621 lines
27 KiB
Python
621 lines
27 KiB
Python
from __future__ import absolute_import, unicode_literals
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from django.contrib.contenttypes.models import ContentType
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from django.db import connection
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from django.test import TestCase
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from django.test.utils import override_settings
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from django.utils import six
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from .models import (Author, Book, Reader, Qualification, Teacher, Department,
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TaggedItem, Bookmark, AuthorAddress, FavoriteAuthors, AuthorWithAge,
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BookWithYear, BookReview, Person, House, Room, Employee, Comment)
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class PrefetchRelatedTests(TestCase):
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def setUp(self):
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self.book1 = Book.objects.create(title="Poems")
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self.book2 = Book.objects.create(title="Jane Eyre")
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self.book3 = Book.objects.create(title="Wuthering Heights")
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self.book4 = Book.objects.create(title="Sense and Sensibility")
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self.author1 = Author.objects.create(name="Charlotte",
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first_book=self.book1)
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self.author2 = Author.objects.create(name="Anne",
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first_book=self.book1)
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self.author3 = Author.objects.create(name="Emily",
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first_book=self.book1)
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self.author4 = Author.objects.create(name="Jane",
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first_book=self.book4)
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self.book1.authors.add(self.author1, self.author2, self.author3)
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self.book2.authors.add(self.author1)
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self.book3.authors.add(self.author3)
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self.book4.authors.add(self.author4)
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self.reader1 = Reader.objects.create(name="Amy")
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self.reader2 = Reader.objects.create(name="Belinda")
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self.reader1.books_read.add(self.book1, self.book4)
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self.reader2.books_read.add(self.book2, self.book4)
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def test_m2m_forward(self):
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with self.assertNumQueries(2):
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lists = [list(b.authors.all()) for b in Book.objects.prefetch_related('authors')]
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normal_lists = [list(b.authors.all()) for b in Book.objects.all()]
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self.assertEqual(lists, normal_lists)
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def test_m2m_reverse(self):
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with self.assertNumQueries(2):
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lists = [list(a.books.all()) for a in Author.objects.prefetch_related('books')]
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normal_lists = [list(a.books.all()) for a in Author.objects.all()]
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self.assertEqual(lists, normal_lists)
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def test_foreignkey_forward(self):
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with self.assertNumQueries(2):
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books = [a.first_book for a in Author.objects.prefetch_related('first_book')]
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normal_books = [a.first_book for a in Author.objects.all()]
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self.assertEqual(books, normal_books)
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def test_foreignkey_reverse(self):
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with self.assertNumQueries(2):
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lists = [list(b.first_time_authors.all())
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for b in Book.objects.prefetch_related('first_time_authors')]
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self.assertQuerysetEqual(self.book2.authors.all(), ["<Author: Charlotte>"])
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def test_onetoone_reverse_no_match(self):
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# Regression for #17439
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with self.assertNumQueries(2):
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book = Book.objects.prefetch_related('bookwithyear').all()[0]
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with self.assertNumQueries(0):
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with self.assertRaises(BookWithYear.DoesNotExist):
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book.bookwithyear
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def test_survives_clone(self):
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with self.assertNumQueries(2):
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lists = [list(b.first_time_authors.all())
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for b in Book.objects.prefetch_related('first_time_authors').exclude(id=1000)]
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def test_len(self):
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with self.assertNumQueries(2):
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qs = Book.objects.prefetch_related('first_time_authors')
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length = len(qs)
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lists = [list(b.first_time_authors.all())
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for b in qs]
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def test_bool(self):
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with self.assertNumQueries(2):
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qs = Book.objects.prefetch_related('first_time_authors')
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x = bool(qs)
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lists = [list(b.first_time_authors.all())
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for b in qs]
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def test_count(self):
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with self.assertNumQueries(2):
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qs = Book.objects.prefetch_related('first_time_authors')
