
|
# Adding an object of the wrong type raises TypeError.
|
|
self.assertRaises(TypeError, self.r.article_set.add, self.r2)
|
|
self.assertQuerysetEqual(self.r.article_set.all(),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
|
|
def test_assign(self):
|
|
new_article = self.r.article_set.create(headline="John's second story",
|
|
pub_date=datetime(2005, 7, 29))
|
|
new_article2 = self.r2.article_set.create(headline="Paul's story",
|
|
pub_date=datetime(2006, 1, 17))
|
|
# Assign the article to the reporter directly using the descriptor.
|
|
new_article2.reporter = self.r
|
|
new_article2.save()
|
|
self.assertEqual(repr(new_article2.reporter), "<Reporter: John Smith>")
|
|
self.assertEqual(new_article2.reporter.id, self.r.id)
|
|
self.assertQuerysetEqual(self.r.article_set.all(), [
|
|
"<Article: John's second story>",
|
|
"<Article: Paul's story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
self.assertQuerysetEqual(self.r2.article_set.all(), [])
|
|
# Set the article back again using set descriptor.
|
|
self.r2.article_set = [new_article, new_article2]
|
|
self.assertQuerysetEqual(self.r.article_set.all(), ["<Article: This is a test>"])
|
|
self.assertQuerysetEqual(self.r2.article_set.all(),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: Paul's story>",
|
|
])
|
|
|
|
# Funny case - assignment notation can only go so far; because the
|
|
# ForeignKey cannot be null, existing members of the set must remain.
|
|
self.r.article_set = [new_article]
|
|
self.assertQuerysetEqual(self.r.article_set.all(),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
self.assertQuerysetEqual(self.r2.article_set.all(), ["<Article: Paul's story>"])
|
|
# Reporter cannot be null - there should not be a clear or remove method
|
|
self.assertFalse(hasattr(self.r2.article_set, 'remove'))
|
|
self.assertFalse(hasattr(self.r2.article_set, 'clear'))
|
|
|
|
def test_selects(self):
|
|
new_article = self.r.article_set.create(headline="John's second story",
|
|
pub_date=datetime(2005, 7, 29))
|
|
new_article2 = self.r2.article_set.create(headline="Paul's story",
|
|
pub_date=datetime(2006, 1, 17))
|
|
# Reporter objects have access to their related Article objects.
|
|
self.assertQuerysetEqual(self.r.article_set.all(), [
|
|
"<Article: John's second story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
self.assertQuerysetEqual(self.r.article_set.filter(headline__startswith='This'),
|
|
["<Article: This is a test>"])
|
|
self.assertEqual(self.r.article_set.count(), 2)
|
|
self.assertEqual(self.r2.article_set.count(), 1)
|
|
# Get articles by id
|
|
self.assertQuerysetEqual(Article.objects.filter(id__exact=self.a.id),
|
|
["<Article: This is a test>"])
|
|
self.assertQuerysetEqual(Article.objects.filter(pk=self.a.id),
|
|
["<Article: This is a test>"])
|
|
# Query on an article property
|
|
self.assertQuerysetEqual(Article.objects.filter(headline__startswith='This'),
|
|
["<Article: This is a test>"])
|
|
# The API automatically follows relationships as far as you need.
|
|
# Use double underscores to separate relationships.
|
|
# This works as many levels deep as you want. There's no limit.
|
|
# Find all Articles for any Reporter whose first name is "John".
|
|
self.assertQuerysetEqual(Article.objects.filter(reporter__first_name__exact='John'),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
# Check that implied __exact also works
|
|
self.assertQuerysetEqual(Article.objects.filter(reporter__first_name='John'),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
# Query twice over the related field.
|
|
self.assertQuerysetEqual(
|
|
Article.objects.filter(reporter__first_name__exact='John',
|
|
reporter__last_name__exact='Smith'),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
# The underlying query only makes one join when a related table is referenced twice.
|
|
queryset = Article.objects.filter(reporter__first_name__exact='John',
|
|
reporter__last_name__exact='Smith')
|
|
self.assertNumQueries(1, list, queryset)
|
|
self.assertEqual(queryset.query.get_compiler(queryset.db).as_sql()[0].count('INNER JOIN'), 1)
|
|
|
|
# The automatically joined table has a predictable name.
|
|
self.assertQuerysetEqual(
|
|
Article.objects.filter(reporter__first_name__exact='John').extra(
|
|
where=["many_to_one_reporter.last_name='Smith'"]),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
# ... and should work fine with the unicode that comes out of forms.Form.cleaned_data
|
|
self.assertQuerysetEqual(
|
|
Article.objects.filter(reporter__first_name__exact='John'
|
|
).extra(where=["many_to_one_reporter.last_name='%s'" % u'Smith']),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
