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Code Issues 25 Releases Wiki Activity
4df45418f2
django/tests/modeltests/lookup/tests.py
Jannis Leidel bce890ace4 Fixed #16584 -- Fixed a bunch of typos in code comments. Thanks, Bernhard Essl. 
git-svn-id: http://code.djangoproject.com/svn/django/trunk@16598 bcc190cf-cafb-0310-a4f2-bffc1f526a37
2011-08-12 14:14:15 +00:00

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from datetime import datetime
from operator import attrgetter
from django.core.exceptions import FieldError
from django.test import TestCase, skipUnlessDBFeature
from models import Author, Article, Tag
class LookupTests(TestCase):
#def setUp(self):
def setUp(self):
# Create a few Authors.
self.au1 = Author(name='Author 1')
self.au1.save()
self.au2 = Author(name='Author 2')
self.au2.save()
# Create a couple of Articles.
self.a1 = Article(headline='Article 1', pub_date=datetime(2005, 7, 26), author=self.au1)
self.a1.save()
self.a2 = Article(headline='Article 2', pub_date=datetime(2005, 7, 27), author=self.au1)
self.a2.save()
self.a3 = Article(headline='Article 3', pub_date=datetime(2005, 7, 27), author=self.au1)
self.a3.save()
self.a4 = Article(headline='Article 4', pub_date=datetime(2005, 7, 28), author=self.au1)
self.a4.save()
self.a5 = Article(headline='Article 5', pub_date=datetime(2005, 8, 1, 9, 0), author=self.au2)
self.a5.save()
self.a6 = Article(headline='Article 6', pub_date=datetime(2005, 8, 1, 8, 0), author=self.au2)
self.a6.save()
self.a7 = Article(headline='Article 7', pub_date=datetime(2005, 7, 27), author=self.au2)
self.a7.save()
# Create a few Tags.
self.t1 = Tag(name='Tag 1')
self.t1.save()
self.t1.articles.add(self.a1, self.a2, self.a3)
self.t2 = Tag(name='Tag 2')
self.t2.save()
self.t2.articles.add(self.a3, self.a4, self.a5)
self.t3 = Tag(name='Tag 3')
self.t3.save()
self.t3.articles.add(self.a5, self.a6, self.a7)
def test_exists(self):
# We can use .exists() to check that there are some
self.assertTrue(Article.objects.exists())
for a in Article.objects.all():
a.delete()
# There should be none now!
self.assertFalse(Article.objects.exists())
def test_lookup_int_as_str(self):
# Integer value can be queried using string
self.assertQuerysetEqual(Article.objects.filter(id__iexact=str(self.a1.id)),
['<Article: Article 1>'])
@skipUnlessDBFeature('supports_date_lookup_using_string')
def test_lookup_date_as_str(self):
# A date lookup can be performed using a string search
self.assertQuerysetEqual(Article.objects.filter(pub_date__startswith='2005'),
[
'<Article: Article 5>',
'<Article: Article 6>',
'<Article: Article 4>',
'<Article: Article 2>',
'<Article: Article 3>',
'<Article: Article 7>',
'<Article: Article 1>',
])
def test_iterator(self):
# Each QuerySet gets iterator(), which is a generator that "lazily"
# returns results using database-level iteration.
self.assertQuerysetEqual(Article.objects.iterator(),
[
'Article 5',
'Article 6',
'Article 4',
'Article 2',
'Article 3',
'Article 7',
'Article 1',
],
transform=attrgetter('headline'))
# iterator() can be used on any QuerySet.
self.assertQuerysetEqual(
Article.objects.filter(headline__endswith='4').iterator(),
['Article 4'],
transform=attrgetter('headline'))
def test_count(self):
# count() returns the number of objects matching search criteria.
self.assertEqual(Article.objects.count(), 7)
self.assertEqual(Article.objects.filter(pub_date__exact=datetime(2005, 7, 27)).count(), 3)
self.assertEqual(Article.objects.filter(headline__startswith='Blah blah').count(), 0)
