# -*- encoding: utf-8 -*-
from __future__ import unicode_literals
from django.core.checks import Error, Warning as DjangoWarning
from django.db import models
from django.test.utils import override_settings
from django.test.testcases import skipIfDBFeature
from .base import IsolatedModelsTestCase
class RelativeFieldTests(IsolatedModelsTestCase):
def test_valid_foreign_key_without_accessor(self):
class Target(models.Model):
# There would be a clash if Model.field installed an accessor.
model = models.IntegerField()
class Model(models.Model):
field = models.ForeignKey(Target, related_name='+')
field = Model._meta.get_field('field')
errors = field.check()
self.assertEqual(errors, [])
def test_foreign_key_to_missing_model(self):
# Model names are resolved when a model is being created, so we cannot
# test relative fields in isolation and we need to attach them to a
# model.
class Model(models.Model):
foreign_key = models.ForeignKey('Rel1')
field = Model._meta.get_field('foreign_key')
errors = field.check()
expected = [
Error(
("Field defines a relation with model 'Rel1', "
"which is either not installed, or is abstract."),
hint=None,
obj=field,
id='fields.E300',
),
]
self.assertEqual(errors, expected)
def test_many_to_many_to_missing_model(self):
class Model(models.Model):
m2m = models.ManyToManyField("Rel2")
field = Model._meta.get_field('m2m')
errors = field.check(from_model=Model)
expected = [
Error(
("Field defines a relation with model 'Rel2', "
"which is either not installed, or is abstract."),
hint=None,
obj=field,
id='fields.E300',
),
]
self.assertEqual(errors, expected)
def test_many_to_many_with_useless_options(self):
class Model(models.Model):
name = models.CharField(max_length=20)
class ModelM2M(models.Model):
m2m = models.ManyToManyField(Model, null=True, validators=[''])
errors = ModelM2M.check()
field = ModelM2M._meta.get_field('m2m')
expected = [
DjangoWarning(
'null has no effect on ManyToManyField.',
hint=None,
obj=field,
id='fields.W340',
)
]
expected.append(
DjangoWarning(
'ManyToManyField does not support validators.',
hint=None,
obj=field,
id='fields.W341',
)
)
self.assertEqual(errors, expected)
def test_ambiguous_relationship_model(self):
class Person(models.Model):
pass
class Group(models.Model):
field = models.ManyToManyField('Person',
through="AmbiguousRelationship", related_name='tertiary')
class AmbiguousRelationship(models.Model):
# Too much foreign keys to Person.
first_person = models.ForeignKey(Person, related_name="first")
second_person = models.ForeignKey(Person, related_name="second")
second_model = models.ForeignKey(Group)
field = Group._meta.get_field('field')
errors = field.check(from_model=Group)
expected = [
Error(
("The model is used as an intermediate model by "
"'invalid_models_tests.Group.field', but it has more than one "
"foreign key to 'Person', which is ambiguous. You must specify "
"which foreign key Django should use via the through_fields "
"keyword argument."),
hint=('If you want to create a recursive relationship, use '
'ForeignKey("self", symmetrical=False, '
'through="AmbiguousRelationship").'),
obj=field,
id='fields.E335',
),
]
self.assertEqual(errors, expected)
def test_relationship_model_with_foreign_key_to_wrong_model(self):
class WrongModel(models.Model):
pass
class Person(models.Model):
pass
class Group(models.Model):
members = models.ManyToManyField('Person',
through="InvalidRelationship")
class InvalidRelationship(models.Model):
person = models.ForeignKey(Person)
wrong_foreign_key = models.ForeignKey(WrongModel)
# The last foreign key should point to Group model.
field = Group._meta.get_field('members')
errors = field.check(from_model=Group)
expected = [
Error(
("The model is used as an intermediate model by "
"'invalid_models_tests.Group.members', but it does not "
"have a foreign key to 'Group' or 'Person'."),
hint=None,
obj=InvalidRelationship,
id='fields.E336',
),
]
self.assertEqual(errors, expected)
def test_relationship_model_missing_foreign_key(self):
class Person(models.Model):
pass
class Group(models.Model):
members = models.ManyToManyField('Person',
through="InvalidRelationship")
class InvalidRelationship(models.Model):
group = models.ForeignKey(Group)
# No foreign key to Person
field = Group._meta.get_field('members')
errors = field.check(from_model=Group)
expected = [
Error(
("The model is used as an intermediate model by "
"'invalid_models_tests.Group.members', but it does not have "
"a foreign key to 'Group' or 'Person'."),
hint=None,
obj=InvalidRelationship,
id='fields.E336',
),
]
self.assertEqual(errors, expected)
def test_missing_relationship_model(self):
class Person(models.Model):
pass
class Group(models.Model):
members = models.ManyToManyField('Person',
through="MissingM2MModel")
field = Group._meta.get_field('members')
errors = field.check(from_model=Group)
expected = [
Error(
("Field specifies a many-to-many relation through model "
"'MissingM2MModel', which has not been installed."),
hint=None,
obj=field,
id='fields.E331',
),
]
self.assertEqual(errors, expected)
def test_symmetrical_self_referential_field(self):
class Person(models.Model):
