diff options
| author | Florian Apolloner <florian@apolloner.eu> | 2013-02-26 09:53:47 +0100 |
|---|---|---|
| committer | Florian Apolloner <florian@apolloner.eu> | 2013-02-26 14:36:57 +0100 |
| commit | 89f40e36246100df6a11316c31a76712ebc6c501 (patch) | |
| tree | 6e65639683ddaf2027908d1ecb1739e0e2ff853b /tests/modeltests/basic | |
| parent | b3d2ccb5bfbaf6e7fe1f98843baaa48c35a70950 (diff) | |
Merged regressiontests and modeltests into the test root.
Diffstat (limited to 'tests/modeltests/basic')
| -rw-r--r-- | tests/modeltests/basic/__init__.py | 0 | ||||
| -rw-r--r-- | tests/modeltests/basic/models.py | 20 | ||||
| -rw-r--r-- | tests/modeltests/basic/tests.py | 693 |
3 files changed, 0 insertions, 713 deletions
diff --git a/tests/modeltests/basic/__init__.py b/tests/modeltests/basic/__init__.py deleted file mode 100644 index e69de29bb2..0000000000 --- a/tests/modeltests/basic/__init__.py +++ /dev/null diff --git a/tests/modeltests/basic/models.py b/tests/modeltests/basic/models.py deleted file mode 100644 index 660beddf49..0000000000 --- a/tests/modeltests/basic/models.py +++ /dev/null @@ -1,20 +0,0 @@ -# coding: utf-8 -""" -1. Bare-bones model - -This is a basic model with only two non-primary-key fields. -""" -from django.db import models -from django.utils.encoding import python_2_unicode_compatible - - -@python_2_unicode_compatible -class Article(models.Model): - headline = models.CharField(max_length=100, default='Default headline') - pub_date = models.DateTimeField() - - class Meta: - ordering = ('pub_date','headline') - - def __str__(self): - return self.headline diff --git a/tests/modeltests/basic/tests.py b/tests/modeltests/basic/tests.py deleted file mode 100644 index 2de87a225f..0000000000 --- a/tests/modeltests/basic/tests.py +++ /dev/null @@ -1,693 +0,0 @@ -from __future__ import absolute_import, unicode_literals - -from datetime import datetime - -from django.core.exceptions import ObjectDoesNotExist, MultipleObjectsReturned, FieldError -from django.db.models.fields import Field, FieldDoesNotExist -from django.db.models.query import QuerySet, EmptyQuerySet, ValuesListQuerySet -from django.test import TestCase, skipIfDBFeature, skipUnlessDBFeature -from django.utils import six -from django.utils.translation import ugettext_lazy - -from .models import Article - - -class ModelTest(TestCase): - - def test_lookup(self): - # No articles are in the system yet. - self.assertQuerysetEqual(Article.objects.all(), []) - - # Create an Article. - a = Article( - id=None, - headline='Area man programs in Python', - pub_date=datetime(2005, 7, 28), - ) - - # Save it into the database. You have to call save() explicitly. - a.save() - - # Now it has an ID. - self.assertTrue(a.id != None) - - # Models have a pk property that is an alias for the primary key - # attribute (by default, the 'id' attribute). - self.assertEqual(a.pk, a.id) - - # Access database columns via Python attributes. - self.assertEqual(a.headline, 'Area man programs in Python') - self.assertEqual(a.pub_date, datetime(2005, 7, 28, 0, 0)) - - # Change values by changing the attributes, then calling save(). - a.headline = 'Area woman programs in Python' - a.save() - - # Article.objects.all() returns all the articles in the database. - self.assertQuerysetEqual(Article.objects.all(), - ['<Article: Area woman programs in Python>']) - - # Django provides a rich database lookup API. - self.assertEqual(Article.objects.get(id__exact=a.id), a) - self.assertEqual(Article.objects.get(headline__startswith='Area