131 lines
4.6 KiB
Python
131 lines
4.6 KiB
Python
from decimal import Decimal
|
|
|
|
from django.apps import apps
|
|
from django.core import checks
|
|
from django.db import models
|
|
from django.test import TestCase, skipIfDBFeature
|
|
from django.test.utils import isolate_apps
|
|
|
|
from .models import Bar, FkToChar, Foo, PrimaryKeyCharModel
|
|
|
|
|
|
class ForeignKeyTests(TestCase):
|
|
|
|
def test_callable_default(self):
|
|
"""A lazy callable may be used for ForeignKey.default."""
|
|
a = Foo.objects.create(id=1, a='abc', d=Decimal('12.34'))
|
|
b = Bar.objects.create(b='bcd')
|
|
self.assertEqual(b.a, a)
|
|
|
|
@skipIfDBFeature('interprets_empty_strings_as_nulls')
|
|
def test_empty_string_fk(self):
|
|
"""
|
|
Empty strings foreign key values don't get converted to None (#19299).
|
|
"""
|
|
char_model_empty = PrimaryKeyCharModel.objects.create(string='')
|
|
fk_model_empty = FkToChar.objects.create(out=char_model_empty)
|
|
fk_model_empty = FkToChar.objects.select_related('out').get(id=fk_model_empty.pk)
|
|
self.assertEqual(fk_model_empty.out, char_model_empty)
|
|
|
|
@isolate_apps('model_fields')
|
|
def test_warning_when_unique_true_on_fk(self):
|
|
class Foo(models.Model):
|
|
pass
|
|
|
|
class FKUniqueTrue(models.Model):
|
|
fk_field = models.ForeignKey(Foo, models.CASCADE, unique=True)
|
|
|
|
model = FKUniqueTrue()
|
|
expected_warnings = [
|
|
checks.Warning(
|
|
'Setting unique=True on a ForeignKey has the same effect as using a OneToOneField.',
|
|
hint='ForeignKey(unique=True) is usually better served by a OneToOneField.',
|
|
obj=FKUniqueTrue.fk_field.field,
|
|
id='fields.W342',
|
|
)
|
|
]
|
|
warnings = model.check()
|
|
self.assertEqual(warnings, expected_warnings)
|
|
|
|
def test_related_name_converted_to_text(self):
|
|
rel_name = Bar._meta.get_field('a').remote_field.related_name
|
|
self.assertIsInstance(rel_name, str)
|
|
|
|
def test_abstract_model_pending_operations(self):
|
|
"""
|
|
Foreign key fields declared on abstract models should not add lazy
|
|
relations to resolve relationship declared as string (#24215).
|
|
"""
|
|
pending_ops_before = list(apps._pending_operations.items())
|
|
|
|
class AbstractForeignKeyModel(models.Model):
|
|
fk = models.ForeignKey('missing.FK', models.CASCADE)
|
|
|
|
class Meta:
|
|
abstract = True
|
|
|
|
self.assertIs(AbstractForeignKeyModel._meta.apps, apps)
|
|
self.assertEqual(
|
|
pending_ops_before,
|
|
list(apps._pending_operations.items()),
|
|
'Pending lookup added for a foreign key on an abstract model'
|
|
)
|
|
|
|
@isolate_apps('model_fields', 'model_fields.tests')
|
|
def test_abstract_model_app_relative_foreign_key(self):
|
|
class AbstractReferent(models.Model):
|
|
reference = models.ForeignKey('Referred', on_delete=models.CASCADE)
|
|
|
|
class Meta:
|
|
app_label = 'model_fields'
|
|
abstract = True
|
|
|
|
def assert_app_model_resolved(label):
|
|
class Referred(models.Model):
|
|
class Meta:
|
|
app_label = label
|
|
|
|
class ConcreteReferent(AbstractReferent):
|
|
class Meta:
|
|
app_label = label
|
|
|
|
self.assertEqual(ConcreteReferent._meta.get_field('reference').related_model, Referred)
|
|
|
|
assert_app_model_resolved('model_fields')
|
|
assert_app_model_resolved('tests')
|
|
|
|
@isolate_apps('model_fields')
|
|
def test_to_python(self):
|
|
class Foo(models.Model):
|
|
pass
|
|
|
|
class Bar(models.Model):
|
|
fk = models.ForeignKey(Foo, models.CASCADE)
|
|
|
|
self.assertEqual(Bar._meta.get_field('fk').to_python('1'), 1)
|
|
|
|
@isolate_apps('model_fields')
|
|
def test_fk_to_fk_get_col_output_field(self):
|
|
class Foo(models.Model):
|
|
pass
|
|
|
|
class Bar(models.Model):
|
|
foo = models.ForeignKey(Foo, models.CASCADE, primary_key=True)
|
|
|
|
class Baz(models.Model):
|
|
bar = models.ForeignKey(Bar, models.CASCADE, primary_key=True)
|
|
|
|
col = Baz._meta.get_field('bar').get_col('alias')
|
|
self.assertIs(col.output_field, Foo._meta.pk)
|
|
|
|
@isolate_apps('model_fields')
|
|
def test_recursive_fks_get_col(self):
|
|
class Foo(models.Model):
|
|
bar = models.ForeignKey('Bar', models.CASCADE, primary_key=True)
|
|
|
|
class Bar(models.Model):
|
|
foo = models.ForeignKey(Foo, models.CASCADE, primary_key=True)
|
|
|
|
with self.assertRaisesMessage(ValueError, 'Cannot resolve output_field'):
|
|
Foo._meta.get_field('bar').get_col('alias')
|