django/tests/invalid_models_tests/test_models.py

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# -*- encoding: utf-8 -*-
from __future__ import unicode_literals
import unittest
from django.conf import settings
from django.core.checks import Error
from django.db import connections, models
from django.test.utils import override_settings
from .base import IsolatedModelsTestCase
def get_max_column_name_length():
allowed_len = None
db_alias = None
for db in settings.DATABASES.keys():
connection = connections[db]
max_name_length = connection.ops.max_name_length()
if max_name_length is None or connection.features.truncates_names:
continue
else:
if allowed_len is None:
allowed_len = max_name_length
db_alias = db
elif max_name_length < allowed_len:
allowed_len = max_name_length
db_alias = db
return (allowed_len, db_alias)
class IndexTogetherTests(IsolatedModelsTestCase):
def test_non_iterable(self):
class Model(models.Model):
class Meta:
index_together = 42
errors = Model.check()
expected = [
Error(
"'index_together' must be a list or tuple.",
hint=None,
obj=Model,
id='models.E008',
),
]
self.assertEqual(errors, expected)
def test_non_list(self):
class Model(models.Model):
class Meta:
index_together = 'not-a-list'
errors = Model.check()
expected = [
Error(
"'index_together' must be a list or tuple.",
hint=None,
obj=Model,
id='models.E008',
),
]
self.assertEqual(errors, expected)
def test_list_containing_non_iterable(self):
class Model(models.Model):
class Meta:
index_together = [('a', 'b'), 42]
errors = Model.check()
expected = [
Error(
"All 'index_together' elements must be lists or tuples.",
hint=None,
obj=Model,
id='models.E009',
),
]
self.assertEqual(errors, expected)
def test_pointing_to_missing_field(self):
class Model(models.Model):
class Meta:
index_together = [
["missing_field"],
]
errors = Model.check()
expected = [
Error(
"'index_together' refers to the non-existent field 'missing_field'.",
hint=None,
obj=Model,
id='models.E012',
),
]
self.assertEqual(errors, expected)
def test_pointing_to_non_local_field(self):
class Foo(models.Model):
field1 = models.IntegerField()
class Bar(Foo):
field2 = models.IntegerField()
class Meta:
index_together = [
["field2", "field1"],
]
errors = Bar.check()
expected = [
Error(
"'index_together' refers to field 'field1' which is not "
"local to model 'Bar'.",
hint=("This issue may be caused by multi-table inheritance."),
obj=Bar,
id='models.E016',
),
]
self.assertEqual(errors, expected)
def test_pointing_to_m2m_field(self):
class Model(models.Model):
m2m = models.ManyToManyField('self')
class Meta:
index_together = [
["m2m"],
]
errors = Model.check()
expected = [
Error(
"'index_together' refers to a ManyToManyField 'm2m', but "
"ManyToManyFields are not permitted in 'index_together'.",
hint=None,
obj=Model,
id='models.E013',
),
]
self.assertEqual(errors, expected)
# unique_together tests are very similar to index_together tests.
class UniqueTogetherTests(IsolatedModelsTestCase):
def test_non_iterable(self):
class Model(models.Model):
class Meta:
unique_together = 42
errors = Model.check()
expected = [
Error(
"'unique_together' must be a list or tuple.",
hint=None,
obj=Model,
id='models.E010',
),
]
self.assertEqual(errors, expected)
def test_list_containing_non_iterable(self):
class Model(models.Model):
one = models.IntegerField()
two = models.IntegerField()
class Meta:
unique_together = [('a', 'b'), 42]
errors = Model.check()
expected = [
Error(
"All 'unique_together' elements must be lists or tuples.",
hint=None,
obj=Model,
id='models.E011',
),
]
self.assertEqual(errors, expected)
def test_non_list(self):
class Model(models.Model):
class Meta:
unique_together = 'not-a-list'
errors = Model.check()
expected = [
Error(
"'unique_together' must be a list or tuple.",
hint=None,
obj=Model,
id='models.E010',
),
]
self.assertEqual(errors, expected)
def test_valid_model(self):
class Model(models.Model):
one = models.IntegerField()
two = models.IntegerField()
class Meta:
# unique_together can be a simple tuple
unique_together = ('one', 'two')
errors = Model.check()
self.assertEqual(errors, [])
def test_pointing_to_missing_field(self):
class Model(models.Model):
class Meta:
unique_together = [
["missing_field"],
]
errors = Model.check()
expected = [
Error(
"'unique_together' refers to the non-existent field 'missing_field'.",
hint=None,
obj=Model,
id='models.E012',
),
]
self.assertEqual(errors, expected)
def test_pointing_to_m2m(self):
class Model(models.Model):
m2m = models.ManyToManyField('self')
class Meta:
unique_together = [
["m2m"],
]
errors = Model.check()
expected = [
Error(
"'unique_together' refers to a ManyToManyField 'm2m', but "
"ManyToManyFields are not permitted in 'unique_together'.",
hint=None,
obj=Model,
id='models.E013',
),
]
self.assertEqual(errors, expected)
class FieldNamesTests(IsolatedModelsTestCase):
def test_ending_with_underscore(self):
class Model(models.Model):
field_ = models.CharField(max_length=10)
m2m_ = models.ManyToManyField('self')
errors = Model.check()
expected = [
Error(
'Field names must not end with an underscore.',
hint=None,
obj=Model._meta.get_field('field_'),
id='fields.E001',
),
Error(
'Field names must not end with an underscore.',
hint=None,
obj=Model._meta.get_field('m2m_'),
id='fields.E001',
),
]
self.assertEqual(errors, expected)
max_column_name_length, column_limit_db_alias = get_max_column_name_length()
@unittest.skipIf(max_column_name_length is None,
"The database doesn't have a column name length limit.")