woman'), a) - self.assertEqual(Article.objects.get(pub_date__year=2005), a) - self.assertEqual(Article.objects.get(pub_date__year=2005, pub_date__month=7), a) - self.assertEqual(Article.objects.get(pub_date__year=2005, pub_date__month=7, pub_date__day=28), a) - self.assertEqual(Article.objects.get(pub_date__week_day=5), a) - - # The "__exact" lookup type can be omitted, as a shortcut. - self.assertEqual(Article.objects.get(id=a.id), a) - self.assertEqual(Article.objects.get(headline='Area woman programs in Python'), a) - - self.assertQuerysetEqual( - Article.objects.filter(pub_date__year=2005), - ['<Article: Area woman programs in Python>'], - ) - self.assertQuerysetEqual( - Article.objects.filter(pub_date__year=2004), - [], - ) - self.assertQuerysetEqual( - Article.objects.filter(pub_date__year=2005, pub_date__month=7), - ['<Article: Area woman programs in Python>'], - ) - - self.assertQuerysetEqual( - Article.objects.filter(pub_date__week_day=5), - ['<Article: Area woman programs in Python>'], - ) - self.assertQuerysetEqual( - Article.objects.filter(pub_date__week_day=6), - [], - ) - - # Django raises an Article.DoesNotExist exception for get() if the - # parameters don't match any object. - six.assertRaisesRegex(self, - ObjectDoesNotExist, - "Article matching query does not exist. Lookup parameters were " - "{'id__exact': 2000}", - Article.objects.get, - id__exact=2000, - ) - # To avoid dict-ordering related errors check only one lookup - # in single assert. - six.assertRaisesRegex(self, - ObjectDoesNotExist, - ".*'pub_date__year': 2005.*", - Article.objects.get, - pub_date__year=2005, - pub_date__month=8, - ) - six.assertRaisesRegex(self, - ObjectDoesNotExist, - ".*'pub_date__month': 8.*", - Article.objects.get, - pub_date__year=2005, - pub_date__month=8, - ) - - six.assertRaisesRegex(self, - ObjectDoesNotExist, - "Article matching query does not exist. Lookup parameters were " - "{'pub_date__week_day': 6}", - Article.objects.get, - pub_date__week_day=6, - ) - - # Lookup by a primary key is the most common case, so Django - # provides a shortcut for primary-key exact lookups. - # The following is identical to articles.get(id=a.id). - self.assertEqual(Article.objects.get(pk=a.id), a) - - # pk can be used as a shortcut for the primary key name in any query. - self.assertQuerysetEqual(Article.objects.filter(pk__in=[a.id]), - ["<Article: Area woman programs in Python>"]) - - # Model instances of the same type and same ID are considered equal. - a = Article.objects.get(pk=a.id) - b = Article.objects.get(pk=a.id) - self.assertEqual(a, b) - - # Create a very similar object - a = Article( - id=None, - headline='Area man programs in Python', - pub_date=datetime(2005, 7, 28), - ) - a.save() - - self.assertEqual(Article.objects.count(), 2) - - # Django raises an Article.MultipleObjectsReturned exception if the - # lookup matches more than one object - six.assertRaisesRegex(self, - MultipleObjectsReturned, - "get\(\) returned more than one Article -- it returned 2!", - Article.objects.get, - headline__startswith='Area', - ) - - six.assertRaisesRegex(self, - MultipleObjectsReturned, - "get\(\) returned more than one Article -- it returned 2!", - Article.objects.get, - pub_date__year=2005, - ) - - six.assertRaisesRegex(self, - MultipleObjectsReturned, - "get\(\) returned more than one Article -- it returned 2!", - Article.objects.get, - pub_date__year=2005, - pub_date__month=7, - ) - - def test_object_creation(self): - # Create an Article. - a = Article( - id=None, - headline='Area