# Implicit symmetrical=False.
friends = models.ManyToManyField('self', through="Relationship")
class Relationship(models.Model):
first = models.ForeignKey(Person, related_name="rel_from_set")
second = models.ForeignKey(Person, related_name="rel_to_set")
field = Person._meta.get_field('friends')
errors = field.check(from_model=Person)
expected = [
Error(
'Many-to-many fields with intermediate tables must not be symmetrical.',
hint=None,
obj=field,
id='fields.E332',
),
]
self.assertEqual(errors, expected)
def test_too_many_foreign_keys_in_self_referential_model(self):
class Person(models.Model):
friends = models.ManyToManyField('self',
through="InvalidRelationship", symmetrical=False)
class InvalidRelationship(models.Model):
first = models.ForeignKey(Person, related_name="rel_from_set_2")
second = models.ForeignKey(Person, related_name="rel_to_set_2")
third = models.ForeignKey(Person, related_name="too_many_by_far")
field = Person._meta.get_field('friends')
errors = field.check(from_model=Person)
expected = [
Error(
("The model is used as an intermediate model by "
"'invalid_models_tests.Person.friends', but it has more than two "
"foreign keys to 'Person', which is ambiguous. You must specify "
"which two foreign keys Django should use via the through_fields "
"keyword argument."),
hint='Use through_fields to specify which two foreign keys Django should use.',
obj=InvalidRelationship,
id='fields.E333',
),
]
self.assertEqual(errors, expected)
def test_symmetric_self_reference_with_intermediate_table(self):
class Person(models.Model):
# Explicit symmetrical=True.
friends = models.ManyToManyField('self',
through="Relationship", symmetrical=True)
class Relationship(models.Model):
first = models.ForeignKey(Person, related_name="rel_from_set")
second = models.ForeignKey(Person, related_name="rel_to_set")
field = Person._meta.get_field('friends')
errors = field.check(from_model=Person)
expected = [
Error(
'Many-to-many fields with intermediate tables must not be symmetrical.',
hint=None,
obj=field,
id='fields.E332',
),
]
self.assertEqual(errors, expected)
def test_symmetric_self_reference_with_intermediate_table_and_through_fields(self):
"""Using through_fields in a m2m with an intermediate model shouldn't mask its incompatibility with symmetry."""
class Person(models.Model):
# Explicit symmetrical=True.
friends = models.ManyToManyField('self',
symmetrical=True,
through="Relationship",
through_fields=('first', 'second'))
class Relationship(models.Model):
first = models.ForeignKey(Person, related_name="rel_from_set")
second = models.ForeignKey(Person, related_name="rel_to_set")
referee = models.ForeignKey(Person, related_name="referred")
field = Person._meta.get_field('friends')
errors = field.check(from_model=Person)
expected = [
Error(
'Many-to-many fields with intermediate tables must not be symmetrical.',
hint=None,
obj=field,
id='fields.E332',
),
]
self.assertEqual(errors, expected)
def test_foreign_key_to_abstract_model(self):
class Model(models.Model):
foreign_key = models.ForeignKey('AbstractModel')
class AbstractModel(models.Model):
class Meta:
abstract = True
field = Model._meta.get_field('foreign_key')
errors = field.check()
expected = [
Error(
("Field defines a relation with model 'AbstractModel', "
"which is either not installed, or is abstract."),
hint=None,
obj=field,
id='fields.E300',
),
]
self.assertEqual(errors, expected)
def test_m2m_to_abstract_model(self):
class AbstractModel(models.Model):
class Meta:
abstract = True
class Model(models.Model):
m2m = models.ManyToManyField('AbstractModel')
field = Model._meta.get_field('m2m')
errors = field.check(from_model=Model)
expected = [
Error(
("Field defines a relation with model 'AbstractModel', "
"which is either not installed, or is abstract."),
hint=None,
obj=field,
id='fields.E300',
),
]
self.assertEqual(errors, expected)
def test_unique_m2m(self):
class Person(models.Model):
name = models.CharField(max_length=5)
class Group(models.Model):
members = models.ManyToManyField('Person', unique=True)
field = Group._meta.get_field('members')
errors = field.check(from_model=Group)
expected = [
Error(
'ManyToManyFields cannot be unique.',
hint=None,
obj=field,
id='fields.E330',
),
]
self.assertEqual(errors, expected)
def test_foreign_key_to_non_unique_field(self):
class Target(models.Model):
bad = models.IntegerField() # No unique=True
class Model(models.Model):
foreign_key = models.ForeignKey('Target', to_field='bad')
field = Model._meta.get_field('foreign_key')
errors = field.check()
expected = [
Error(
"'Target.bad' must set unique=True because it is referenced by a foreign key.",
hint=None,
obj=field,
id='fields.E311',
),
]
self.assertEqual(errors, expected)
def test_foreign_key_to_non_unique_field_under_explicit_model(self):
class Target(models.Model):
bad = models.IntegerField()
class Model(models.Model):
field = models.ForeignKey(Target, to_field='bad')
field = Model._meta.get_field('field')
errors = field.check()
expected = [
Error(
"'Target.bad' must set unique=True because it is referenced by a foreign key.",
hint=None,
obj=field,
id='fields.E311',
),
]
self.assertEqual(errors, expected)
def test_foreign_object_to_non_unique_fields(self):
class Person(models.Model):
