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POAdding extra filter to polls urls.py causes tests to fail
 

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  1. POAdding extra filter to polls urls.py causes tests to fail
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    <p>Following the tutorial at djangoproject, I have tried to have urls.py filter out the polls with no choices with the urlpattern below.</p> <pre><code>urlpatterns = patterns('', url(r'^$', ListView.as_view( queryset=Poll.objects.filter(choice__choice_text__isnull=False) \ .filter(pub_date__lte=timezone.now) \ .order_by('-pub_date')[:5], context_object_name='latest_polls', template_name='polls/index.html'), name='index'), url(r'^(?P&lt;pk&gt;\d+)/$', DetailView.as_view( queryset=Poll.objects.filter(choice__choice_text__isnull=False) \ .filter(pub_date__lte=timezone.now), model=Poll, template_name='polls/detail.html'), name='detail'), url(r'^(?P&lt;pk&gt;\d+)/results/$', DetailView.as_view( queryset=Poll.objects.filter(choice__choice_text__isnull=False) \ .filter(pub_date__lte=timezone.now), model=Poll, template_name='polls/results.html'), name='results'), url(r'^(?P&lt;poll_id&gt;\d+)/vote/$', 'polls.views.vote', name='vote'), ) </code></pre> <p>However, when I run the tests from the tutorial, an assertion error occurs for each test that creates a past_poll, similar to the error below.</p> <pre><code>AssertionError: Lists differ: [] != ['&lt;Poll: Past poll.&gt;'] Second list contains 1 additional elements. First extra element 0: &lt;Poll: Past poll.&gt; - [] + ['&lt;Poll: Past poll.&gt;'] </code></pre> <p>Before I changed the queryset to filter out all polls w/o choices the tests didn't fail. I have tested the filter in the shell and it works and running the app on the django server also doesn't seem to have any problems. What is going wrong?</p> <p>Here is the tests.py file that I used</p> <pre><code>import datetime from django.utils import timezone from django.core.urlresolvers import reverse from django.test import TestCase from polls.models import Poll def create_poll(question, days): """ Creates a poll with the given `question` published the given number of `days` offset to now (negative for polls published in the past, positive for polls that have yet to be published). """ return Poll.objects.create(question=question, pub_date=timezone.now() + datetime.timedelta(days=days)) class PollIndexDetailTests(TestCase): def test_detail_view_with_a_future_poll(self): """ The detail view of a poll with a pub_date in the future should return a 404 not found. """ future_poll = create_poll(question='Future poll.', days=5) response = self.client.get(reverse('polls:detail', args=(future_poll.id,))) self.assertEqual(response.status_code, 404) def test_detail_view_with_a_past_poll(self): """ The detail view of a poll with a pub_date in the past should display the poll's question. """ past_poll = create_poll(question='Past Poll.', days=-5) response = self.client.get(reverse('polls:detail', args=(past_poll.id,))) self.assertContains(response, past_poll.question, status_code=200) class PollIndexResultsTests(TestCase): def test_results_view_with_a_future_poll(self): """ The results view of a poll with a pub_date in the future should return a 404 not found. """ future_poll = create_poll(question='Future poll.', days=5) response = self.client.get(reverse('polls:results', args=(future_poll.id,))) self.assertEqual(response.status_code, 404) def test_results_view_with_a_past_poll(self): """ The results view of a poll with a pub_date in the past should display the poll's question. """ past_poll = create_poll(question='Past Poll.', days=-5) response = self.client.get(reverse('polls:results', args=(past_poll.id,))) self.assertContains(response, past_poll.question, status_code=200) class PollViewTests(TestCase): def test_index_view_with_no_polls(self): """ If no polls exist, an appropriate message should be displayed. """ response = self.client.get(reverse('polls:index')) self.assertEqual(response.status_code, 200) self.assertContains(response, "No polls are available.") self.assertQuerysetEqual(response.context['latest_polls'], []) def test_index_view_with_a_past_poll(self): """ Polls with a pub_date in the past should be displayed on the index page. """ create_poll(question="Past poll.", days=-30) response = self.client.get(reverse('polls:index')) self.assertQuerysetEqual( response.context['latest_polls'], ['&lt;Poll: Past poll.&gt;'] ) def test_index_view_with_a_future_poll(self): """ Polls with a pub_date in the future should not be displayed on the index page. """ create_poll(question="Future poll.", days=30) response = self.client.get(reverse('polls:index')) self.assertContains(response, "No polls are available.", status_code=200) self.assertQuerysetEqual(response.context['latest_polls'], []) def test_index_view_with_future_poll_and_past_poll(self): """ Even if both past and future polls exist, only past polls should be displayed. """ create_poll(question="Past poll.", days=-30) create_poll(question="Future poll.", days=30) response = self.client.get(reverse('polls:index')) self.assertQuerysetEqual( response.context['latest_polls'], ['&lt;Poll: Past poll.&gt;'] ) def test_index_view_with_two_past_polls(self): """ The polls index page may display multiple polls. """ create_poll(question="Past poll 1.", days=-30) create_poll(question="Past poll 2.", days=-5) response = self.client.get(reverse('polls:index')) self.assertQuerysetEqual( response.context['latest_polls'], ['&lt;Poll: Past poll 2.&gt;', '&lt;Poll: Past poll 1.&gt;'] ) class PollMethodTests(TestCase): def test_was_published_recently_with_future_poll(self): """ was_published_recently() should return False for polls whose pub_date is in the future """ future_poll = Poll(pub_date=timezone.now() + datetime.timedelta(days=30)) self.assertEqual(future_poll.was_published_recently(), False) def test_was_published_recently_with_old_poll(self): """ was_published_recently() should return False for polls whose pub_date is older than 1 day """ old_poll = Poll(pub_date=timezone.now() - datetime.timedelta(days=30)) self.assertEqual(old_poll.was_published_recently(), False) def test_was_published_recently_with_recent_poll(self): """ was_published_recently() should return True for polls whose pub_date is within the last day """ recent_poll = Poll(pub_date=timezone.now() - datetime.timedelta(hours=1)) self.assertEqual(recent_poll.was_published_recently(), True) </code></pre>
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