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[b.first_time_authors.count() for b in qs]
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def test_exists(self):
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with self.assertNumQueries(2):
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qs = Book.objects.prefetch_related('first_time_authors')
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[b.first_time_authors.exists() for b in qs]
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def test_clear(self):
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"""
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Test that we can clear the behavior by calling prefetch_related()
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"""
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with self.assertNumQueries(5):
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with_prefetch = Author.objects.prefetch_related('books')
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without_prefetch = with_prefetch.prefetch_related(None)
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lists = [list(a.books.all()) for a in without_prefetch]
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def test_m2m_then_m2m(self):
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"""
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Test we can follow a m2m and another m2m
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"""
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with self.assertNumQueries(3):
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qs = Author.objects.prefetch_related('books__read_by')
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lists = [[[six.text_type(r) for r in b.read_by.all()]
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for b in a.books.all()]
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for a in qs]
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self.assertEqual(lists,
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[
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[["Amy"], ["Belinda"]], # Charlotte - Poems, Jane Eyre
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[["Amy"]], # Anne - Poems
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[["Amy"], []], # Emily - Poems, Wuthering Heights
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[["Amy", "Belinda"]], # Jane - Sense and Sense
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])
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def test_overriding_prefetch(self):
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with self.assertNumQueries(3):
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qs = Author.objects.prefetch_related('books', 'books__read_by')
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lists = [[[six.text_type(r) for r in b.read_by.all()]
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for b in a.books.all()]
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for a in qs]
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self.assertEqual(lists,
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[
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[["Amy"], ["Belinda"]], # Charlotte - Poems, Jane Eyre
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[["Amy"]], # Anne - Poems
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[["Amy"], []], # Emily - Poems, Wuthering Heights
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[["Amy", "Belinda"]], # Jane - Sense and Sense
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])
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with self.assertNumQueries(3):
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qs = Author.objects.prefetch_related('books__read_by', 'books')
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lists = [[[six.text_type(r) for r in b.read_by.all()]
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for b in a.books.all()]
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for a in qs]
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self.assertEqual(lists,
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[
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[["Amy"], ["Belinda"]], # Charlotte - Poems, Jane Eyre
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[["Amy"]], # Anne - Poems
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[["Amy"], []], # Emily - Poems, Wuthering Heights
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[["Amy", "Belinda"]], # Jane - Sense and Sense
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])
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def test_get(self):
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"""
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Test that objects retrieved with .get() get the prefetch behavior.
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"""
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# Need a double
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with self.assertNumQueries(3):
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author = Author.objects.prefetch_related('books__read_by').get(name="Charlotte")
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lists = [[six.text_type(r) for r in b.read_by.all()]
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for b in author.books.all()]
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self.assertEqual(lists, [["Amy"], ["Belinda"]]) # Poems, Jane Eyre
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def test_foreign_key_then_m2m(self):
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"""
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Test we can follow an m2m relation after a relation like ForeignKey
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that doesn't have many objects
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"""
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with self.assertNumQueries(2):
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qs = Author.objects.select_related('first_book').prefetch_related('first_book__read_by')
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lists = [[six.text_type(r) for r in a.first_book.read_by.all()]
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for a in qs]
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self.assertEqual(lists, [["Amy"],
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["Amy"],
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["Amy"],
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["Amy", "Belinda"]])
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def test_attribute_error(self):
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qs = Reader.objects.all().prefetch_related('books_read__xyz')
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with self.assertRaises(AttributeError) as cm:
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list(qs)
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self.assertTrue('prefetch_related' in str(cm.exception))
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def test_invalid_final_lookup(self):
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qs = Book.objects.prefetch_related('authors__name')
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with self.assertRaises(ValueError) as cm:
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list(qs)
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self.assertTrue('prefetch_related' in str(cm.exception))
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self.assertTrue("name" in str(cm.exception))
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class DefaultManagerTests(TestCase):
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def setUp(self):
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self.qual1 = Qualification.objects.create(name="BA")
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self.qual2 = Qualification.objects.create(name="BSci")
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self.qual3 = Qualification.objects.create(name="MA")
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self.qual4 = Qualification.objects.create(name="PhD")
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self.teacher1 = Teacher.objects.create(name="Mr Cleese")
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self.teacher2 = Teacher.objects.create(name="Mr Idle")
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self.teacher3 = Teacher.objects.create(name="Mr Chapman")
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self.teacher1.qualifications.add(self.qual1, self.qual2, self.qual3, self.qual4)
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self.teacher2.qualifications.add(self.qual1)
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self.teacher3.qualifications.add(self.qual2)
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self.dept1 = Department.objects.create(name="English")
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self.dept2 = Department.objects.create(name="Physics")
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self.dept1.teachers.add(self.teacher1, self.teacher2)
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self.dept2.teachers.add(self.teacher1, self.teacher3)
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def test_m2m_then_m2m(self):
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with self.assertNumQueries(3):
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# When we prefetch the teachers, and force the query, we don't want
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# the default manager on teachers to immediately get all the related
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# qualifications, since this will do one query per teacher.
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qs = Department.objects.prefetch_related('teachers')
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depts = "".join(["%s department: %s\n" %
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(dept.name, ", ".join(six.text_type(t) for t in dept.teachers.all()))
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for dept in qs])
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self.assertEqual(depts,
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"English department: Mr Cleese (BA, BSci, MA, PhD), Mr Idle (BA)\n"
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"Physics department: Mr Cleese (BA, BSci, MA, PhD), Mr Chapman (BSci)\n")
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class GenericRelationTests(TestCase):
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def setUp(self):
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book1 = Book.objects.create(title="Winnie the Pooh")
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book2 = Book.objects.create(title="Do you like green eggs and spam?")
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book3 = Book.objects.create(title="Three Men In A Boat")
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reader1 = Reader.objects.create(name="me")
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reader2 = Reader.objects.create(name="you")
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reader3 = Reader.objects.create(name="someone")
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book1.read_by.add(reader1, reader2)
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book2.read_by.add(reader2)
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book3.read_by.add(reader3)
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self.book1, self.book2, self.book3 = book1, book2, book3
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self.reader1, self.reader2, self.reader3 = reader1, reader2, reader3
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def test_prefetch_GFK(self):
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TaggedItem.objects.create(tag="awesome", content_object=self.book1)
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TaggedItem.objects.create(tag="great", content_object=self.reader1)
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TaggedItem.objects.create(tag="stupid", content_object=self.book2)
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TaggedItem.objects.create(tag="amazing", content_object=self.reader3)
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# 1 for TaggedItem table, 1 for Book table, 1 for Reader table
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with self.assertNumQueries(3):
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qs = TaggedItem.objects.prefetch_related('content_object')
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list(qs)
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def test_prefetch_GFK_nonint_pk(self):
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Comment.objects.create(comment="awesome", content_object=self.book1)
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# 1 for Comment table, 1 for Book table
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with self.assertNumQueries(2):
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qs = Comment.objects.prefetch_related('content_object')
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[c.content_object for c in qs]
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def test_traverse_GFK(self):
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"""
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Test that we can traverse a 'content_object' with prefetch_related() and
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get to related objects on the other side (assuming it is suitably
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filtered)
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"""
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TaggedItem.objects.create(tag="awesome", content_object=self.book1)
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TaggedItem.objects.create(tag="awesome", content_object=self.book2)
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TaggedItem.objects.create(tag="awesome", content_object=self.book3)
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TaggedItem.objects.create(tag="awesome", content_object=self.reader1)
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TaggedItem.objects.create(tag="awesome", content_object=self.reader2)
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ct = ContentType.objects.get_for_model(Book)
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# We get 3 queries - 1 for main query, 1 for content_objects since they
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# all use the same table, and 1 for the 'read_by' relation.