# Note that both fields are not unique.
country_id = models.IntegerField()
city_id = models.IntegerField()
class MMembership(models.Model):
person_country_id = models.IntegerField()
person_city_id = models.IntegerField()
person = models.ForeignObject(Person,
from_fields=['person_country_id', 'person_city_id'],
to_fields=['country_id', 'city_id'])
field = MMembership._meta.get_field('person')
errors = field.check()
expected = [
Error(
("None of the fields 'country_id', 'city_id' on model 'Person' "
"have a unique=True constraint."),
hint=None,
obj=field,
id='fields.E310',
)
]
self.assertEqual(errors, expected)
def test_on_delete_set_null_on_non_nullable_field(self):
class Person(models.Model):
pass
class Model(models.Model):
foreign_key = models.ForeignKey('Person',
on_delete=models.SET_NULL)
field = Model._meta.get_field('foreign_key')
errors = field.check()
expected = [
Error(
'Field specifies on_delete=SET_NULL, but cannot be null.',
hint='Set null=True argument on the field, or change the on_delete rule.',
obj=field,
id='fields.E320',
),
]
self.assertEqual(errors, expected)
def test_on_delete_set_default_without_default_value(self):
class Person(models.Model):
pass
class Model(models.Model):
foreign_key = models.ForeignKey('Person',
on_delete=models.SET_DEFAULT)
field = Model._meta.get_field('foreign_key')
errors = field.check()
expected = [
Error(
'Field specifies on_delete=SET_DEFAULT, but has no default value.',
hint='Set a default value, or change the on_delete rule.',
obj=field,
id='fields.E321',
),
]
self.assertEqual(errors, expected)
@skipIfDBFeature('interprets_empty_strings_as_nulls')
def test_nullable_primary_key(self):
class Model(models.Model):
field = models.IntegerField(primary_key=True, null=True)
field = Model._meta.get_field('field')
errors = field.check()
expected = [
Error(
'Primary keys must not have null=True.',
hint='Set null=False on the field, or remove primary_key=True argument.',
obj=field,
id='fields.E007',
),
]
self.assertEqual(errors, expected)
def test_not_swapped_model(self):
class SwappableModel(models.Model):
# A model that can be, but isn't swapped out. References to this
# model should *not* raise any validation error.
class Meta:
swappable = 'TEST_SWAPPABLE_MODEL'
class Model(models.Model):
explicit_fk = models.ForeignKey(SwappableModel,
related_name='explicit_fk')
implicit_fk = models.ForeignKey('invalid_models_tests.SwappableModel',
related_name='implicit_fk')
explicit_m2m = models.ManyToManyField(SwappableModel,
related_name='explicit_m2m')
implicit_m2m = models.ManyToManyField(
'invalid_models_tests.SwappableModel',
related_name='implicit_m2m')
explicit_fk = Model._meta.get_field('explicit_fk')
self.assertEqual(explicit_fk.check(), [])
implicit_fk = Model._meta.get_field('implicit_fk')
self.assertEqual(implicit_fk.check(), [])
explicit_m2m = Model._meta.get_field('explicit_m2m')
self.assertEqual(explicit_m2m.check(from_model=Model), [])
implicit_m2m = Model._meta.get_field('implicit_m2m')
self.assertEqual(implicit_m2m.check(from_model=Model), [])
@override_settings(TEST_SWAPPED_MODEL='invalid_models_tests.Replacement')
def test_referencing_to_swapped_model(self):
class Replacement(models.Model):
pass
class SwappedModel(models.Model):
class Meta:
swappable = 'TEST_SWAPPED_MODEL'
class Model(models.Model):
explicit_fk = models.ForeignKey(SwappedModel,
related_name='explicit_fk')
implicit_fk = models.ForeignKey('invalid_models_tests.SwappedModel',
related_name='implicit_fk')
explicit_m2m = models.ManyToManyField(SwappedModel,
related_name='explicit_m2m')
implicit_m2m = models.ManyToManyField(
'invalid_models_tests.SwappedModel',
related_name='implicit_m2m')
fields = [
Model._meta.get_field('explicit_fk'),
Model._meta.get_field('implicit_fk'),
Model._meta.get_field('explicit_m2m'),
Model._meta.get_field('implicit_m2m'),
]
expected_error = Error(
("Field defines a relation with the model "
"'invalid_models_tests.SwappedModel', which has been swapped out."),
hint="Update the relation to point at 'settings.TEST_SWAPPED_MODEL'.",
id='fields.E301',
)
for field in fields:
expected_error.obj = field
errors = field.check(from_model=Model)
self.assertEqual(errors, [expected_error])
def test_related_field_has_invalid_related_name(self):
digit = 0
illegal_non_alphanumeric = '!'