def test_M2M_long_column_name(self):
"""
#13711 -- Model check for long M2M column names when database has
column name length limits.
"""
allowed_len, db_alias = get_max_column_name_length()
# A model with very long name which will be used to set relations to.
class VeryLongModelNamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz(models.Model):
title = models.CharField(max_length=11)
# Main model for which checks will be performed.
class ModelWithLongField(models.Model):
m2m_field = models.ManyToManyField(
VeryLongModelNamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz,
related_name="rn1"
)
m2m_field2 = models.ManyToManyField(
VeryLongModelNamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz,
related_name="rn2", through='m2msimple'
)
m2m_field3 = models.ManyToManyField(
VeryLongModelNamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz,
related_name="rn3",
through='m2mcomplex'
)
fk = models.ForeignKey(
VeryLongModelNamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz,
models.CASCADE,
related_name="rn4",
)
# Models used for setting `through` in M2M field.
class m2msimple(models.Model):
id2 = models.ForeignKey(ModelWithLongField, models.CASCADE)
class m2mcomplex(models.Model):
id2 = models.ForeignKey(ModelWithLongField, models.CASCADE)
long_field_name = 'a' * (self.max_column_name_length + 1)
models.ForeignKey(
VeryLongModelNamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz,
models.CASCADE,
).contribute_to_class(m2msimple, long_field_name)
models.ForeignKey(
VeryLongModelNamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz,
models.CASCADE,
db_column=long_field_name
).contribute_to_class(m2mcomplex, long_field_name)
errors = ModelWithLongField.check()
# First error because of M2M field set on the model with long name.
m2m_long_name = "verylongmodelnamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz_id"
if self.max_column_name_length > len(m2m_long_name):
# Some databases support names longer than the test name.
expected = []
else:
expected = [
Error(
'Autogenerated column name too long for M2M field "%s". '
'Maximum length is "%s" for database "%s".'
% (m2m_long_name, self.max_column_name_length, self.column_limit_db_alias),
hint=("Use 'through' to create a separate model for "
"M2M and then set column_name using 'db_column'."),
obj=ModelWithLongField,
id='models.E019',
)
]
# Second error because the FK specified in the `through` model
# `m2msimple` has auto-generated name longer than allowed.
# There will be no check errors in the other M2M because it
# specifies db_column for the FK in `through` model even if the actual
# name is longer than the limits of the database.
expected.append(
Error(
'Autogenerated column name too long for M2M field "%s_id". '
'Maximum length is "%s" for database "%s".'
% (long_field_name, self.max_column_name_length, self.column_limit_db_alias),
hint=("Use 'through' to create a separate model for "
"M2M and then set column_name using 'db_column'."),
obj=ModelWithLongField,
id='models.E019',
)
)
self.assertEqual(errors, expected)
@unittest.skipIf(max_column_name_length is None,
"The database doesn't have a column name length limit.")
def test_local_field_long_column_name(self):
"""
#13711 -- Model check for long column names
when database does not support long names.