# count() should respect sliced query sets.
articles = Article.objects.all()
self.assertEqual(articles.count(), 7)
self.assertEqual(articles[:4].count(), 4)
self.assertEqual(articles[1:100].count(), 6)
self.assertEqual(articles[10:100].count(), 0)
# Date and date/time lookups can also be done with strings.
self.assertEqual(Article.objects.filter(pub_date__exact='2005-07-27 00:00:00').count(), 3)
def test_in_bulk(self):
# in_bulk() takes a list of IDs and returns a dictionary mapping IDs to objects.
arts = Article.objects.in_bulk([self.a1.id, self.a2.id])
self.assertEqual(arts[self.a1.id], self.a1)
self.assertEqual(arts[self.a2.id], self.a2)
self.assertEqual(Article.objects.in_bulk([self.a3.id]), {self.a3.id: self.a3})
self.assertEqual(Article.objects.in_bulk(set([self.a3.id])), {self.a3.id: self.a3})
self.assertEqual(Article.objects.in_bulk(frozenset([self.a3.id])), {self.a3.id: self.a3})
self.assertEqual(Article.objects.in_bulk((self.a3.id,)), {self.a3.id: self.a3})
self.assertEqual(Article.objects.in_bulk([1000]), {})
self.assertEqual(Article.objects.in_bulk([]), {})
self.assertEqual(Article.objects.in_bulk(iter([self.a1.id])), {self.a1.id: self.a1})
self.assertEqual(Article.objects.in_bulk(iter([])), {})
self.assertRaises(TypeError, Article.objects.in_bulk)
self.assertRaises(TypeError, Article.objects.in_bulk, headline__startswith='Blah')
def test_values(self):
# values() returns a list of dictionaries instead of object instances --
# and you can specify which fields you want to retrieve.
identity = lambda x:x
self.assertQuerysetEqual(Article.objects.values('headline'),
[
{'headline': u'Article 5'},
{'headline': u'Article 6'},
{'headline': u'Article 4'},
{'headline': u'Article 2'},
{'headline': u'Article 3'},
{'headline': u'Article 7'},
{'headline': u'Article 1'},
],
transform=identity)
self.assertQuerysetEqual(
Article.objects.filter(pub_date__exact=datetime(2005, 7, 27)).values('id'),
[{'id': self.a2.id}, {'id': self.a3.id}, {'id': self.a7.id}],
transform=identity)
self.assertQuerysetEqual(Article.objects.values('id', 'headline'),
[
{'id': self.a5.id, 'headline': 'Article 5'},
{'id': self.a6.id, 'headline': 'Article 6'},
{'id': self.a4.id, 'headline': 'Article 4'},
{'id': self.a2.id, 'headline': 'Article 2'},
{'id': self.a3.id, 'headline': 'Article 3'},
{'id': self.a7.id, 'headline': 'Article 7'},
{'id': self.a1.id, 'headline': 'Article 1'},
],
transform=identity)
# You can use values() with iterator() for memory savings,
# because iterator() uses database-level iteration.
self.assertQuerysetEqual(Article.objects.values('id', 'headline').iterator(),
[
{'headline': u'Article 5', 'id': self.a5.id},
{'headline': u'Article 6', 'id': self.a6.id},
{'headline': u'Article 4', 'id': self.a4.id},
{'headline': u'Article 2', 'id': self.a2.id},
{'headline': u'Article 3', 'id': self.a3.id},
{'headline': u'Article 7', 'id': self.a7.id},
{'headline': u'Article 1', 'id': self.a1.id},
],
transform=identity)