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with self.assertNumQueries(3):
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# If we limit to books, we know that they will have 'read_by'
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# attributes, so the following makes sense:
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qs = TaggedItem.objects.filter(content_type=ct, tag='awesome').prefetch_related('content_object__read_by')
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readers_of_awesome_books = set([r.name for tag in qs
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for r in tag.content_object.read_by.all()])
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self.assertEqual(readers_of_awesome_books, set(["me", "you", "someone"]))
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def test_nullable_GFK(self):
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TaggedItem.objects.create(tag="awesome", content_object=self.book1,
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created_by=self.reader1)
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TaggedItem.objects.create(tag="great", content_object=self.book2)
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TaggedItem.objects.create(tag="rubbish", content_object=self.book3)
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with self.assertNumQueries(2):
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result = [t.created_by for t in TaggedItem.objects.prefetch_related('created_by')]
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self.assertEqual(result,
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[t.created_by for t in TaggedItem.objects.all()])
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def test_generic_relation(self):
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b = Bookmark.objects.create(url='http://www.djangoproject.com/')
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t1 = TaggedItem.objects.create(content_object=b, tag='django')
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t2 = TaggedItem.objects.create(content_object=b, tag='python')
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with self.assertNumQueries(2):
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tags = [t.tag for b in Bookmark.objects.prefetch_related('tags')
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for t in b.tags.all()]
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self.assertEqual(sorted(tags), ["django", "python"])
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def test_charfield_GFK(self):
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b = Bookmark.objects.create(url='http://www.djangoproject.com/')
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t1 = TaggedItem.objects.create(content_object=b, tag='django')
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t2 = TaggedItem.objects.create(content_object=b, favorite=b, tag='python')
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with self.assertNumQueries(3):
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bookmark = Bookmark.objects.filter(pk=b.pk).prefetch_related('tags', 'favorite_tags')[0]
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self.assertEqual(sorted([i.tag for i in bookmark.tags.all()]), ["django", "python"])
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self.assertEqual([i.tag for i in bookmark.favorite_tags.all()], ["python"])
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class MultiTableInheritanceTest(TestCase):
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def setUp(self):
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self.book1 = BookWithYear.objects.create(
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title="Poems", published_year=2010)
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self.book2 = BookWithYear.objects.create(
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title="More poems", published_year=2011)
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self.author1 = AuthorWithAge.objects.create(
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name='Jane', first_book=self.book1, age=50)
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self.author2 = AuthorWithAge.objects.create(
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name='Tom', first_book=self.book1, age=49)
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self.author3 = AuthorWithAge.objects.create(
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name='Robert', first_book=self.book2, age=48)
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self.authorAddress = AuthorAddress.objects.create(
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author=self.author1, address='SomeStreet 1')
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self.book2.aged_authors.add(self.author2, self.author3)
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self.br1 = BookReview.objects.create(
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book=self.book1, notes="review book1")
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self.br2 = BookReview.objects.create(
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book=self.book2, notes="review book2")
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def test_foreignkey(self):
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with self.assertNumQueries(2):
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qs = AuthorWithAge.objects.prefetch_related('addresses')
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addresses = [[six.text_type(address) for address in obj.addresses.all()]
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for obj in qs]
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self.assertEqual(addresses, [[six.text_type(self.authorAddress)], [], []])
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def test_foreignkey_to_inherited(self):
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with self.assertNumQueries(2):
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qs = BookReview.objects.prefetch_related('book')
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titles = [obj.book.title for obj in qs]
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self.assertEqual(titles, ["Poems", "More poems"])
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def test_m2m_to_inheriting_model(self):
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qs = AuthorWithAge.objects.prefetch_related('books_with_year')
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with self.assertNumQueries(2):
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lst = [[six.text_type(book) for book in author.books_with_year.all()]
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for author in qs]
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qs = AuthorWithAge.objects.all()
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lst2 = [[six.text_type(book) for book in author.books_with_year.all()]
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for author in qs]
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self.assertEqual(lst, lst2)
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qs = BookWithYear.objects.prefetch_related('aged_authors')
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with self.assertNumQueries(2):
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lst = [[six.text_type(author) for author in book.aged_authors.all()]
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for book in qs]
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qs = BookWithYear.objects.all()
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lst2 = [[six.text_type(author) for author in book.aged_authors.all()]
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for book in qs]
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self.assertEqual(lst, lst2)
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def test_parent_link_prefetch(self):
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with self.assertNumQueries(2):
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[a.author for a in AuthorWithAge.objects.prefetch_related('author')]
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@override_settings(DEBUG=True)
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def test_child_link_prefetch(self):
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with self.assertNumQueries(2):
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l = [a.authorwithage for a in Author.objects.prefetch_related('authorwithage')]
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# Regression for #18090: the prefetching query must include an IN clause.
