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from __future__ import unicode_literals
import unittest
from django.core.exceptions import FieldError
from django.test import SimpleTestCase, TestCase
from .models import (
AdvancedUserStat, Child1, Child2, Child3, Child4, Image, Parent1, Parent2,
Product, StatDetails, User, UserProfile, UserStat, UserStatResult,
)
class ReverseSelectRelatedTestCase(TestCase):
def setUp(self):
user = User.objects.create(username="test")
UserProfile.objects.create(user=user, state="KS", city="Lawrence")
results = UserStatResult.objects.create(results='first results')
userstat = UserStat.objects.create(user=user, posts=150,
results=results)
StatDetails.objects.create(base_stats=userstat, comments=259)
user2 = User.objects.create(username="bob")
results2 = UserStatResult.objects.create(results='moar results')
advstat = AdvancedUserStat.objects.create(user=user2, posts=200, karma=5,
results=results2)
StatDetails.objects.create(base_stats=advstat, comments=250)
p1 = Parent1(name1="Only Parent1")
p1.save()
c1 = Child1(name1="Child1 Parent1", name2="Child1 Parent2", value=1)
c1.save()
p2 = Parent2(name2="Child2 Parent2")
p2.save()
c2 = Child2(name1="Child2 Parent1", parent2=p2, value=2)
c2.save()
def test_basic(self):
with self.assertNumQueries(1):
u = User.objects.select_related("userprofile").get(username="test")
self.assertEqual(u.userprofile.state, "KS")
def test_follow_next_level(self):
with self.assertNumQueries(1):
u = User.objects.select_related("userstat__results").get(username="test")
self.assertEqual(u.userstat.posts, 150)
self.assertEqual(u.userstat.results.results, 'first results')
def test_follow_two(self):
with self.assertNumQueries(1):
u = User.objects.select_related("userprofile", "userstat").get(username="test")
self.assertEqual(u.userprofile.state, "KS")
self.assertEqual(u.userstat.posts, 150)
def test_follow_two_next_level(self):
with self.assertNumQueries(1):
u = User.objects.select_related("userstat__results", "userstat__statdetails").get(username="test")
self.assertEqual(u.userstat.results.results, 'first results')
self.assertEqual(u.userstat.statdetails.comments, 259)
def test_forward_and_back(self):
with self.assertNumQueries(1):
stat = UserStat.objects.select_related("user__userprofile").get(user__username="test")
self.assertEqual(stat.user.userprofile.state, 'KS')
self.assertEqual(stat.user.userstat.posts, 150)
def test_back_and_forward(self):
with self.assertNumQueries(1):
u = User.objects.select_related("userstat").get(username="test")
self.assertEqual(u.userstat.user.username, 'test')
def test_not_followed_by_default(self):
with self.assertNumQueries(2):
u = User.objects.select_related().get(username="test")
self.assertEqual(u.userstat.posts, 150)
def test_follow_from_child_class(self):
with self.assertNumQueries(1):
stat = AdvancedUserStat.objects.select_related('user', 'statdetails').get(posts=200)
self.assertEqual(stat.statdetails.comments, 250)
self.assertEqual(stat.user.username, 'bob')
def test_follow_inheritance(self):
with self.assertNumQueries(1):
stat = UserStat.objects.select_related('user', 'advanceduserstat').get(posts=200)
self.assertEqual(stat.advanceduserstat.posts, 200)
self.assertEqual(stat.user.username, 'bob')
with self.assertNumQueries(1):
self.assertEqual(stat.advanceduserstat.user.username, 'bob')
def test_nullable_relation(self):
im = Image.objects.create(name="imag1")
p1 = Product.objects.create(name="Django Plushie", image=im)
p2 = Product.objects.create(name="Talking Django Plushie")
with self.assertNumQueries(1):
result = sorted(Product.objects.select_related("image"), key=lambda x: x.name)
self.assertEqual([p.name for p in result], ["Django Plushie", "Talking Django Plushie"])
self.assertEqual(p1.image, im)
# Check for ticket #13839
self.assertIsNone(p2.image)
def test_missing_reverse(self):
"""
Ticket #13839: select_related() should NOT cache None
for missing objects on a reverse 1-1 relation.
"""
with self.assertNumQueries(1):
user = User.objects.select_related('userprofile').get(username='bob')
with self.assertRaises(UserProfile.DoesNotExist):
user.userprofile
def test_nullable_missing_reverse(self):
"""
Ticket #13839: select_related() should NOT cache None
for missing objects on a reverse 0-1 relation.