man programs in Python', - pub_date=datetime(2005, 7, 28), - ) - - # Save it into the database. You have to call save() explicitly. - a.save() - - # You can initialize a model instance using positional arguments, - # which should match the field order as defined in the model. - a2 = Article(None, 'Second article', datetime(2005, 7, 29)) - a2.save() - - self.assertNotEqual(a2.id, a.id) - self.assertEqual(a2.headline, 'Second article') - self.assertEqual(a2.pub_date, datetime(2005, 7, 29, 0, 0)) - - # ...or, you can use keyword arguments. - a3 = Article( - id=None, - headline='Third article', - pub_date=datetime(2005, 7, 30), - ) - a3.save() - - self.assertNotEqual(a3.id, a.id) - self.assertNotEqual(a3.id, a2.id) - self.assertEqual(a3.headline, 'Third article') - self.assertEqual(a3.pub_date, datetime(2005, 7, 30, 0, 0)) - - # You can also mix and match position and keyword arguments, but - # be sure not to duplicate field information. - a4 = Article(None, 'Fourth article', pub_date=datetime(2005, 7, 31)) - a4.save() - self.assertEqual(a4.headline, 'Fourth article') - - # Don't use invalid keyword arguments. - six.assertRaisesRegex(self, - TypeError, - "'foo' is an invalid keyword argument for this function", - Article, - id=None, - headline='Invalid', - pub_date=datetime(2005, 7, 31), - foo='bar', - ) - - # You can leave off the value for an AutoField when creating an - # object, because it'll get filled in automatically when you save(). - a5 = Article(headline='Article 6', pub_date=datetime(2005, 7, 31)) - a5.save() - self.assertEqual(a5.headline, 'Article 6') - - # If you leave off a field with "default" set, Django will use - # the default. - a6 = Article(pub_date=datetime(2005, 7, 31)) - a6.save() - self.assertEqual(a6.headline, 'Default headline') - - # For DateTimeFields, Django saves as much precision (in seconds) - # as you give it. - a7 = Article( - headline='Article 7', - pub_date=datetime(2005, 7, 31, 12, 30), - ) - a7.save() - self.assertEqual(Article.objects.get(id__exact=a7.id).pub_date, - datetime(2005, 7, 31, 12, 30)) - - a8 = Article( - headline='Article 8', - pub_date=datetime(2005, 7, 31, 12, 30, 45), - ) - a8.save() - self.assertEqual(Article.objects.get(id__exact=a8.id).pub_date, - datetime(2005, 7, 31, 12, 30, 45)) - - # Saving an object again doesn't create a new object -- it just saves - # the old one. - current_id = a8.id - a8.save() - self.assertEqual(a8.id, current_id) - a8.headline = 'Updated article 8' - a8.save() - self.assertEqual(a8.id, current_id) - - # Check that != and == operators behave as expecte on instances - self.assertTrue(a7 != a8) - self.assertFalse(a7 == a8) - self.assertEqual(a8, Article.objects.get(id__exact=a8.id)) - - self.assertTrue(Article.objects.get(id__exact=a8.id) != Article.objects.get(id__exact=a7.id)) - self.assertFalse(Article.objects.get(id__exact=a8.id) == Article.objects.get(id__exact=a7.id)) - - # You can use 'in' to test for membership... - self.assertTrue(a8 in Article.objects.all()) - - # ... but there will often be more efficient ways if that is all you need: - self.assertTrue(Article.objects.filter(id=a8.id).exists()) - - # datetimes() returns a list of available dates of the given scope for - # the given field. - self.assertQuerysetEqual( - Article.objects.datetimes('pub_date', 'year'), - ["datetime.datetime(2005, 1, 1, 0, 0)"]) - self.assertQuerysetEqual( - Article.objects.datetimes('pub_date', 'month'), - ["datetime.datetime(2005, 7, 1, 0, 0)"]) - self.assertQuerysetEqual( - Article.objects.datetimes('pub_date', 