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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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