# Find all Articles for a Reporter.
|
|
# Use direct ID check, pk check, and object comparison
|
|
self.assertQuerysetEqual(
|
|
Article.objects.filter(reporter__id__exact=self.r.id),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
self.assertQuerysetEqual(
|
|
Article.objects.filter(reporter__pk=self.r.id),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
self.assertQuerysetEqual(
|
|
Article.objects.filter(reporter=self.r.id),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
self.assertQuerysetEqual(
|
|
Article.objects.filter(reporter=self.r),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
self.assertQuerysetEqual(
|
|
Article.objects.filter(reporter__in=[self.r.id,self.r2.id]).distinct(),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: Paul's story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
self.assertQuerysetEqual(
|
|
Article.objects.filter(reporter__in=[self.r,self.r2]).distinct(),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: Paul's story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
# You can also use a queryset instead of a literal list of instances.
|
|
# The queryset must be reduced to a list of values using values(),
|
|
# then converted into a query
|
|
self.assertQuerysetEqual(
|
|
Article.objects.filter(
|
|
reporter__in=Reporter.objects.filter(first_name='John').values('pk').query
|
|
).distinct(),
|
|
[
|
|
"<Article: John's second story>",
|
|
"<Article: This is a test>",
|
|
])
|
|
|
|
def test_reverse_selects(self):
|
|
a3 = Article.objects.create(id=None, headline="Third article",
|
|
pub_date=datetime(2005, 7, 27), reporter_id=self.r.id)
|
|
a4 = Article.objects.create(id=None, headline="Fourth article",
|
|
pub_date=datetime(2005, 7, 27), reporter_id=str(self.r.id))
|
|
# Reporters can be queried
|
|
self.assertQuerysetEqual(Reporter.objects.filter(id__exact=self.r.id),
|
|
["<Reporter: John Smith>"])
|
|
self.assertQuerysetEqual(Reporter.objects.filter(pk=self.r.id),
|
|
["<Reporter: John Smith>"])
|
|
self.assertQuerysetEqual(Reporter.objects.filter(first_name__startswith='John'),
|
|
["<Reporter: John Smith>"])
|
|
# Reporters can query in opposite direction of ForeignKey definition
|
|
self.assertQuerysetEqual(Reporter.objects.filter(article__id__exact=self.a.id),
|
|
["<Reporter: John Smith>"])
|
|
self.assertQuerysetEqual(Reporter.objects.filter(article__pk=self.a.id),
|
|
["<Reporter: John Smith>"])
|
|
self.assertQuerysetEqual(Reporter.objects.filter(article=self.a.id),
|
|
["<Reporter: John Smith>"])
|
|
self.assertQuerysetEqual(Reporter.objects.filter(article=self.a),
|
|
["<Reporter: John Smith>"])
|
|
self.assertQuerysetEqual(
|
|
Reporter.objects.filter(article__in=[self.a.id,a3.id]).distinct(),
|
|
["<Reporter: John Smith>"])
|
|
self.assertQuerysetEqual(
|
|
Reporter.objects.filter(article__in=[self.a.id,a3]).distinct(),
|
|
["<Reporter: John Smith>"])
|
|
self.assertQuerysetEqual(
|
|
Reporter.objects.filter(article__in=[self.a,a3]).distinct(),
|
|
["<Reporter: John Smith>"])
|
|
self.assertQuerysetEqual(
|
|
Reporter.objects.filter(article__headline__startswith='T'),
|
|
["<Reporter: John Smith>", "<Reporter: John Smith>"])
|
|
self.assertQuerysetEqual(
|
|
Reporter.objects.filter(article__headline__startswith='T').distinct(),
|
|
["<Reporter: John Smith>"])
|
|
|
|
# Counting in the opposite direction works in conjunction with distinct()
|
|
self.assertEqual(
|
|
Reporter.objects.filter(article__headline__startswith='T').count(), 2)
|
|
self.assertEqual(
|
|
Reporter.objects.filter(article__headline__startswith='T').distinct().count(), 1)
|
|
|
|
# Queries can go round in circles.
|
|
self.assertQuerysetEqual(
|
|
Reporter.objects.filter(article__reporter__first_name__startswith='John'),
|
|
[
|
|
"<Reporter: John Smith>",
|
|
"<Reporter: John Smith>",
|
|
"<Reporter: John Smith>",
|
|
])
|
|
self.assertQuerysetEqual(
|
|
Reporter.objects.filter(article__reporter__first_name__startswith='John').distinct(),
|
|
["<Reporter: John Smith>"])
|
|
self.assertQuerysetEqual(
|
|
Reporter.objects.filter(article__reporter__exact=self.r).distinct(),
|
|
["<Reporter: John Smith>"])
|
|
|
|
# Check that implied __exact also works.
|
|
self.assertQuerysetEqual(
|
|
Reporter.objects.filter(article__reporter=self.r).distinct(),
|
|
["<Reporter: John Smith>"])
|
|
|
|
# It's possible to use values() calls across many-to-one relations.
|
|
# (Note, too, that we clear the ordering here so as not to drag the
|
|
# 'headline' field into the columns being used to determine uniqueness)
|
|
d = {'reporter__first_name': u'John', 'reporter__last_name': u'Smith'}
|
|
self.assertEqual([d],
|
|
list(Article.objects.filter(reporter=self.r).distinct().order_by()
|
|
.values('reporter__first_name', 'reporter__last_name')))
|
|
|
|
def test_select_related(self):