"""
allowed_len, db_alias = get_max_column_name_length()
class ModelWithLongField(models.Model):
title = models.CharField(max_length=11)
long_field_name = 'a' * (self.max_column_name_length + 1)
long_field_name2 = 'b' * (self.max_column_name_length + 1)
models.CharField(max_length=11).contribute_to_class(ModelWithLongField, long_field_name)
models.CharField(max_length=11, db_column='vlmn').contribute_to_class(ModelWithLongField, long_field_name2)
errors = ModelWithLongField.check()
# Error because of the field with long name added to the model
# without specifying db_column
expected = [
Error(
'Autogenerated column name too long for field "%s". '
'Maximum length is "%s" for database "%s".'
% (long_field_name, self.max_column_name_length, self.column_limit_db_alias),
hint="Set the column name manually using 'db_column'.",
obj=ModelWithLongField,
id='models.E018',
)
]
self.assertEqual(errors, expected)
def test_including_separator(self):
class Model(models.Model):
some__field = models.IntegerField()
errors = Model.check()
expected = [
Error(
'Field names must not contain "__".',
hint=None,
obj=Model._meta.get_field('some__field'),
id='fields.E002',
)
]
self.assertEqual(errors, expected)
def test_pk(self):
class Model(models.Model):
pk = models.IntegerField()
errors = Model.check()
expected = [
Error(
"'pk' is a reserved word that cannot be used as a field name.",
hint=None,
obj=Model._meta.get_field('pk'),
id='fields.E003',
)
]
self.assertEqual(errors, expected)
class ShadowingFieldsTests(IsolatedModelsTestCase):
def test_field_name_clash_with_child_accessor(self):
class Parent(models.Model):
pass
class Child(Parent):
child = models.CharField(max_length=100)
errors = Child.check()
expected = [
Error(
"The field 'child' clashes with the field "
"'child' from model 'invalid_models_tests.parent'.",
hint=None,
obj=Child._meta.get_field('child'),
id='models.E006',
)
]
self.assertEqual(errors, expected)
def test_multiinheritance_clash(self):
class Mother(models.Model):
clash = models.IntegerField()
class Father(models.Model):
clash = models.IntegerField()
class Child(Mother, Father):
# Here we have two clashed: id (automatic field) and clash, because
# both parents define these fields.
pass
errors = Child.check()
expected = [
Error(
"The field 'id' from parent model "
"'invalid_models_tests.mother' clashes with the field 'id' "
"from parent model 'invalid_models_tests.father'.",
hint=None,
obj=Child,
id='models.E005',
),
Error(
"The field 'clash' from parent model "
"'invalid_models_tests.mother' clashes with the field 'clash' "
"from parent model 'invalid_models_tests.father'.",
hint=None,
obj=Child,
id='models.E005',
)
]
self.assertEqual(errors, expected)
def test_inheritance_clash(self):
class Parent(models.Model):
f_id = models.IntegerField()
class Target(models.Model):
# This field doesn't result in a clash.
f_id = models.IntegerField()
class Child(Parent):
# This field clashes with parent "f_id" field.
f = models.ForeignKey(Target, models.CASCADE)
errors = Child.check()
expected = [
Error(
"The field 'f' clashes with the field 'f_id' "
"from model 'invalid_models_tests.parent'.",
hint=None,
obj=Child._meta.get_field('f'),
id='models.E006',
)
]
self.assertEqual(errors, expected)
def test_multigeneration_inheritance(self):
class GrandParent(models.Model):
clash = models.IntegerField()
class Parent(GrandParent):
pass
class Child(Parent):
pass
class GrandChild(Child):
clash = models.IntegerField()
errors = GrandChild.check()
expected = [
Error(
"The field 'clash' clashes with the field 'clash' "
"from model 'invalid_models_tests.grandparent'.",
hint=None,
obj=GrandChild._meta.get_field('clash'),
id='models.E006',
)
]
self.assertEqual(errors, expected)
def test_id_clash(self):
class Target(models.Model):
pass
class Model(models.Model):
fk = models.ForeignKey(Target, models.CASCADE)
fk_id = models.IntegerField()
errors = Model.check()
expected = [
Error(
"The field 'fk_id' clashes with the field 'fk' from model "
"'invalid_models_tests.model'.",
hint=None,
obj=Model._meta.get_field('fk_id'),
id='models.E006',
)
]
self.assertEqual(errors, expected)
class OtherModelTests(IsolatedModelsTestCase):
def test_unique_primary_key(self):
invalid_id = models.IntegerField(primary_key=False)
