from datetime import datetime from django.test import TestCase from .models import Article, Category class M2MMultipleTests(TestCase): def test_multiple(self): c1, c2, c3, c4 = [ Category.objects.create(name=name) for name in ["Sports", "News", "Crime", "Life"] ] a1 = Article.objects.create( headline="Parrot steals", pub_date=datetime(2005, 11, 27) ) a1.primary_categories.add(c2, c3) a1.secondary_categories.add(c4) a2 = Article.objects.create( headline="Parrot runs", pub_date=datetime(2005, 11, 28) ) a2.primary_categories.add(c1, c2) a2.secondary_categories.add(c4) self.assertQuerySetEqual( a1.primary_categories.all(), [ "Crime", "News", ], lambda c: c.name, ) self.assertQuerySetEqual( a2.primary_categories.all(), [ "News", "Sports", ], lambda c: c.name, ) self.assertQuerySetEqual( a1.secondary_categories.all(), [ "Life", ], lambda c: c.name, ) self.assertQuerySetEqual( c1.primary_article_set.all(), [ "Parrot runs", ], lambda a: a.headline, ) self.assertQuerySetEqual(c1.secondary_article_set.all(), []) self.assertQuerySetEqual( c2.primary_article_set.all(), [ "Parrot steals", "Parrot runs", ], lambda a: a.headline, ) self.assertQuerySetEqual(c2.secondary_article_set.all(), []) self.assertQuerySetEqual( c3.primary_article_set.all(), [ "Parrot steals", ], lambda a: a.headline, ) self.assertQuerySetEqual(c3.secondary_article_set.all(), []) self.assertQuerySetEqual(c4.primary_article_set.all(), []) self.assertQuerySetEqual( c4.secondary_article_set.all(), [ "Parrot steals", "Parrot runs", ], lambda a: a.headline, )