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# Note that on Oracle the table name is upper case in the generated SQL,
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# thus the .lower() call.
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self.assertIn('authorwithage', connection.queries[-1]['sql'].lower())
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self.assertIn(' IN ', connection.queries[-1]['sql'])
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self.assertEqual(l, [a.authorwithage for a in Author.objects.all()])
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class ForeignKeyToFieldTest(TestCase):
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def setUp(self):
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self.book = Book.objects.create(title="Poems")
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self.author1 = Author.objects.create(name='Jane', first_book=self.book)
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self.author2 = Author.objects.create(name='Tom', first_book=self.book)
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self.author3 = Author.objects.create(name='Robert', first_book=self.book)
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self.authorAddress = AuthorAddress.objects.create(
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author=self.author1, address='SomeStreet 1'
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)
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FavoriteAuthors.objects.create(author=self.author1,
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likes_author=self.author2)
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FavoriteAuthors.objects.create(author=self.author2,
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likes_author=self.author3)
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FavoriteAuthors.objects.create(author=self.author3,
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likes_author=self.author1)
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def test_foreignkey(self):
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with self.assertNumQueries(2):
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qs = Author.objects.prefetch_related('addresses')
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addresses = [[six.text_type(address) for address in obj.addresses.all()]
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for obj in qs]
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self.assertEqual(addresses, [[six.text_type(self.authorAddress)], [], []])
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def test_m2m(self):
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with self.assertNumQueries(3):
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qs = Author.objects.all().prefetch_related('favorite_authors', 'favors_me')
|
|
favorites = [(
|
|
[six.text_type(i_like) for i_like in author.favorite_authors.all()],
|
|
[six.text_type(likes_me) for likes_me in author.favors_me.all()]
|
|
) for author in qs]
|
|
self.assertEqual(
|
|
favorites,
|
|
[
|
|
([six.text_type(self.author2)],[six.text_type(self.author3)]),
|
|
([six.text_type(self.author3)],[six.text_type(self.author1)]),
|
|
([six.text_type(self.author1)],[six.text_type(self.author2)])
|
|
]
|
|
)
|
|
|
|
|
|
class LookupOrderingTest(TestCase):
|
|
"""
|
|
Test cases that demonstrate that ordering of lookups is important, and
|
|
ensure it is preserved.