'day'), - ["datetime.datetime(2005, 7, 28, 0, 0)", - "datetime.datetime(2005, 7, 29, 0, 0)", - "datetime.datetime(2005, 7, 30, 0, 0)", - "datetime.datetime(2005, 7, 31, 0, 0)"]) - self.assertQuerysetEqual( - Article.objects.datetimes('pub_date', 'day', order='ASC'), - ["datetime.datetime(2005, 7, 28, 0, 0)", - "datetime.datetime(2005, 7, 29, 0, 0)", - "datetime.datetime(2005, 7, 30, 0, 0)", - "datetime.datetime(2005, 7, 31, 0, 0)"]) - self.assertQuerysetEqual( - Article.objects.datetimes('pub_date', 'day', order='DESC'), - ["datetime.datetime(2005, 7, 31, 0, 0)", - "datetime.datetime(2005, 7, 30, 0, 0)", - "datetime.datetime(2005, 7, 29, 0, 0)", - "datetime.datetime(2005, 7, 28, 0, 0)"]) - - # datetimes() requires valid arguments. - self.assertRaises( - TypeError, - Article.objects.dates, - ) - - six.assertRaisesRegex(self, - FieldDoesNotExist, - "Article has no field named 'invalid_field'", - Article.objects.dates, - "invalid_field", - "year", - ) - - six.assertRaisesRegex(self, - AssertionError, - "'kind' must be one of 'year', 'month' or 'day'.", - Article.objects.dates, - "pub_date", - "bad_kind", - ) - - six.assertRaisesRegex(self, - AssertionError, - "'order' must be either 'ASC' or 'DESC'.", - Article.objects.dates, - "pub_date", - "year", - order="bad order", - ) - - # Use iterator() with datetimes() to return a generator that lazily - # requests each result one at a time, to save memory. - dates = [] - for article in Article.objects.datetimes('pub_date', 'day', order='DESC').iterator(): - dates.append(article) - self.assertEqual(dates, [ - datetime(2005, 7, 31, 0, 0), - datetime(2005, 7, 30, 0, 0), - datetime(2005, 7, 29, 0, 0), - datetime(2005, 7, 28, 0, 0)]) - - # You can combine queries with & and |. - s1 = Article.objects.filter(id__exact=a.id) - s2 = Article.objects.filter(id__exact=a2.id) - self.assertQuerysetEqual(s1 | s2, - ["<Article: Area man programs in Python>", - "<Article: Second article>"]) - self.assertQuerysetEqual(s1 & s2, []) - - # You can get the number of objects like this: - self.assertEqual(len(Article.objects.filter(id__exact=a.id)), 1) - - # You can get items using index and slice notation. - self.assertEqual(Article.objects.all()[0], a) - self.assertQuerysetEqual(Article.objects.all()[1:3], - ["<Article: Second article>", "<Article: Third article>"]) - - s3 = Article.objects.filter(id__exact=a3.id) - self.assertQuerysetEqual((s1 | s2 | s3)[::2], - ["<Article: Area man programs in Python>", - "<Article: Third article>"]) - - # Slicing works with longs (Python 2 only -- Python 3 doesn't have longs). - if not six.PY3: - self.assertEqual(Article.objects.all()[long(0)], a) - self.assertQuerysetEqual(Article.objects.all()[long(1):long(3)], - ["<Article: Second article>", "<Article: Third article>"]) - self.assertQuerysetEqual((s1 | s2 | s3)[::long(2)], - ["<Article: Area man programs in Python>", - "<Article: Third article>"]) - - # And can be mixed with ints. - self.assertQuerysetEqual(Article.objects.all()[1:long(3)], - ["<Article: Second article>", "<Article: Third article>"]) - - # Slices (without step) are lazy: - self.assertQuerysetEqual(Article.objects.all()[0:5].filter(), - ["<Article: Area man programs in Python>", - "<Article: Second article>", - "<Article: Third article>", - "<Article: Article 6>", - "<Article: Default headline>"]) - - # Slicing again works: - self.assertQuerysetEqual(Article.objects.all()[0:5][0:2], - ["<Article: Area man programs in Python>", - "<Article: Second