def test_selects(self):
        new_article = self.r.article_set.create(headline="John's second story",
                                                pub_date=datetime(2005, 7, 29))
        new_article2 = self.r2.article_set.create(headline="Paul's story",
                                                  pub_date=datetime(2006, 1, 17))
        # Reporter objects have access to their related Article objects.
        self.assertQuerysetEqual(self.r.article_set.all(), [
            "<Article: John's second story>",
            "<Article: This is a test>",
        ])
        self.assertQuerysetEqual(self.r.article_set.filter(headline__startswith='This'),
                                 ["<Article: This is a test>"])
        self.assertEqual(self.r.article_set.count(), 2)
        self.assertEqual(self.r2.article_set.count(), 1)
        # Get articles by id
        self.assertQuerysetEqual(Article.objects.filter(id__exact=self.a.id),
                                 ["<Article: This is a test>"])
        self.assertQuerysetEqual(Article.objects.filter(pk=self.a.id),
                                 ["<Article: This is a test>"])
        # Query on an article property
        self.assertQuerysetEqual(Article.objects.filter(headline__startswith='This'),
                                 ["<Article: This is a test>"])
        # The API automatically follows relationships as far as you need.
        # Use double underscores to separate relationships.
        # This works as many levels deep as you want. There's no limit.
        # Find all Articles for any Reporter whose first name is "John".
        self.assertQuerysetEqual(Article.objects.filter(reporter__first_name__exact='John'),
            [
                "<Article: John's second story>",
                "<Article: This is a test>",
            ])
        # Check that implied __exact also works
        self.assertQuerysetEqual(Article.objects.filter(reporter__first_name='John'),
            [
                "<Article: John's second story>",
                "<Article: This is a test>",
            ])
        # Query twice over the related field.
        self.assertQuerysetEqual(
            Article.objects.filter(reporter__first_name__exact='John',
                                   reporter__last_name__exact='Smith'),
            [
                "<Article: John's second story>",
                "<Article: This is a test>",
            ])
        # The underlying query only makes one join when a related table is referenced twice.
        queryset = Article.objects.filter(reporter__first_name__exact='John',
                                       reporter__last_name__exact='Smith')
        self.assertNumQueries(1, list, queryset)
        self.assertEqual(queryset.query.get_compiler(queryset.db).as_sql()[0].count('INNER JOIN'), 1)

        # The automatically joined table has a predictable name.
        self.assertQuerysetEqual(
            Article.objects.filter(reporter__first_name__exact='John').extra(
                where=["many_to_one_reporter.last_name='Smith'"]),
            [
                "<Article: John's second story>",
                "<Article: This is a test>",
            ])
        # ... and should work fine with the unicode that comes out of forms.Form.cleaned_data
        self.assertQuerysetEqual(
            Article.objects.filter(reporter__first_name__exact='John'
                                  ).extra(where=["many_to_one_reporter.last_name='%s'" % 'Smith']),
            [
                "<Article: John's second story>",
                "<Article: This is a test>",
            ])
        # Find all Articles for a Reporter.
        # Use direct ID check, pk check, and object comparison
        self.assertQuerysetEqual(
            Article.objects.filter(reporter__id__exact=self.r.id),
            [
                "<Article: John's second story>",
                "<Article: This is a test>",
            ])
        self.assertQuerysetEqual(
            Article.objects.filter(reporter__pk=self.r.id),
            [
                "<Article: John's second story>",
                "<Article: This is a test>",
            ])
        self.assertQuerysetEqual(
            Article.objects.filter(reporter=self.r.id),
            [
                "<Article: John's second story>",
                "<Article: This is a test>",
            ])
        self.assertQuerysetEqual(
            Article.objects.filter(reporter=self.r),
            [
                "<Article: John's second story>",
                "<Article: This is a test>",
            ])
        self.assertQuerysetEqual(
            Article.objects.filter(reporter__in=[self.r.id,self.r2.id]).distinct(),
            [
                    "<Article: John's second story>",
                    "<Article: Paul's story>",
                    "<Article: This is a test>",
            ])
        self.assertQuerysetEqual(
            Article.objects.filter(reporter__in=[self.r,self.r2]).distinct(),
            [
                "<Article: John's second story>",
                "<Article: Paul's story>",
                "<Article: This is a test>",
            ])
        # You can also use a queryset instead of a literal list of instances.
        # The queryset must be reduced to a list of values using values(),
        # then converted into a query
        self.assertQuerysetEqual(
            Article.objects.filter(
                        reporter__in=Reporter.objects.filter(first_name='John').values('pk').query
                    ).distinct(),
            [
                "<Article: John's second story>",
                "<Article: This is a test>",
            ])
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/tests/modeltests/many_to_one/tests.py/ManyToOneTests.test_selects/original