|
|
# Check that Article.objects.select_related().dates() works properly when
|
|
# there are multiple Articles with the same date but different foreign-key
|
|
# objects (Reporters).
|
|
r1 = Reporter.objects.create(first_name='Mike', last_name='Royko', email='royko@suntimes.com')
|
|
r2 = Reporter.objects.create(first_name='John', last_name='Kass', email='jkass@tribune.com')
|
|
a1 = Article.objects.create(headline='First', pub_date=datetime(1980, 4, 23), reporter=r1)
|
|
a2 = Article.objects.create(headline='Second', pub_date=datetime(1980, 4, 23), reporter=r2)
|
|
self.assertEqual(list(Article.objects.select_related().dates('pub_date', 'day')),
|
|
[
|
|
datetime(1980, 4, 23, 0, 0),
|
|
datetime(2005, 7, 27, 0, 0),
|
|
])
|
|
self.assertEqual(list(Article.objects.select_related().dates('pub_date', 'month')),
|
|
[
|
|
datetime(1980, 4, 1, 0, 0),
|
|
datetime(2005, 7, 1, 0, 0),
|
|
])
|
|
self.assertEqual(list(Article.objects.select_related().dates('pub_date', 'year')),
|
|
[
|
|
datetime(1980, 1, 1, 0, 0),
|
|
datetime(2005, 1, 1, 0, 0),
|
|
])
|
|
|
|
def test_delete(self):
|
|
new_article = self.r.article_set.create(headline="John's second story",
|
|
pub_date=datetime(2005, 7, 29))
|
|
new_article2 = self.r2.article_set.create(headline="Paul's story",
|
|
pub_date=datetime(2006, 1, 17))
|
|
a3 = Article.objects.create(id=None, headline="Third article",
|
|
pub_date=datetime(2005, 7, 27), reporter_id=self.r.id)
|
|
a4 = Article.objects.create(id=None, headline="Fourth article",
|
|
pub_date=datetime(2005, 7, 27), reporter_id=str(self.r.id))
|
|
# If you delete a reporter, his articles will be deleted.
|
|
self.assertQuerysetEqual(Article.objects.all(),
|
|
[
|
|
"<Article: Fourth article>",
|
|
"<Article: John's second story>",
|
|
"<Article: Paul's story>",
|
|
"<Article: Third article>",
|
|
"<Article: This is a test>",
|
|
])
|
|
self.assertQuerysetEqual(Reporter.objects.order_by('first_name'),
|
|
[
|
|
"<Reporter: John Smith>",
|
|
"<Reporter: Paul Jones>",
|
|
])
|
|
self.r2.delete()
|
|
self.assertQuerysetEqual(Article.objects.all(),
|
|
[
|
|
"<Article: Fourth article>",
|
|
"<Article: John's second story>",
|
|
"<Article: Third article>",
|
|
"<Article: This is a test>",
|
|
])
|
|
self.assertQuerysetEqual(Reporter.objects.order_by('first_name'),
|
|
["<Reporter: John Smith>"])
|
|
# You can delete using a JOIN in the query.
|
|
Reporter.objects.filter(article__headline__startswith='This').delete()
|
|
self.assertQuerysetEqual(Reporter.objects.all(), [])
|
|
self.assertQuerysetEqual(Article.objects.all(), [])
|
|
|
|
def test_regression_12876(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_explicit_fk(self):
|
|
# Create a new Article with get_or_create using an explicit value
|
|
# for a ForeignKey.
|
|
a2, created = Article.objects.get_or_create(id=None,
|
|
headline="John's second test",
|
|
pub_date=datetime(2011, 5, 7),
|
|
reporter_id=self.r.id)
|
|
self.assertTrue(created)
|
|
self.assertEqual(a2.reporter.id, self.r.id)
|
|
|
|
# You can specify filters containing the explicit FK value.
|
|
self.assertQuerysetEqual(
|
|
Article.objects.filter(reporter_id__exact=self.r.id),
|
|
[
|
|
"<Article: John's second test>",
|
|
"<Article: This is a test>",
|
|
])
|
|
|
|
# Create an Article by Paul for the same date.
|
|
a3 = Article.objects.create(id=None, headline="Paul's commentary",
|
|
pub_date=datetime(2011, 5, 7),
|
|
reporter_id=self.r2.id)
|
|
self.assertEqual(a3.reporter.id, self.r2.id)
|
|
|
|
# Get should respect explicit foreign keys as well.
|
|
self.assertRaises(MultipleObjectsReturned,
|
|
Article.objects.get, reporter_id=self.r.id)
|
|
self.assertEqual(repr(a3),
|
|
repr(Article.objects.get(reporter_id=self.r2.id,
|
|
pub_date=datetime(2011, 5, 7))))
|
|
|
|
def test_manager_class_caching(self):
|
|
r1 = Reporter.objects.create(first_name='Mike')
|
|
r2 = Reporter.objects.create(first_name='John')
|
|
|
|
# Same twice
|
|
self.assertTrue(r1.article_set.__class__ is r1.article_set.__class__)
|
|
|
|
# Same as each other
|
|
self.assertTrue(r1.article_set.__class__ is r2.article_set.__class__)
|