article>"]) - self.assertQuerysetEqual(Article.objects.all()[0:5][:2], - ["<Article: Area man programs in Python>", - "<Article: Second article>"]) - self.assertQuerysetEqual(Article.objects.all()[0:5][4:], - ["<Article: Default headline>"]) - self.assertQuerysetEqual(Article.objects.all()[0:5][5:], []) - - # Some more tests! - self.assertQuerysetEqual(Article.objects.all()[2:][0:2], - ["<Article: Third article>", "<Article: Article 6>"]) - self.assertQuerysetEqual(Article.objects.all()[2:][:2], - ["<Article: Third article>", "<Article: Article 6>"]) - self.assertQuerysetEqual(Article.objects.all()[2:][2:3], - ["<Article: Default headline>"]) - - # Using an offset without a limit is also possible. - self.assertQuerysetEqual(Article.objects.all()[5:], - ["<Article: Fourth article>", - "<Article: Article 7>", - "<Article: Updated article 8>"]) - - # Also, once you have sliced you can't filter, re-order or combine - six.assertRaisesRegex(self, - AssertionError, - "Cannot filter a query once a slice has been taken.", - Article.objects.all()[0:5].filter, - id=a.id, - ) - - six.assertRaisesRegex(self, - AssertionError, - "Cannot reorder a query once a slice has been taken.", - Article.objects.all()[0:5].order_by, - 'id', - ) - - try: - Article.objects.all()[0:1] & Article.objects.all()[4:5] - self.fail('Should raise an AssertionError') - except AssertionError as e: - self.assertEqual(str(e), "Cannot combine queries once a slice has been taken.") - except Exception as e: - self.fail('Should raise an AssertionError, not %s' % e) - - # Negative slices are not supported, due to database constraints. - # (hint: inverting your ordering might do what you need). - try: - Article.objects.all()[-1] - self.fail('Should raise an AssertionError') - except AssertionError as e: - self.assertEqual(str(e), "Negative indexing is not supported.") - except Exception as e: - self.fail('Should raise an AssertionError, not %s' % e) - - error = None - try: - Article.objects.all()[0:-5] - except Exception as e: - error = e - self.assertTrue(isinstance(error, AssertionError)) - self.assertEqual(str(error), "Negative indexing is not supported.") - - # An Article instance doesn't have access to the "objects" attribute. - # That's only available on the class. - six.assertRaisesRegex(self, - AttributeError, - "Manager isn't accessible via Article instances", - getattr, - a7, - "objects", - ) - - # Bulk delete test: How many objects before and after the delete? - self.assertQuerysetEqual(Article.objects.all(), - ["<Article: Area man programs in Python>", - "<Article: Second article>", - "<Article: Third article>", - "<Article: Article 6>", - "<Article: Default headline>", - "<Article: Fourth article>", - "<Article: Article 7>", - "<Article: Updated article 8>"]) - Article.objects.filter(id__lte=a4.id).delete() - self.assertQuerysetEqual(Article.objects.all(), - ["<Article: Article 6>", - "<Article: Default headline>", - "<Article: Article 7>", - "<Article: Updated article 8>"]) - - @skipUnlessDBFeature('supports_microsecond_precision') - def test_microsecond_precision(self): - # In PostgreSQL, microsecond-level precision is available. - a9 = Article( - headline='Article 9', - pub_date=datetime(2005, 7, 31, 12, 30, 45, 180), - ) - a9.save() - self.assertEqual(Article.objects.get(pk=a9.pk).pub_date, - datetime(2005, 7, 31, 12, 30, 45, 180)) - - @skipIfDBFeature('supports_microsecond_precision') - def test_microsecond_precision_not_supported(self): - # In MySQL, microsecond-level precision isn't available. You'll lose - # microsecond-level precision