|
|
"""
|
|
|
|
def setUp(self):
|
|
self.person1 = Person.objects.create(name="Joe")
|
|
self.person2 = Person.objects.create(name="Mary")
|
|
|
|
self.house1 = House.objects.create(address="123 Main St")
|
|
self.house2 = House.objects.create(address="45 Side St")
|
|
self.house3 = House.objects.create(address="6 Downing St")
|
|
self.house4 = House.objects.create(address="7 Regents St")
|
|
|
|
self.room1_1 = Room.objects.create(name="Dining room", house=self.house1)
|
|
self.room1_2 = Room.objects.create(name="Lounge", house=self.house1)
|
|
self.room1_3 = Room.objects.create(name="Kitchen", house=self.house1)
|
|
|
|
self.room2_1 = Room.objects.create(name="Dining room", house=self.house2)
|
|
self.room2_2 = Room.objects.create(name="Lounge", house=self.house2)
|
|
|
|
self.room3_1 = Room.objects.create(name="Dining room", house=self.house3)
|
|
self.room3_2 = Room.objects.create(name="Lounge", house=self.house3)
|
|
self.room3_3 = Room.objects.create(name="Kitchen", house=self.house3)
|
|
|
|
self.room4_1 = Room.objects.create(name="Dining room", house=self.house4)
|
|
self.room4_2 = Room.objects.create(name="Lounge", house=self.house4)
|
|
|
|
self.person1.houses.add(self.house1, self.house2)
|
|
self.person2.houses.add(self.house3, self.house4)
|
|
|
|
def test_order(self):
|
|
with self.assertNumQueries(4):
|
|
# The following two queries must be done in the same order as written,
|
|
# otherwise 'primary_house' will cause non-prefetched lookups
|
|
qs = Person.objects.prefetch_related('houses__rooms',
|
|
'primary_house__occupants')
|
|
[list(p.primary_house.occupants.all()) for p in qs]
|
|
|
|
|
|
class NullableTest(TestCase):
|
|
|
|
def setUp(self):
|
|
boss = Employee.objects.create(name="Peter")
|
|
worker1 = Employee.objects.create(name="Joe", boss=boss)
|
|
worker2 = Employee.objects.create(name="Angela", boss=boss)
|
|
|
|
def test_traverse_nullable(self):
|
|
# Because we use select_related() for 'boss', it doesn't need to be
|
|
# prefetched, but we can still traverse it although it contains some nulls
|
|
with self.assertNumQueries(2):
|
|
qs = Employee.objects.select_related('boss').prefetch_related('boss__serfs')
|
|
co_serfs = [list(e.boss.serfs.all()) if e.boss is not None else []
|
|
for e in qs]
|
|
|
|
qs2 = Employee.objects.select_related('boss')
|
|
co_serfs2 = [list(e.boss.serfs.all()) if e.boss is not None else []
|
|
for e in qs2]
|
|
|
|
self.assertEqual(co_serfs, co_serfs2)
|
|
|
|
def test_prefetch_nullable(self):
|
|
# One for main employee, one for boss, one for serfs
|
|
with self.assertNumQueries(3):
|
|
qs = Employee.objects.prefetch_related('boss__serfs')
|
|
co_serfs = [list(e.boss.serfs.all()) if e.boss is not None else []
|
|
for e in qs]
|
|
|
|
qs2 = Employee.objects.all()
|
|
co_serfs2 = [list(e.boss.serfs.all()) if e.boss is not None else []
|
|
for e in qs2]
|
|
|
|
self.assertEqual(co_serfs, co_serfs2)
|
|
|
|
def test_in_bulk(self):
|
|
"""
|
|
In-bulk does correctly prefetch objects by not using .iterator()
|
|
directly.
|
|
"""
|
|
boss1 = Employee.objects.create(name="Peter")
|
|
boss2 = Employee.objects.create(name="Jack")
|
|
with self.assertNumQueries(2):