# The values() method works with "extra" fields specified in extra(select).
self.assertQuerysetEqual(
Article.objects.extra(select={'id_plus_one': 'id + 1'}).values('id', 'id_plus_one'),
[
{'id': self.a5.id, 'id_plus_one': self.a5.id + 1},
{'id': self.a6.id, 'id_plus_one': self.a6.id + 1},
{'id': self.a4.id, 'id_plus_one': self.a4.id + 1},
{'id': self.a2.id, 'id_plus_one': self.a2.id + 1},
{'id': self.a3.id, 'id_plus_one': self.a3.id + 1},
{'id': self.a7.id, 'id_plus_one': self.a7.id + 1},
{'id': self.a1.id, 'id_plus_one': self.a1.id + 1},
],
transform=identity)
data = {
'id_plus_one': 'id+1',
'id_plus_two': 'id+2',
'id_plus_three': 'id+3',
'id_plus_four': 'id+4',
'id_plus_five': 'id+5',
'id_plus_six': 'id+6',
'id_plus_seven': 'id+7',
'id_plus_eight': 'id+8',
}
self.assertQuerysetEqual(
Article.objects.filter(id=self.a1.id).extra(select=data).values(*data.keys()),
[{
'id_plus_one': self.a1.id + 1,
'id_plus_two': self.a1.id + 2,
'id_plus_three': self.a1.id + 3,
'id_plus_four': self.a1.id + 4,
'id_plus_five': self.a1.id + 5,
'id_plus_six': self.a1.id + 6,
'id_plus_seven': self.a1.id + 7,
'id_plus_eight': self.a1.id + 8,
}], transform=identity)
# You can specify fields from forward and reverse relations, just like filter().
self.assertQuerysetEqual(
Article.objects.values('headline', 'author__name'),
[
{'headline': self.a5.headline, 'author__name': self.au2.name},
{'headline': self.a6.headline, 'author__name': self.au2.name},
{'headline': self.a4.headline, 'author__name': self.au1.name},
{'headline': self.a2.headline, 'author__name': self.au1.name},
{'headline': self.a3.headline, 'author__name': self.au1.name},
{'headline': self.a7.headline, 'author__name': self.au2.name},
{'headline': self.a1.headline, 'author__name': self.au1.name},
], transform=identity)
self.assertQuerysetEqual(
Author.objects.values('name', 'article__headline').order_by('name', 'article__headline'),
[
{'name': self.au1.name, 'article__headline': self.a1.headline},
{'name': self.au1.name, 'article__headline': self.a2.headline},
{'name': self.au1.name, 'article__headline': self.a3.headline},
{'name': self.au1.name, 'article__headline': self.a4.headline},
{'name': self.au2.name, 'article__headline': self.a5.headline},
{'name': self.au2.name, 'article__headline': self.a6.headline},
{'name': self.au2.name, 'article__headline': self.a7.headline},
], transform=identity)
self.assertQuerysetEqual(
Author.objects.values('name', 'article__headline', 'article__tag__name').order_by('name', 'article__headline', 'article__tag__name'),
[
{'name': self.au1.name, 'article__headline': self.a1.headline, 'article__tag__name': self.t1.name},
{'name': self.au1.name, 'article__headline': self.a2.headline, 'article__tag__name': self.t1.name},
{'name': self.au1.name, 'article__headline': self.a3.headline, 'article__tag__name': self.t1.name},
{'name': self.au1.name, 'article__headline': self.a3.headline, 'article__tag__name': self.t2.name},
{'name': self.au1.name, 'article__headline': self.a4.headline, 'article__tag__name': self.t2.name},
{'name': self.au2.name, 'article__headline': self.a5.headline, 'article__tag__name': self.t2.name},
{'name': self.au2.name, 'article__headline': self.a5.headline, 'article__tag__name': self.t3.name},
{'name': self.au2.name, 'article__headline': self.a6.headline, 'article__tag__name': self.t3.name},
{'name': self.au2.name, 'article__headline': self.a7.headline, 'article__tag__name': self.t3.name},
], transform=identity)
