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97 lines
3.5 KiB
Python
97 lines
3.5 KiB
Python
from django.http import Http404
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from django.shortcuts import get_list_or_404, get_object_or_404
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from django.test import TestCase
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from .models import Article, Author
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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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with self.assertRaises(Http404):
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get_object_or_404(Article, title="Foo")
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article = Article.objects.create(title="Run away!")
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article.authors.set([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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with self.assertRaises(Http404):
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get_object_or_404(a1.article_set, title__contains="Camelot")
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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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with self.assertRaises(Author.MultipleObjectsReturned):
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get_object_or_404(Author.objects.all())
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# Using an empty QuerySet raises a Http404 error.
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with self.assertRaises(Http404):
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get_object_or_404(Article.objects.none(), title__contains="Run")
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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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with self.assertRaises(Http404):
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get_list_or_404(a1.article_set, title__icontains="Shrubbery")
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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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msg = "First argument to get_object_or_404() must be a Model, Manager, or QuerySet, not 'str'."
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with self.assertRaisesMessage(ValueError, msg):
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get_object_or_404("Article", title__icontains="Run")
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class CustomClass:
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pass
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msg = "First argument to get_object_or_404() must be a Model, Manager, or QuerySet, not 'CustomClass'."
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with self.assertRaisesMessage(ValueError, msg):
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get_object_or_404(CustomClass, title__icontains="Run")
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# Works for lists too
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msg = "First argument to get_list_or_404() must be a Model, Manager, or QuerySet, not 'list'."
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with self.assertRaisesMessage(ValueError, msg):
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get_list_or_404([Article], title__icontains="Run")
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