whitespace = '\t'
invalid_related_names = [
'%s_begins_with_digit' % digit,
'%s_begins_with_illegal_non_alphanumeric' % illegal_non_alphanumeric,
'%s_begins_with_whitespace' % whitespace,
'contains_%s_illegal_non_alphanumeric' % illegal_non_alphanumeric,
'contains_%s_whitespace' % whitespace,
'ends_with_with_illegal_non_alphanumeric_%s' % illegal_non_alphanumeric,
'ends_with_whitespace_%s' % whitespace,
# Python's keyword
'with',
]
class Parent(models.Model):
pass
for invalid_related_name in invalid_related_names:
Child = type(str('Child_%s') % str(invalid_related_name), (models.Model,), {
'parent': models.ForeignKey('Parent', related_name=invalid_related_name),
'__module__': Parent.__module__,
})
field = Child._meta.get_field('parent')
errors = Child.check()
expected = [
Error(
"The name '%s' is invalid related_name for field Child_%s.parent"
% (invalid_related_name, invalid_related_name),
hint="Related name must be a valid Python identifier or end with a '+'",
obj=field,
id='fields.E306',
),
]
self.assertEqual(errors, expected)
def test_related_field_has_valid_related_name(self):
lowercase = 'a'
uppercase = 'A'
digit = 0
related_names = [
'%s_starts_with_lowercase' % lowercase,
'%s_tarts_with_uppercase' % uppercase,
'_starts_with_underscore',
'contains_%s_digit' % digit,
'ends_with_plus+',
'_',
'_+',
'+',
]
class Parent(models.Model):
pass
for related_name in related_names:
Child = type(str('Child_%s') % str(related_name), (models.Model,), {
'parent': models.ForeignKey('Parent', related_name=related_name),
'__module__': Parent.__module__,
})
errors = Child.check()
self.assertFalse(errors)
class AccessorClashTests(IsolatedModelsTestCase):
def test_fk_to_integer(self):
self._test_accessor_clash(
target=models.IntegerField(),
relative=models.ForeignKey('Target'))
def test_fk_to_fk(self):
self._test_accessor_clash(
target=models.ForeignKey('Another'),
relative=models.ForeignKey('Target'))
def test_fk_to_m2m(self):
self._test_accessor_clash(
target=models.ManyToManyField('Another'),
relative=models.ForeignKey('Target'))
def test_m2m_to_integer(self):
self._test_accessor_clash(
target=models.IntegerField(),
relative=models.ManyToManyField('Target'))
def test_m2m_to_fk(self):
self._test_accessor_clash(
target=models.ForeignKey('Another'),
relative=models.ManyToManyField('Target'))
def test_m2m_to_m2m(self):
self._test_accessor_clash(
target=models.ManyToManyField('Another'),
relative=models.ManyToManyField('Target'))
def _test_accessor_clash(self, target, relative):
class Another(models.Model):
pass
class Target(models.Model):
model_set = target
class Model(models.Model):
rel = relative
errors = Model.check()
expected = [
Error(
"Reverse accessor for 'Model.rel' clashes with field name 'Target.model_set'.",
hint=("Rename field 'Target.model_set', or add/change "
"a related_name argument to the definition "
"for field 'Model.rel'."),
obj=Model._meta.get_field('rel'),
id='fields.E302',
),
]
self.assertEqual(errors, expected)
def test_clash_between_accessors(self):
class Target(models.Model):
pass
class Model(models.Model):
foreign = models.ForeignKey(Target)
m2m = models.ManyToManyField(Target)
errors = Model.check()
expected = [
Error(
"Reverse accessor for 'Model.foreign' clashes with reverse accessor for 'Model.m2m'.",
hint=("Add or change a related_name argument to the definition "
"for 'Model.foreign' or 'Model.m2m'."),
obj=Model._meta.get_field('foreign'),
id='fields.E304',
),
Error(
"Reverse accessor for 'Model.m2m' clashes with reverse accessor for 'Model.foreign'.",
hint=("Add or change a related_name argument to the definition "
"for 'Model.m2m' or 'Model.foreign'."),
obj=Model._meta.get_field('m2m'),
id='fields.E304',
),
]
self.assertEqual(errors, expected)
def test_m2m_to_m2m_with_inheritance(self):
""" Ref #22047. """
class Target(models.Model):
pass
class Model(models.Model):
children = models.ManyToManyField('Child',
related_name="m2m_clash", related_query_name="no_clash")
class Parent(models.Model):
m2m_clash = models.ManyToManyField('Target')
class Child(Parent):
pass
errors = Model.check()
expected = [
Error(
"Reverse accessor for 'Model.children' clashes with field name 'Child.m2m_clash'.",
hint=("Rename field 'Child.m2m_clash', or add/change "