|
|
# Check that prefetch is done and it does not cause any errors.
|
|
bulk = Employee.objects.prefetch_related('serfs').in_bulk([boss1.pk, boss2.pk])
|
|
for b in bulk.values():
|
|
list(b.serfs.all())
|
|
|
|
|
|
class MultiDbTests(TestCase):
|
|
multi_db = True
|
|
|
|
def test_using_is_honored_m2m(self):
|
|
B = Book.objects.using('other')
|
|
A = Author.objects.using('other')
|
|
book1 = B.create(title="Poems")
|
|
book2 = B.create(title="Jane Eyre")
|
|
book3 = B.create(title="Wuthering Heights")
|
|
book4 = B.create(title="Sense and Sensibility")
|
|
|
|
author1 = A.create(name="Charlotte", first_book=book1)
|
|
author2 = A.create(name="Anne", first_book=book1)
|
|
author3 = A.create(name="Emily", first_book=book1)
|
|
author4 = A.create(name="Jane", first_book=book4)
|
|
|
|
book1.authors.add(author1, author2, author3)
|
|
book2.authors.add(author1)
|
|
book3.authors.add(author3)
|
|
book4.authors.add(author4)
|
|
|
|
# Forward
|
|
qs1 = B.prefetch_related('authors')
|
|
with self.assertNumQueries(2, using='other'):
|
|
books = "".join(["%s (%s)\n" %
|
|
(book.title, ", ".join(a.name for a in book.authors.all()))
|
|
for book in qs1])
|
|
self.assertEqual(books,
|
|
"Poems (Charlotte, Anne, Emily)\n"
|
|
"Jane Eyre (Charlotte)\n"
|
|
"Wuthering Heights (Emily)\n"
|
|
"Sense and Sensibility (Jane)\n")
|
|
|
|
# Reverse
|
|
qs2 = A.prefetch_related('books')
|
|
with self.assertNumQueries(2, using='other'):
|
|
authors = "".join(["%s: %s\n" %
|
|
(author.name, ", ".join(b.title for b in author.books.all()))
|
|
for author in qs2])
|
|
self.assertEqual(authors,
|
|
"Charlotte: Poems, Jane Eyre\n"
|
|
"Anne: Poems\n"
|
|
"Emily: Poems, Wuthering Heights\n"
|
|
"Jane: Sense and Sensibility\n")
|
|
|
|
def test_using_is_honored_fkey(self):
|
|
B = Book.objects.using('other')
|
|
A = Author.objects.using('other')
|
|
book1 = B.create(title="Poems")
|
|
book2 = B.create(title="Sense and Sensibility")
|
|
|
|
author1 = A.create(name="Charlotte Bronte", first_book=book1)
|
|
author2 = A.create(name="Jane Austen", first_book=book2)
|
|
|
|
# Forward
|
|
with self.assertNumQueries(2, using='other'):
|
|
books = ", ".join(a.first_book.title for a in A.prefetch_related('first_book'))
|
|
self.assertEqual("Poems, Sense and Sensibility", books)
|
|
|
|
# Reverse
|
|
with self.assertNumQueries(2, using='other'):
|
|
books = "".join("%s (%s)\n" %
|
|
(b.title, ", ".join(a.name for a in b.first_time_authors.all()))
|
|
for b in B.prefetch_related('first_time_authors'))
|
|
self.assertEqual(books,
|
|
"Poems (Charlotte Bronte)\n"
|
|
"Sense and Sensibility (Jane Austen)\n")
|
|
|
|
def test_using_is_honored_inheritance(self):
|
|
B = BookWithYear.objects.using('other')
|
|
A = AuthorWithAge.objects.using('other')
|
|
book1 = B.create(title="Poems", published_year=2010)
|
|
book2 = B.create(title="More poems", published_year=2011)
|
|
author1 = A.create(name='Jane', first_book=book1, age=50)
|
|
author2 = A.create(name='Tom', first_book=book1, age=49)
|
|
|
|
# parent link
|
|
with self.assertNumQueries(2, using='other'):
|
|
authors = ", ".join(a.author.name for a in A.prefetch_related('author'))
|
|
|
|
self.assertEqual(authors, "Jane, Tom")
|
|
|
|
# child link
|
|
with self.assertNumQueries(2, using='other'):
|
|
ages = ", ".join(str(a.authorwithage.age) for a in A.prefetch_related('authorwithage'))
|
|
|
|
self.assertEqual(ages, "50, 49")
|