# However, an exception FieldDoesNotExist will be thrown if you specify
# a non-existent field name in values() (a field that is neither in the
# model nor in extra(select)).
self.assertRaises(FieldError,
Article.objects.extra(select={'id_plus_one': 'id + 1'}).values,
'id', 'id_plus_two')
# If you don't specify field names to values(), all are returned.
self.assertQuerysetEqual(Article.objects.filter(id=self.a5.id).values(),
[{
'id': self.a5.id,
'author_id': self.au2.id,
'headline': 'Article 5',
'pub_date': datetime(2005, 8, 1, 9, 0)
}], transform=identity)
def test_values_list(self):
# values_list() is similar to values(), except that the results are
# returned as a list of tuples, rather than a list of dictionaries.
# Within each tuple, the order of the elements is the same as the order
# of fields in the values_list() call.
identity = lambda x:x
self.assertQuerysetEqual(Article.objects.values_list('headline'),
[
(u'Article 5',),
(u'Article 6',),
(u'Article 4',),
(u'Article 2',),
(u'Article 3',),
(u'Article 7',),
(u'Article 1',),
], transform=identity)
self.assertQuerysetEqual(Article.objects.values_list('id').order_by('id'),
[(self.a1.id,), (self.a2.id,), (self.a3.id,), (self.a4.id,), (self.a5.id,), (self.a6.id,), (self.a7.id,)],
transform=identity)
self.assertQuerysetEqual(
Article.objects.values_list('id', flat=True).order_by('id'),
[self.a1.id, self.a2.id, self.a3.id, self.a4.id, self.a5.id, self.a6.id, self.a7.id],
transform=identity)
self.assertQuerysetEqual(
Article.objects.extra(select={'id_plus_one': 'id+1'})
.order_by('id').values_list('id'),
[(self.a1.id,), (self.a2.id,), (self.a3.id,), (self.a4.id,), (self.a5.id,), (self.a6.id,), (self.a7.id,)],
transform=identity)
self.assertQuerysetEqual(
Article.objects.extra(select={'id_plus_one': 'id+1'})
.order_by('id').values_list('id_plus_one', 'id'),
[
(self.a1.id+1, self.a1.id),
(self.a2.id+1, self.a2.id),
(self.a3.id+1, self.a3.id),
(self.a4.id+1, self.a4.id),
(self.a5.id+1, self.a5.id),
(self.a6.id+1, self.a6.id),
(self.a7.id+1, self.a7.id)
],
transform=identity)
self.assertQuerysetEqual(
Article.objects.extra(select={'id_plus_one': 'id+1'})
.order_by('id').values_list('id', 'id_plus_one'),
[
(self.a1.id, self.a1.id+1),
(self.a2.id, self.a2.id+1),
(self.a3.id, self.a3.id+1),
(self.a4.id, self.a4.id+1),
(self.a5.id, self.a5.id+1),
(self.a6.id, self.a6.id+1),
(self.a7.id, self.a7.id+1)
],
transform=identity)
self.assertQuerysetEqual(
Author.objects.values_list('name', 'article__headline', 'article__tag__name').order_by('name', 'article__headline', 'article__tag__name'),
[
(self.au1.name, self.a1.headline, self.t1.name),
(self.au1.name, self.a2.headline, self.t1.name),
(self.au1.name, self.a3.headline, self.t1.name),
(self.au1.name, self.a3.headline, self.t2.name),
(self.au1.name, self.a4.headline, self.t2.name),
(self.au2.name, self.a5.headline, self.t2.name),
(self.au2.name, self.a5.headline, self.t3.name),
(self.au2.name, self.a6.headline, self.t3.name),
(self.au2.name, self.a7.headline, self.t3.name),
], transform=identity)
self.assertRaises(TypeError, Article.objects.values_list, 'id', 'headline', flat=True)
def test_get_next_previous_by(self):