once the data is saved. - a9 = Article( - headline='Article 9', - pub_date=datetime(2005, 7, 31, 12, 30, 45, 180), - ) - a9.save() - self.assertEqual(Article.objects.get(id__exact=a9.id).pub_date, - datetime(2005, 7, 31, 12, 30, 45)) - - def test_manually_specify_primary_key(self): - # You can manually specify the primary key when creating a new object. - a101 = Article( - id=101, - headline='Article 101', - pub_date=datetime(2005, 7, 31, 12, 30, 45), - ) - a101.save() - a101 = Article.objects.get(pk=101) - self.assertEqual(a101.headline, 'Article 101') - - def test_create_method(self): - # You can create saved objects in a single step - a10 = Article.objects.create( - headline="Article 10", - pub_date=datetime(2005, 7, 31, 12, 30, 45), - ) - self.assertEqual(Article.objects.get(headline="Article 10"), a10) - - def test_year_lookup_edge_case(self): - # Edge-case test: A year lookup should retrieve all objects in - # the given year, including Jan. 1 and Dec. 31. - a11 = Article.objects.create( - headline='Article 11', - pub_date=datetime(2008, 1, 1), - ) - a12 = Article.objects.create( - headline='Article 12', - pub_date=datetime(2008, 12, 31, 23, 59, 59, 999999), - ) - self.assertQuerysetEqual(Article.objects.filter(pub_date__year=2008), - ["<Article: Article 11>", "<Article: Article 12>"]) - - def test_unicode_data(self): - # Unicode data works, too. - a = Article( - headline='\u6797\u539f \u3081\u3050\u307f', - pub_date=datetime(2005, 7, 28), - ) - a.save() - self.assertEqual(Article.objects.get(pk=a.id).headline, - '\u6797\u539f \u3081\u3050\u307f') - - def test_hash_function(self): - # Model instances have a hash function, so they can be used in sets - # or as dictionary keys. Two models compare as equal if their primary - # keys are equal. - a10 = Article.objects.create( - headline="Article 10", - pub_date=datetime(2005, 7, 31, 12, 30, 45), - ) - a11 = Article.objects.create( - headline='Article 11', - pub_date=datetime(2008, 1, 1), - ) - a12 = Article.objects.create( - headline='Article 12', - pub_date=datetime(2008, 12, 31, 23, 59, 59, 999999), - ) - - s = set([a10, a11, a12]) - self.assertTrue(Article.objects.get(headline='Article 11') in s) - - def test_field_ordering(self): - """ - Field instances have a `__lt__` comparison function to define an - ordering based on their creation. Prior to #17851 this ordering - comparison relied on the now unsupported `__cmp__` and was assuming - compared objects were both Field instances raising `AttributeError` - when it should have returned `NotImplemented`. - """ - f1 = Field() - f2 = Field(auto_created=True) - f3 = Field() - self.assertTrue(f2 < f1) - self.assertTrue(f3 > f1) - self.assertFalse(f1 == None) - self.assertFalse(f2 in (None, 1, '')) - - def test_extra_method_select_argument_with_dashes_and_values(self): - # The 'select' argument to extra() supports names with dashes in - # them, as long as you use values(). - a10 = Article.objects.create( - headline="Article 10", - pub_date=datetime(2005, 7, 31, 12, 30, 45), - ) - a11 = Article.objects.create( - headline='Article 11', - pub_date=datetime(2008, 1, 1), - ) - a12 = Article.objects.create( - headline='Article 12', - pub_date=datetime(2008, 12, 31, 23, 59, 59, 999999), - ) - - dicts = Article.objects.filter( - pub_date__year=2008).extra( - select={'dashed-value': '1'} - ).values('headline', 'dashed-value') - self.assertEqual([sorted(d.items()) for d in dicts], - [[('dashed-value', 1), ('headline', 'Article 11')], [('dashed-value', 1), ('headline', 'Article 