class Model(models.Model):
id = invalid_id
errors = Model.check()
expected = [
Error(
"'id' can only be used as a field name if the field also sets "
"'primary_key=True'.",
hint=None,
obj=Model,
id='models.E004',
),
]
self.assertEqual(errors, expected)
def test_ordering_non_iterable(self):
class Model(models.Model):
class Meta:
ordering = "missing_field"
errors = Model.check()
expected = [
Error(
"'ordering' must be a tuple or list "
"(even if you want to order by only one field).",
hint=None,
obj=Model,
id='models.E014',
),
]
self.assertEqual(errors, expected)
def test_just_ordering_no_errors(self):
class Model(models.Model):
order = models.PositiveIntegerField()
class Meta:
ordering = ['order']
self.assertEqual(Model.check(), [])
def test_just_order_with_respect_to_no_errors(self):
class Question(models.Model):
pass
class Answer(models.Model):
question = models.ForeignKey(Question, models.CASCADE)
class Meta:
order_with_respect_to = 'question'
self.assertEqual(Answer.check(), [])
def test_ordering_with_order_with_respect_to(self):
class Question(models.Model):
pass
class Answer(models.Model):
question = models.ForeignKey(Question, models.CASCADE)
order = models.IntegerField()
class Meta:
order_with_respect_to = 'question'
ordering = ['order']
errors = Answer.check()
expected = [
Error(
"'ordering' and 'order_with_respect_to' cannot be used together.",
hint=None,
obj=Answer,
id='models.E021',
),
]
self.assertEqual(errors, expected)
def test_non_valid(self):
class RelationModel(models.Model):
pass
class Model(models.Model):
relation = models.ManyToManyField(RelationModel)
class Meta:
ordering = ['relation']
errors = Model.check()
expected = [
Error(
"'ordering' refers to the non-existent field 'relation'.",
hint=None,
obj=Model,
id='models.E015',
),
]
self.assertEqual(errors, expected)
def test_ordering_pointing_to_missing_field(self):
class Model(models.Model):
class Meta:
ordering = ("missing_field",)
errors = Model.check()
expected = [
Error(
"'ordering' refers to the non-existent field 'missing_field'.",
hint=None,
obj=Model,
id='models.E015',
)
]
self.assertEqual(errors, expected)
def test_ordering_pointing_to_missing_foreignkey_field(self):
# refs #22711
class Model(models.Model):
missing_fk_field = models.IntegerField()
class Meta:
ordering = ("missing_fk_field_id",)
errors = Model.check()
expected = [
Error(
"'ordering' refers to the non-existent field 'missing_fk_field_id'.",
hint=None,
obj=Model,
id='models.E015',
)
]
self.assertEqual(errors, expected)
def test_ordering_pointing_to_existing_foreignkey_field(self):
# refs #22711
class Parent(models.Model):
pass
class Child(models.Model):
parent = models.ForeignKey(Parent, models.CASCADE)
class Meta:
ordering = ("parent_id",)
self.assertFalse(Child.check())
@override_settings(TEST_SWAPPED_MODEL_BAD_VALUE='not-a-model')
def test_swappable_missing_app_name(self):
class Model(models.Model):
class Meta:
swappable = 'TEST_SWAPPED_MODEL_BAD_VALUE'
errors = Model.check()
expected = [
Error(
"'TEST_SWAPPED_MODEL_BAD_VALUE' is not of the form 'app_label.app_name'.",
hint=None,
obj=None,
id='models.E001',
),
]
self.assertEqual(errors, expected)
@override_settings(TEST_SWAPPED_MODEL_BAD_MODEL='not_an_app.Target')
def test_swappable_missing_app(self):
class Model(models.Model):
class Meta:
swappable = 'TEST_SWAPPED_MODEL_BAD_MODEL'
errors = Model.check()
expected = [
Error(
"'TEST_SWAPPED_MODEL_BAD_MODEL' references 'not_an_app.Target', "
'which has not been installed, or is abstract.',
hint=None,
obj=None,
id='models.E002',
),
]
self.assertEqual(errors, expected)
def test_two_m2m_through_same_relationship(self):
class Person(models.Model):
pass
class Group(models.Model):
primary = models.ManyToManyField(Person,
through="Membership", related_name="primary")
secondary = models.ManyToManyField(Person, through="Membership",
related_name="secondary")
class Membership(models.Model):
person = models.ForeignKey(Person, models.CASCADE)
group = models.ForeignKey(Group, models.CASCADE)
errors = Group.check()
expected = [
Error(
"The model has two many-to-many relations through "
"the intermediate model 'invalid_models_tests.Membership'.",
hint=None,
obj=Group,
id='models.E003',
)
]
self.assertEqual(errors, expected)