"a related_name argument to the definition "
"for field 'Model.children'."),
obj=Model._meta.get_field('children'),
id='fields.E302',
)
]
self.assertEqual(errors, expected)
class ReverseQueryNameClashTests(IsolatedModelsTestCase):
def test_fk_to_integer(self):
self._test_reverse_query_name_clash(
target=models.IntegerField(),
relative=models.ForeignKey('Target'))
def test_fk_to_fk(self):
self._test_reverse_query_name_clash(
target=models.ForeignKey('Another'),
relative=models.ForeignKey('Target'))
def test_fk_to_m2m(self):
self._test_reverse_query_name_clash(
target=models.ManyToManyField('Another'),
relative=models.ForeignKey('Target'))
def test_m2m_to_integer(self):
self._test_reverse_query_name_clash(
target=models.IntegerField(),
relative=models.ManyToManyField('Target'))
def test_m2m_to_fk(self):
self._test_reverse_query_name_clash(
target=models.ForeignKey('Another'),
relative=models.ManyToManyField('Target'))
def test_m2m_to_m2m(self):
self._test_reverse_query_name_clash(
target=models.ManyToManyField('Another'),
relative=models.ManyToManyField('Target'))
def _test_reverse_query_name_clash(self, target, relative):
class Another(models.Model):
pass
class Target(models.Model):
model = target
class Model(models.Model):
rel = relative
errors = Model.check()
expected = [
Error(
"Reverse query name for 'Model.rel' clashes with field name 'Target.model'.",
hint=("Rename field 'Target.model', or add/change "
"a related_name argument to the definition "
"for field 'Model.rel'."),
obj=Model._meta.get_field('rel'),
id='fields.E303',
),
]
self.assertEqual(errors, expected)
class ExplicitRelatedNameClashTests(IsolatedModelsTestCase):
def test_fk_to_integer(self):
self._test_explicit_related_name_clash(
target=models.IntegerField(),
relative=models.ForeignKey('Target', related_name='clash'))
def test_fk_to_fk(self):
self._test_explicit_related_name_clash(
target=models.ForeignKey('Another'),
relative=models.ForeignKey('Target', related_name='clash'))
def test_fk_to_m2m(self):
self._test_explicit_related_name_clash(
target=models.ManyToManyField('Another'),
relative=models.ForeignKey('Target', related_name='clash'))
def test_m2m_to_integer(self):
self._test_explicit_related_name_clash(
target=models.IntegerField(),
relative=models.ManyToManyField('Target', related_name='clash'))
def test_m2m_to_fk(self):
self._test_explicit_related_name_clash(
target=models.ForeignKey('Another'),
relative=models.ManyToManyField('Target', related_name='clash'))
def test_m2m_to_m2m(self):
self._test_explicit_related_name_clash(
target=models.ManyToManyField('Another'),
relative=models.ManyToManyField('Target', related_name='clash'))
def _test_explicit_related_name_clash(self, target, relative):
class Another(models.Model):
pass
class Target(models.Model):
clash = target
class Model(models.Model):
rel = relative
errors = Model.check()
expected = [
Error(
"Reverse accessor for 'Model.rel' clashes with field name 'Target.clash'.",
hint=("Rename field 'Target.clash', or add/change "
"a related_name argument to the definition "
"for field 'Model.rel'."),
obj=Model._meta.get_field('rel'),
id='fields.E302',
),
Error(
"Reverse query name for 'Model.rel' clashes with field name 'Target.clash'.",
hint=("Rename field 'Target.clash', or add/change "
"a related_name argument to the definition "
"for field 'Model.rel'."),
obj=Model._meta.get_field('rel'),
id='fields.E303',
),
]
self.assertEqual(errors, expected)
class ExplicitRelatedQueryNameClashTests(IsolatedModelsTestCase):
def test_fk_to_integer(self):
self._test_explicit_related_query_name_clash(
target=models.IntegerField(),
relative=models.ForeignKey('Target',
related_query_name='clash'))
def test_fk_to_fk(self):
self._test_explicit_related_query_name_clash(
target=models.ForeignKey('Another'),
relative=models.ForeignKey('Target',
related_query_name='clash'))
def test_fk_to_m2m(self):
self._test_explicit_related_query_name_clash(
target=models.ManyToManyField('Another'),
relative=models.ForeignKey('Target',
related_query_name='clash'))
def test_m2m_to_integer(self):
self._test_explicit_related_query_name_clash(
target=models.IntegerField(),
relative=models.ManyToManyField('Target',
related_query_name='clash'))
def test_m2m_to_fk(self):
