|
| 1 | +from django.test import TestCase |
| 2 | + |
| 3 | +from models import Person, Book, Car, PersonManager, PublishedBookManager |
| 4 | + |
| 5 | + |
| 6 | +class CustomManagerTests(TestCase): |
| 7 | + def test_manager(self): |
| 8 | + p1 = Person.objects.create(first_name="Bugs", last_name="Bunny", fun=True) |
| 9 | + p2 = Person.objects.create(first_name="Droopy", last_name="Dog", fun=False) |
| 10 | + |
| 11 | + self.assertQuerysetEqual( |
| 12 | + Person.objects.get_fun_people(), [ |
| 13 | + "Bugs Bunny" |
| 14 | + ], |
| 15 | + unicode |
| 16 | + ) |
| 17 | + # The RelatedManager used on the 'books' descriptor extends the default |
| 18 | + # manager |
| 19 | + self.assertTrue(isinstance(p2.books, PublishedBookManager)) |
| 20 | + |
| 21 | + b1 = Book.published_objects.create( |
| 22 | + title="How to program", author="Rodney Dangerfield", is_published=True |
| 23 | + ) |
| 24 | + b2 = Book.published_objects.create( |
| 25 | + title="How to be smart", author="Albert Einstein", is_published=False |
| 26 | + ) |
| 27 | + |
| 28 | + # The default manager, "objects", doesn't exist, because a custom one |
| 29 | + # was provided. |
| 30 | + self.assertRaises(AttributeError, lambda: Book.objects) |
| 31 | + |
| 32 | + # The RelatedManager used on the 'authors' descriptor extends the |
| 33 | + # default manager |
| 34 | + self.assertTrue(isinstance(b2.authors, PersonManager)) |
| 35 | + |
| 36 | + self.assertQuerysetEqual( |
| 37 | + Book.published_objects.all(), [ |
| 38 | + "How to program", |
| 39 | + ], |
| 40 | + lambda b: b.title |
| 41 | + ) |
| 42 | + |
| 43 | + c1 = Car.cars.create(name="Corvette", mileage=21, top_speed=180) |
| 44 | + c2 = Car.cars.create(name="Neon", mileage=31, top_speed=100) |
| 45 | + |
| 46 | + self.assertQuerysetEqual( |
| 47 | + Car.cars.order_by("name"), [ |
| 48 | + "Corvette", |
| 49 | + "Neon", |
| 50 | + ], |
| 51 | + lambda c: c.name |
| 52 | + ) |
| 53 | + |
| 54 | + self.assertQuerysetEqual( |
| 55 | + Car.fast_cars.all(), [ |
| 56 | + "Corvette", |
| 57 | + ], |
| 58 | + lambda c: c.name |
| 59 | + ) |
| 60 | + |
| 61 | + # Each model class gets a "_default_manager" attribute, which is a |
| 62 | + # reference to the first manager defined in the class. In this case, |
| 63 | + # it's "cars". |
| 64 | + |
| 65 | + self.assertQuerysetEqual( |
| 66 | + Car._default_manager.order_by("name"), [ |
| 67 | + "Corvette", |
| 68 | + "Neon", |
| 69 | + ], |
| 70 | + lambda c: c.name |
| 71 | + ) |
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