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a2396a4c8f
The guarantee that no queries will be made when accessing results is done by new EmptyWhere class which is used for query.where and having. Thanks to Simon Charette for reviewing and valuable suggestions.
108 lines
3.5 KiB
Python
108 lines
3.5 KiB
Python
from __future__ import absolute_import
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from django.http import Http404
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from django.shortcuts import get_object_or_404, get_list_or_404
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from django.test import TestCase
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from .models import Author, Article
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class GetObjectOr404Tests(TestCase):
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def test_get_object_or_404(self):
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a1 = Author.objects.create(name="Brave Sir Robin")
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a2 = Author.objects.create(name="Patsy")
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# No Articles yet, so we should get a Http404 error.
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self.assertRaises(Http404, get_object_or_404, Article, title="Foo")
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article = Article.objects.create(title="Run away!")
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article.authors = [a1, a2]
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# get_object_or_404 can be passed a Model to query.
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self.assertEqual(
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get_object_or_404(Article, title__contains="Run"),
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article
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)
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# We can also use the Article manager through an Author object.
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self.assertEqual(
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get_object_or_404(a1.article_set, title__contains="Run"),
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article
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)
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# No articles containing "Camelot". This should raise a Http404 error.
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self.assertRaises(Http404,
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get_object_or_404, a1.article_set, title__contains="Camelot"
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)
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# Custom managers can be used too.
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self.assertEqual(
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get_object_or_404(Article.by_a_sir, title="Run away!"),
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article
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)
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# QuerySets can be used too.
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self.assertEqual(
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get_object_or_404(Article.objects.all(), title__contains="Run"),
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article
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)
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# Just as when using a get() lookup, you will get an error if more than
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# one object is returned.
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self.assertRaises(Author.MultipleObjectsReturned,
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get_object_or_404, Author.objects.all()
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)
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# Using an empty QuerySet raises a Http404 error.
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self.assertRaises(Http404,
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get_object_or_404, Article.objects.none(), title__contains="Run"
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)
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# get_list_or_404 can be used to get lists of objects
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self.assertEqual(
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get_list_or_404(a1.article_set, title__icontains="Run"),
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[article]
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)
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# Http404 is returned if the list is empty.
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self.assertRaises(Http404,
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get_list_or_404, a1.article_set, title__icontains="Shrubbery"
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)
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# Custom managers can be used too.
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self.assertEqual(
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get_list_or_404(Article.by_a_sir, title__icontains="Run"),
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[article]
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)
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# QuerySets can be used too.
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self.assertEqual(
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get_list_or_404(Article.objects.all(), title__icontains="Run"),
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[article]
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)
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def test_bad_class(self):
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# Given an argument klass that is not a Model, Manager, or Queryset
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# raises a helpful ValueError message
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self.assertRaisesMessage(ValueError,
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"Object is of type 'str', but must be a Django Model, Manager, "
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"or QuerySet",
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get_object_or_404, "Article", title__icontains="Run"
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)
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class CustomClass(object):
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pass
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self.assertRaisesMessage(ValueError,
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"Object is of type 'CustomClass', but must be a Django Model, "
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"Manager, or QuerySet",
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get_object_or_404, CustomClass, title__icontains="Run"
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)
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# Works for lists too
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self.assertRaisesMessage(ValueError,
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"Object is of type 'list', but must be a Django Model, Manager, "
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"or QuerySet",
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get_list_or_404, [Article], title__icontains="Run"
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)
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