"""
Image.objects.create(name="imag1")
with self.assertNumQueries(1):
image = Image.objects.select_related('product').get()
with self.assertRaises(Product.DoesNotExist):
image.product
def test_parent_only(self):
with self.assertNumQueries(1):
p = Parent1.objects.select_related('child1').get(name1="Only Parent1")
with self.assertNumQueries(0):
with self.assertRaises(Child1.DoesNotExist):
p.child1
def test_multiple_subclass(self):
with self.assertNumQueries(1):
p = Parent1.objects.select_related('child1').get(name1="Child1 Parent1")
self.assertEqual(p.child1.name2, 'Child1 Parent2')
def test_onetoone_with_subclass(self):
with self.assertNumQueries(1):
p = Parent2.objects.select_related('child2').get(name2="Child2 Parent2")
self.assertEqual(p.child2.name1, 'Child2 Parent1')
def test_onetoone_with_two_subclasses(self):
with self.assertNumQueries(1):
p = Parent2.objects.select_related('child2', "child2__child3").get(name2="Child2 Parent2")
self.assertEqual(p.child2.name1, 'Child2 Parent1')
with self.assertRaises(Child3.DoesNotExist):
p.child2.child3
p3 = Parent2(name2="Child3 Parent2")
p3.save()
c2 = Child3(name1="Child3 Parent1", parent2=p3, value=2, value3=3)
c2.save()
with self.assertNumQueries(1):
p = Parent2.objects.select_related('child2', "child2__child3").get(name2="Child3 Parent2")
self.assertEqual(p.child2.name1, 'Child3 Parent1')
self.assertEqual(p.child2.child3.value3, 3)
self.assertEqual(p.child2.child3.value, p.child2.value)
self.assertEqual(p.child2.name1, p.child2.child3.name1)
def test_multiinheritance_two_subclasses(self):
with self.assertNumQueries(1):
p = Parent1.objects.select_related('child1', 'child1__child4').get(name1="Child1 Parent1")
self.assertEqual(p.child1.name2, 'Child1 Parent2')
self.assertEqual(p.child1.name1, p.name1)
with self.assertRaises(Child4.DoesNotExist):
p.child1.child4
Child4(name1='n1', name2='n2', value=1, value4=4).save()
with self.assertNumQueries(1):
p = Parent2.objects.select_related('child1', 'child1__child4').get(name2="n2")
self.assertEqual(p.name2, 'n2')
self.assertEqual(p.child1.name1, 'n1')
self.assertEqual(p.child1.name2, p.name2)
self.assertEqual(p.child1.value, 1)
self.assertEqual(p.child1.child4.name1, p.child1.name1)
self.assertEqual(p.child1.child4.name2, p.child1.name2)
self.assertEqual(p.child1.child4.value, p.child1.value)
self.assertEqual(p.child1.child4.value4, 4)
@unittest.expectedFailure
def test_inheritance_deferred(self):
c = Child4.objects.create(name1='n1', name2='n2', value=1, value4=4)
with self.assertNumQueries(1):
p = Parent2.objects.select_related('child1').only(
'id2', 'child1__value').get(name2="n2")
self.assertEqual(p.id2, c.id2)
self.assertEqual(p.child1.value, 1)
p = Parent2.objects.select_related('child1').only(
'id2', 'child1__value').get(name2="n2")
with self.assertNumQueries(1):
self.assertEqual(p.name2, 'n2')
p = Parent2.objects.select_related('child1').only(
'id2', 'child1__value').get(name2="n2")
with self.assertNumQueries(1):
self.assertEqual(p.child1.name2, 'n2')
@unittest.expectedFailure
def test_inheritance_deferred2(self):
c = Child4.objects.create(name1='n1', name2='n2', value=1, value4=4)
qs = Parent2.objects.select_related('child1', 'child4').only(
'id2', 'child1__value', 'child1__child4__value4')
with self.assertNumQueries(1):
p = qs.get(name2="n2")
self.assertEqual(p.id2, c.id2)
self.assertEqual(p.child1.value, 1)
self.assertEqual(p.child1.child4.value4, 4)
self.assertEqual(p.child1.child4.id2, c.id2)
p = qs.get(name2="n2")
with self.assertNumQueries(1):
self.assertEqual(p.child1.name2, 'n2')
p = qs.get(name2="n2")
with self.assertNumQueries(1):
self.assertEqual(p.child1.name1, 'n1')
with self.assertNumQueries(1):
self.assertEqual(p.child1.child4.name1, 'n1')
class ReverseSelectRelatedValidationTests(SimpleTestCase):
"""
Rverse related fields should be listed in the validation message when an
invalid field is given in select_related().
"""
non_relational_error = "Non-relational field given in select_related: '%s'. Choices are: %s"
invalid_error = "Invalid field name(s) given in select_related: '%s'. Choices are: %s"
def test_reverse_related_validation(self):
fields = 'userprofile, userstat'
with self.assertRaisesMessage(FieldError, self.invalid_error % ('foobar', fields)):
list(User.objects.select_related('foobar'))
with self.assertRaisesMessage(FieldError, self.non_relational_error % ('username', fields)):
list(User.objects.select_related('username'))
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