# Every DateField and DateTimeField creates get_next_by_FOO() and
# get_previous_by_FOO() methods. In the case of identical date values,
# these methods will use the ID as a fallback check. This guarantees
# that no records are skipped or duplicated.
self.assertEqual(repr(self.a1.get_next_by_pub_date()),
'<Article: Article 2>')
self.assertEqual(repr(self.a2.get_next_by_pub_date()),
'<Article: Article 3>')
self.assertEqual(repr(self.a2.get_next_by_pub_date(headline__endswith='6')),
'<Article: Article 6>')
self.assertEqual(repr(self.a3.get_next_by_pub_date()),
'<Article: Article 7>')
self.assertEqual(repr(self.a4.get_next_by_pub_date()),
'<Article: Article 6>')
self.assertRaises(Article.DoesNotExist, self.a5.get_next_by_pub_date)
self.assertEqual(repr(self.a6.get_next_by_pub_date()),
'<Article: Article 5>')
self.assertEqual(repr(self.a7.get_next_by_pub_date()),
'<Article: Article 4>')
self.assertEqual(repr(self.a7.get_previous_by_pub_date()),
'<Article: Article 3>')
self.assertEqual(repr(self.a6.get_previous_by_pub_date()),
'<Article: Article 4>')
self.assertEqual(repr(self.a5.get_previous_by_pub_date()),
'<Article: Article 6>')
self.assertEqual(repr(self.a4.get_previous_by_pub_date()),
'<Article: Article 7>')
self.assertEqual(repr(self.a3.get_previous_by_pub_date()),
'<Article: Article 2>')
self.assertEqual(repr(self.a2.get_previous_by_pub_date()),
'<Article: Article 1>')
def test_escaping(self):
# Underscores, percent signs and backslashes have special meaning in the
# underlying SQL code, but Django handles the quoting of them automatically.
a8 = Article(headline='Article_ with underscore', pub_date=datetime(2005, 11, 20))
a8.save()
self.assertQuerysetEqual(Article.objects.filter(headline__startswith='Article'),
[
'<Article: Article_ with underscore>',
'<Article: Article 5>',
'<Article: Article 6>',
'<Article: Article 4>',
'<Article: Article 2>',
'<Article: Article 3>',
'<Article: Article 7>',
'<Article: Article 1>',
])
self.assertQuerysetEqual(Article.objects.filter(headline__startswith='Article_'),
['<Article: Article_ with underscore>'])
a9 = Article(headline='Article% with percent sign', pub_date=datetime(2005, 11, 21))
a9.save()
self.assertQuerysetEqual(Article.objects.filter(headline__startswith='Article'),
[
'<Article: Article% with percent sign>',
'<Article: Article_ with underscore>',
'<Article: Article 5>',
'<Article: Article 6>',
'<Article: Article 4>',
'<Article: Article 2>',
'<Article: Article 3>',
'<Article: Article 7>',
'<Article: Article 1>',
])
self.assertQuerysetEqual(Article.objects.filter(headline__startswith='Article%'),
['<Article: Article% with percent sign>'])
a10 = Article(headline='Article with \\ backslash', pub_date=datetime(2005, 11, 22))
a10.save()
self.assertQuerysetEqual(Article.objects.filter(headline__contains='\\'),
['<Article: Article with \ backslash>'])
def test_exclude(self):
a8 = Article.objects.create(headline='Article_ with underscore', pub_date=datetime(2005, 11, 20))
a9 = Article.objects.create(headline='Article% with percent sign', pub_date=datetime(2005, 11, 21))
a10 = Article.objects.create(headline='Article with \\ backslash', pub_date=datetime(2005, 11, 22))
# exclude() is the opposite of filter() when doing lookups:
self.assertQuerysetEqual(
Article.objects.filter(headline__contains='Article').exclude(headline__contains='with'),