12')]]) - - def test_extra_method_select_argument_with_dashes(self): - # If you use 'select' with extra() and names containing dashes on a - # query that's *not* a values() query, those extra 'select' values - # will silently be ignored. - a10 = Article.objects.create( - headline="Article 10", - pub_date=datetime(2005, 7, 31, 12, 30, 45), - ) - a11 = Article.objects.create( - headline='Article 11', - pub_date=datetime(2008, 1, 1), - ) - a12 = Article.objects.create( - headline='Article 12', - pub_date=datetime(2008, 12, 31, 23, 59, 59, 999999), - ) - - articles = Article.objects.filter( - pub_date__year=2008).extra( - select={'dashed-value': '1', 'undashedvalue': '2'}) - self.assertEqual(articles[0].undashedvalue, 2) - - def test_create_relation_with_ugettext_lazy(self): - """ - Test that ugettext_lazy objects work when saving model instances - through various methods. Refs #10498. - """ - notlazy = 'test' - lazy = ugettext_lazy(notlazy) - reporter = Article.objects.create(headline=lazy, pub_date=datetime.now()) - article = Article.objects.get() - self.assertEqual(article.headline, notlazy) - # test that assign + save works with Promise objecs - article.headline = lazy - article.save() - self.assertEqual(article.headline, notlazy) - # test .update() - Article.objects.update(headline=lazy) - article = Article.objects.get() - self.assertEqual(article.headline, notlazy) - # still test bulk_create() - Article.objects.all().delete() - Article.objects.bulk_create([Article(headline=lazy, pub_date=datetime.now())]) - article = Article.objects.get() - self.assertEqual(article.headline, notlazy) - - def test_emptyqs(self): - # Can't be instantiated - with self.assertRaises(TypeError): - EmptyQuerySet() - self.assertTrue(isinstance(Article.objects.none(), EmptyQuerySet)) - - def test_emptyqs_values(self): - # test for #15959 - Article.objects.create(headline='foo', pub_date=datetime.now()) - with self.assertNumQueries(0): - qs = Article.objects.none().values_list('pk') - self.assertTrue(isinstance(qs, EmptyQuerySet)) - self.assertTrue(isinstance(qs, ValuesListQuerySet)) - self.assertEqual(len(qs), 0) - - def test_emptyqs_customqs(self): - # A hacky test for custom QuerySet subclass - refs #17271 - Article.objects.create(headline='foo', pub_date=datetime.now()) - class CustomQuerySet(QuerySet): - def do_something(self): - return 'did something' - - qs = Article.objects.all() - qs.__class__ = CustomQuerySet - qs = qs.none() - with self.assertNumQueries(0): - self.assertEqual(len(qs), 0) - self.assertTrue(isinstance(qs, EmptyQuerySet)) - self.assertEqual(qs.do_something(), 'did something') - - def test_emptyqs_values_order(self): - # Tests for ticket #17712 - Article.objects.create(headline='foo', pub_date=datetime.now()) - with self.assertNumQueries(0): - self.assertEqual(len(Article.objects.none().values_list('id').order_by('id')), 0) - with self.assertNumQueries(0): - self.assertEqual(len(Article.objects.none().filter( - id__in=Article.objects.values_list('id', flat=True))), 0) - - @skipUnlessDBFeature('can_distinct_on_fields') - def test_emptyqs_distinct(self): - # Tests for #19426 - Article.objects.create(headline='foo', pub_date=datetime.now()) - with self.assertNumQueries(0): - self.assertEqual(len(Article.objects.none().distinct('headline', 'pub_date')), 0) - - def test_invalid_qs_list(self): - qs = Article.objects.order_by('invalid_column') - self.assertRaises(FieldError, list, qs) - self.assertRaises(FieldError, list, qs)
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