self._test_explicit_related_query_name_clash(
target=models.ForeignKey('Another'),
relative=models.ManyToManyField('Target',
related_query_name='clash'))
def test_m2m_to_m2m(self):
self._test_explicit_related_query_name_clash(
target=models.ManyToManyField('Another'),
relative=models.ManyToManyField('Target',
related_query_name='clash'))
def _test_explicit_related_query_name_clash(self, target, relative):
class Another(models.Model):
pass
class Target(models.Model):
clash = target
class Model(models.Model):
rel = relative
errors = Model.check()
expected = [
Error(
"Reverse query name for 'Model.rel' clashes with field name 'Target.clash'.",
hint=("Rename field 'Target.clash', or add/change a related_name "
"argument to the definition for field 'Model.rel'."),
obj=Model._meta.get_field('rel'),
id='fields.E303',
),
]
self.assertEqual(errors, expected)
class SelfReferentialM2MClashTests(IsolatedModelsTestCase):
def test_clash_between_accessors(self):
class Model(models.Model):
first_m2m = models.ManyToManyField('self', symmetrical=False)
second_m2m = models.ManyToManyField('self', symmetrical=False)
errors = Model.check()
expected = [
Error(
"Reverse accessor for 'Model.first_m2m' clashes with reverse accessor for 'Model.second_m2m'.",
hint=("Add or change a related_name argument to the definition "
"for 'Model.first_m2m' or 'Model.second_m2m'."),
obj=Model._meta.get_field('first_m2m'),
id='fields.E304',
),
Error(
"Reverse accessor for 'Model.second_m2m' clashes with reverse accessor for 'Model.first_m2m'.",
hint=("Add or change a related_name argument to the definition "
"for 'Model.second_m2m' or 'Model.first_m2m'."),
obj=Model._meta.get_field('second_m2m'),
id='fields.E304',
),
]
self.assertEqual(errors, expected)
def test_accessor_clash(self):
class Model(models.Model):
model_set = models.ManyToManyField("self", symmetrical=False)
errors = Model.check()
expected = [
Error(
"Reverse accessor for 'Model.model_set' clashes with field name 'Model.model_set'.",
hint=("Rename field 'Model.model_set', or add/change "
"a related_name argument to the definition "
"for field 'Model.model_set'."),
obj=Model._meta.get_field('model_set'),
id='fields.E302',
),
]
self.assertEqual(errors, expected)
def test_reverse_query_name_clash(self):
class Model(models.Model):
model = models.ManyToManyField("self", symmetrical=False)
errors = Model.check()
expected = [
Error(
"Reverse query name for 'Model.model' clashes with field name 'Model.model'.",
hint=("Rename field 'Model.model', or add/change a related_name "
"argument to the definition for field 'Model.model'."),
obj=Model._meta.get_field('model'),
id='fields.E303',
),
]
self.assertEqual(errors, expected)
def test_clash_under_explicit_related_name(self):
class Model(models.Model):
clash = models.IntegerField()
m2m = models.ManyToManyField("self",
symmetrical=False, related_name='clash')
errors = Model.check()
expected = [
Error(
"Reverse accessor for 'Model.m2m' clashes with field name 'Model.clash'.",
hint=("Rename field 'Model.clash', or add/change a related_name "
"argument to the definition for field 'Model.m2m'."),
obj=Model._meta.get_field('m2m'),
id='fields.E302',
),
Error(
"Reverse query name for 'Model.m2m' clashes with field name 'Model.clash'.",
hint=("Rename field 'Model.clash', or add/change a related_name "
"argument to the definition for field 'Model.m2m'."),
obj=Model._meta.get_field('m2m'),
id='fields.E303',
),
]
self.assertEqual(errors, expected)
def test_valid_model(self):
class Model(models.Model):
first = models.ManyToManyField("self",
symmetrical=False, related_name='first_accessor')
second = models.ManyToManyField("self",
symmetrical=False, related_name='second_accessor')
errors = Model.check()
self.assertEqual(errors, [])
class SelfReferentialFKClashTests(IsolatedModelsTestCase):
def test_accessor_clash(self):
class Model(models.Model):
model_set = models.ForeignKey("Model")
errors = Model.check()
expected = [
Error(
"Reverse accessor for 'Model.model_set' clashes with field name 'Model.model_set'.",
hint=("Rename field 'Model.model_set', or add/change "
"a related_name argument to the definition "
"for field 'Model.model_set'."),
obj=Model._meta.get_field('model_set'),
id='fields.E302',
),
]
self.assertEqual(errors, expected)