[
'<Article: Article 5>',
'<Article: Article 6>',
'<Article: Article 4>',
'<Article: Article 2>',
'<Article: Article 3>',
'<Article: Article 7>',
'<Article: Article 1>',
])
self.assertQuerysetEqual(Article.objects.exclude(headline__startswith="Article_"),
[
'<Article: Article with \\ backslash>',
'<Article: Article% with percent sign>',
'<Article: Article 5>',
'<Article: Article 6>',
'<Article: Article 4>',
'<Article: Article 2>',
'<Article: Article 3>',
'<Article: Article 7>',
'<Article: Article 1>',
])
self.assertQuerysetEqual(Article.objects.exclude(headline="Article 7"),
[
'<Article: Article with \\ backslash>',
'<Article: Article% with percent sign>',
'<Article: Article_ with underscore>',
'<Article: Article 5>',
'<Article: Article 6>',
'<Article: Article 4>',
'<Article: Article 2>',
'<Article: Article 3>',
'<Article: Article 1>',
])
def test_none(self):
# none() returns an EmptyQuerySet that behaves like any other QuerySet object
self.assertQuerysetEqual(Article.objects.none(), [])
self.assertQuerysetEqual(
Article.objects.none().filter(headline__startswith='Article'), [])
self.assertQuerysetEqual(
Article.objects.filter(headline__startswith='Article').none(), [])
self.assertEqual(Article.objects.none().count(), 0)
self.assertEqual(
Article.objects.none().update(headline="This should not take effect"), 0)
self.assertQuerysetEqual(
[article for article in Article.objects.none().iterator()],
[])
def test_in(self):
# using __in with an empty list should return an empty query set
self.assertQuerysetEqual(Article.objects.filter(id__in=[]), [])
self.assertQuerysetEqual(Article.objects.exclude(id__in=[]),
[
'<Article: Article 5>',
'<Article: Article 6>',
'<Article: Article 4>',
'<Article: Article 2>',
'<Article: Article 3>',
'<Article: Article 7>',
'<Article: Article 1>',
])
def test_error_messages(self):
# Programming errors are pointed out with nice error messages
try:
Article.objects.filter(pub_date_year='2005').count()
self.fail('FieldError not raised')
except FieldError, ex:
self.assertEqual(str(ex), "Cannot resolve keyword 'pub_date_year' "
"into field. Choices are: author, headline, id, pub_date, tag")
try:
Article.objects.filter(headline__starts='Article')
self.fail('FieldError not raised')
except FieldError, ex:
self.assertEqual(str(ex), "Join on field 'headline' not permitted. "
"Did you misspell 'starts' for the lookup type?")
def test_regex(self):
# Create some articles with a bit more interesting headlines for testing field lookups:
for a in Article.objects.all():
a.delete()
now = datetime.now()
a1 = Article(pub_date=now, headline='f')
a1.save()
a2 = Article(pub_date=now, headline='fo')
a2.save()
a3 = Article(pub_date=now, headline='foo')
a3.save()
a4 = Article(pub_date=now, headline='fooo')
a4.save()
a5 = Article(pub_date=now, headline='hey-Foo')
a5.save()
a6 = Article(pub_date=now, headline='bar')
a6.save()
a7 = Article(pub_date=now, headline='AbBa')
a7.save()
a8 = Article(pub_date=now, headline='baz')
a8.save()
a9 = Article(pub_date=now, headline='baxZ')
a9.save()
# zero-or-more
self.assertQuerysetEqual(Article.objects.filter(headline__regex=r'fo*'),
['<Article: f>', '<Article: fo>', '<Article: foo>', '<Article: fooo>'])
self.assertQuerysetEqual(Article.objects.filter(headline__iregex=r'fo*'),
[