def test_reverse_query_name_clash(self):
class Model(models.Model):
model = models.ForeignKey("Model")
errors = Model.check()
expected = [
Error(
"Reverse query name for 'Model.model' clashes with field name 'Model.model'.",
hint=("Rename field 'Model.model', or add/change "
"a related_name argument to the definition "
"for field 'Model.model'."),
obj=Model._meta.get_field('model'),
id='fields.E303',
),
]
self.assertEqual(errors, expected)
def test_clash_under_explicit_related_name(self):
class Model(models.Model):
clash = models.CharField(max_length=10)
foreign = models.ForeignKey("Model", related_name='clash')
errors = Model.check()
expected = [
Error(
"Reverse accessor for 'Model.foreign' clashes with field name 'Model.clash'.",
hint=("Rename field 'Model.clash', or add/change "
"a related_name argument to the definition "
"for field 'Model.foreign'."),
obj=Model._meta.get_field('foreign'),
id='fields.E302',
),
Error(
"Reverse query name for 'Model.foreign' clashes with field name 'Model.clash'.",
hint=("Rename field 'Model.clash', or add/change "
"a related_name argument to the definition "
"for field 'Model.foreign'."),
obj=Model._meta.get_field('foreign'),
id='fields.E303',
),
]
self.assertEqual(errors, expected)
class ComplexClashTests(IsolatedModelsTestCase):
# New tests should not be included here, because this is a single,
# self-contained sanity check, not a test of everything.
def test_complex_clash(self):
class Target(models.Model):
tgt_safe = models.CharField(max_length=10)
clash = models.CharField(max_length=10)
model = models.CharField(max_length=10)
clash1_set = models.CharField(max_length=10)
class Model(models.Model):
src_safe = models.CharField(max_length=10)
foreign_1 = models.ForeignKey(Target, related_name='id')
foreign_2 = models.ForeignKey(Target, related_name='src_safe')
m2m_1 = models.ManyToManyField(Target, related_name='id')
m2m_2 = models.ManyToManyField(Target, related_name='src_safe')
errors = Model.check()
expected = [
Error(
"Reverse accessor for 'Model.foreign_1' clashes with field name 'Target.id'.",
hint=("Rename field 'Target.id', or add/change a related_name "
"argument to the definition for field 'Model.foreign_1'."),
obj=Model._meta.get_field('foreign_1'),
id='fields.E302',
),
Error(
"Reverse query name for 'Model.foreign_1' clashes with field name 'Target.id'.",
hint=("Rename field 'Target.id', or add/change a related_name "
"argument to the definition for field 'Model.foreign_1'."),
obj=Model._meta.get_field('foreign_1'),
id='fields.E303',
),
Error(
"Reverse accessor for 'Model.foreign_1' clashes with reverse accessor for 'Model.m2m_1'.",
hint=("Add or change a related_name argument to "
"the definition for 'Model.foreign_1' or 'Model.m2m_1'."),
obj=Model._meta.get_field('foreign_1'),
id='fields.E304',
),
Error(
"Reverse query name for 'Model.foreign_1' clashes with reverse query name for 'Model.m2m_1'.",
hint=("Add or change a related_name argument to "
"the definition for 'Model.foreign_1' or 'Model.m2m_1'."),
obj=Model._meta.get_field('foreign_1'),
id='fields.E305',
),
Error(
"Reverse accessor for 'Model.foreign_2' clashes with reverse accessor for 'Model.m2m_2'.",
hint=("Add or change a related_name argument "
"to the definition for 'Model.foreign_2' or 'Model.m2m_2'."),
obj=Model._meta.get_field('foreign_2'),
id='fields.E304',
),
Error(
"Reverse query name for 'Model.foreign_2' clashes with reverse query name for 'Model.m2m_2'.",
hint=("Add or change a related_name argument to "
"the definition for 'Model.foreign_2' or 'Model.m2m_2'."),
obj=Model._meta.get_field('foreign_2'),
id='fields.E305',
),
Error(
"Reverse accessor for 'Model.m2m_1' clashes with field name 'Target.id'.",
hint=("Rename field 'Target.id', or add/change a related_name "
"argument to the definition for field 'Model.m2m_1'."),
obj=Model._meta.get_field('m2m_1'),
id='fields.E302',
),
Error(
"Reverse query name for 'Model.m2m_1' clashes with field name 'Target.id'.",
hint=("Rename field 'Target.id', or add/change a related_name "
"argument to the definition for field 'Model.m2m_1'."),
obj=Model._meta.get_field('m2m_1'),
id='fields.E303',
),
Error(
"Reverse accessor for 'Model.m2m_1' clashes with reverse accessor for 'Model.foreign_1'.",
hint=("Add or change a related_name argument to the definition "
"for 'Model.m2m_1' or 'Model.foreign_1'."),
obj=Model._meta.get_field('m2m_1'),
id='fields.E304',
),
Error(
"Reverse query name for 'Model.m2m_1' clashes with reverse query name for 'Model.foreign_1'.",
hint=("Add or change a related_name argument to "
"the definition for 'Model.m2m_1' or 'Model.foreign_1'."),
obj=Model._meta.get_field('m2m_1'),
id='fields.E305',
),
Error(
"Reverse accessor for 'Model.m2m_2' clashes with reverse accessor for 'Model.foreign_2'.",
hint=("Add or change a related_name argument to the definition "
"for 'Model.m2m_2' or 'Model.foreign_2'."),
obj=Model._meta.get_field('m2m_2'),
id='fields.E304',
),
Error(
"Reverse query name for 'Model.m2m_2' clashes with reverse query name for 'Model.foreign_2'.",
hint=("Add or change a related_name argument to the definition "
"for 'Model.m2m_2' or 'Model.foreign_2'."),
obj=Model._meta.get_field('m2m_2'),
id='fields.E305',
),
]
self.assertEqual(errors, expected)
class M2mThroughFieldsTests(IsolatedModelsTestCase):
def test_m2m_field_argument_validation(self):
"""
Tests that ManyToManyField accepts the ``through_fields`` kwarg
only if an intermediary table is specified.
"""
class Fan(models.Model):
pass
self.assertRaisesMessage(
ValueError, 'Cannot specify through_fields without a through model',
models.ManyToManyField, Fan, through_fields=('f1', 'f2'))
def test_invalid_order(self):
"""
Tests that mixing up the order of link fields to ManyToManyField.through_fields
triggers validation errors.
"""
class Fan(models.Model):
pass
class Event(models.Model):
invitees = models.ManyToManyField(Fan, through='Invitation', through_fields=('invitee', 'event'))
class Invitation(models.Model):
event = models.ForeignKey(Event)
invitee = models.ForeignKey(Fan)
inviter = models.ForeignKey(Fan, related_name='+')
field = Event._meta.get_field('invitees')
errors = field.check(from_model=Event)
expected = [
Error(
("'Invitation.invitee' is not a foreign key to 'Event'."),
hint="Did you mean one of the following foreign keys to 'Event': event?",
obj=field,
id='fields.E339'),
Error(
("'Invitation.event' is not a foreign key to 'Fan'."),
hint="Did you mean one of the following foreign keys to 'Fan': invitee, inviter?",
obj=field,
id='fields.E339'),
]
self.assertEqual(expected, errors)
def test_invalid_field(self):
"""
Tests that providing invalid field names to ManyToManyField.through_fields
triggers validation errors.
"""
class Fan(models.Model):
pass
class Event(models.Model):
invitees = models.ManyToManyField(Fan, through='Invitation', through_fields=('invalid_field_1', 'invalid_field_2'))
class Invitation(models.Model):
event = models.ForeignKey(Event)
invitee = models.ForeignKey(Fan)
inviter = models.ForeignKey(Fan, related_name='+')
field = Event._meta.get_field('invitees')
errors = field.check(from_model=Event)
expected = [
Error(
("The intermediary model 'invalid_models_tests.Invitation' has no field 'invalid_field_1'."),
hint="Did you mean one of the following foreign keys to 'Event': event?",
obj=field,
id='fields.E338'),
Error(
("The intermediary model 'invalid_models_tests.Invitation' has no field 'invalid_field_2'."),
hint="Did you mean one of the following foreign keys to 'Fan': invitee, inviter?",
obj=field,
id='fields.E338'),
]
self.assertEqual(expected, errors)
def test_explicit_field_names(self):
"""
Tests that if ``through_fields`` kwarg is given, it must specify both
link fields of the intermediary table.
"""
class Fan(models.Model):
pass
class Event(models.Model):
invitees = models.ManyToManyField(Fan, through='Invitation', through_fields=(None, 'invitee'))
class Invitation(models.Model):
event = models.ForeignKey(Event)
invitee = models.ForeignKey(Fan)
inviter = models.ForeignKey(Fan, related_name='+')
field = Event._meta.get_field('invitees')
errors = field.check(from_model=Event)
expected = [
Error(
("Field specifies 'through_fields' but does not provide the names "
"of the two link fields that should be used for the relation "
"through model 'invalid_models_tests.Invitation'."),
hint=("Make sure you specify 'through_fields' as "
"through_fields=('field1', 'field2')"),
obj=field,
id='fields.E337')]
self.assertEqual(expected, errors)