'<Article: f>',
'<Article: fo>',
'<Article: foo>',
'<Article: fooo>',
'<Article: hey-Foo>',
])
# one-or-more
self.assertQuerysetEqual(Article.objects.filter(headline__regex=r'fo+'),
['<Article: fo>', '<Article: foo>', '<Article: fooo>'])
# wildcard
self.assertQuerysetEqual(Article.objects.filter(headline__regex=r'fooo?'),
['<Article: foo>', '<Article: fooo>'])
# leading anchor
self.assertQuerysetEqual(Article.objects.filter(headline__regex=r'^b'),
['<Article: bar>', '<Article: baxZ>', '<Article: baz>'])
self.assertQuerysetEqual(Article.objects.filter(headline__iregex=r'^a'),
['<Article: AbBa>'])
# trailing anchor
self.assertQuerysetEqual(Article.objects.filter(headline__regex=r'z$'),
['<Article: baz>'])
self.assertQuerysetEqual(Article.objects.filter(headline__iregex=r'z$'),
['<Article: baxZ>', '<Article: baz>'])
# character sets
self.assertQuerysetEqual(Article.objects.filter(headline__regex=r'ba[rz]'),
['<Article: bar>', '<Article: baz>'])
self.assertQuerysetEqual(Article.objects.filter(headline__regex=r'ba.[RxZ]'),
['<Article: baxZ>'])
self.assertQuerysetEqual(Article.objects.filter(headline__iregex=r'ba[RxZ]'),
['<Article: bar>', '<Article: baxZ>', '<Article: baz>'])
# and more articles:
a10 = Article(pub_date=now, headline='foobar')
a10.save()
a11 = Article(pub_date=now, headline='foobaz')
a11.save()
a12 = Article(pub_date=now, headline='ooF')
a12.save()
a13 = Article(pub_date=now, headline='foobarbaz')
a13.save()
a14 = Article(pub_date=now, headline='zoocarfaz')
a14.save()
a15 = Article(pub_date=now, headline='barfoobaz')
a15.save()
a16 = Article(pub_date=now, headline='bazbaRFOO')
a16.save()
# alternation
self.assertQuerysetEqual(Article.objects.filter(headline__regex=r'oo(f|b)'),
[
'<Article: barfoobaz>',
'<Article: foobar>',
'<Article: foobarbaz>',
'<Article: foobaz>',
])
self.assertQuerysetEqual(Article.objects.filter(headline__iregex=r'oo(f|b)'),
[
'<Article: barfoobaz>',
'<Article: foobar>',
'<Article: foobarbaz>',
'<Article: foobaz>',
'<Article: ooF>',
])
self.assertQuerysetEqual(Article.objects.filter(headline__regex=r'^foo(f|b)'),
['<Article: foobar>', '<Article: foobarbaz>', '<Article: foobaz>'])
# greedy matching
self.assertQuerysetEqual(Article.objects.filter(headline__regex=r'b.*az'),
[
'<Article: barfoobaz>',
'<Article: baz>',
'<Article: bazbaRFOO>',
'<Article: foobarbaz>',
'<Article: foobaz>',
])
self.assertQuerysetEqual(Article.objects.filter(headline__iregex=r'b.*ar'),
[
'<Article: bar>',
'<Article: barfoobaz>',
'<Article: bazbaRFOO>',
'<Article: foobar>',
'<Article: foobarbaz>',
])
@skipUnlessDBFeature('supports_regex_backreferencing')
def test_regex_backreferencing(self):
# grouping and backreferences
now = datetime.now()
a10 = Article(pub_date=now, headline='foobar')
a10.save()
a11 = Article(pub_date=now, headline='foobaz')
a11.save()
a12 = Article(pub_date=now, headline='ooF')
a12.save()
a13 = Article(pub_date=now, headline='foobarbaz')
a13.save()
a14 = Article(pub_date=now, headline='zoocarfaz')
a14.save()
a15 = Article(pub_date=now, headline='barfoobaz')
a15.save()
a16 = Article(pub_date=now, headline='bazbaRFOO')
a16.save()
self.assertQuerysetEqual(Article.objects.filter(headline__regex=r'b(.).*b\1'),
['<Article: barfoobaz>', '<Article: bazbaRFOO>', '<Article: foobarbaz>'])
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