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[1.8.x] Fixed #25503 -- Fixed system check crash on ForeignKey to abstract model. 

Backport of 914167abf1 from master
This commit is contained in:
Mariusz Felisiak 2015-10-05 22:29:23 +02:00 committed by Tim Graham
parent 9be9c511cc
commit 4ec96b776b
4 changed files with 38 additions and 27 deletions
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1
AUTHORS
View File

@ -434,6 +434,7 @@ answer newbie questions, and generally made Django that much better:
Marian Andre <django@andre.sk>
Marijn Vriens <marijn@metronomo.cl>
Mario Gonzalez <gonzalemario@gmail.com>
Mariusz Felisiak <felisiak.mariusz@gmail.com>
Mark Biggers <biggers@utsl.com>
mark@junklight.com
Mark Lavin <markdlavin@gmail.com>

5
django/db/models/fields/related.py
View File

@ -1523,6 +1523,9 @@ class ForeignObject(RelatedField):
except AttributeError:
return []
if not self.foreign_related_fields:
return []
has_unique_field = any(rel_field.unique
for rel_field in self.foreign_related_fields)
if not has_unique_field and len(self.foreign_related_fields) > 1:
@ -1622,7 +1625,7 @@ class ForeignObject(RelatedField):
@property
def foreign_related_fields(self):
return tuple(rhs_field for lhs_field, rhs_field in self.related_fields)
return tuple(rhs_field for lhs_field, rhs_field in self.related_fields if rhs_field)
def get_local_related_value(self, instance):
return self.get_instance_value_for_fields(instance, self.local_related_fields)

3
docs/releases/1.8.6.txt
View File

@ -14,3 +14,6 @@ Bugfixes
* Allowed "mode=memory" in SQLite test database name if supported
(:ticket:`12118`).
* Fixed system check crash on ``ForeignKey`` to abstract model
(:ticket:`25503`).

56
tests/invalid_models_tests/test_relative_fields.py
View File

@ -296,25 +296,27 @@ class RelativeFieldTests(IsolatedModelsTestCase):
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',
),
class Model(models.Model):
rel_string_foreign_key = models.ForeignKey('AbstractModel')
rel_class_foreign_key = models.ForeignKey(AbstractModel)
fields = [
Model._meta.get_field('rel_string_foreign_key'),
Model._meta.get_field('rel_class_foreign_key'),
]
self.assertEqual(errors, expected)
expected_error = Error(
"Field defines a relation with model 'AbstractModel', "
"which is either not installed, or is abstract.",
id='fields.E300',
)
for field in fields:
expected_error.obj = field
errors = field.check()
self.assertEqual(errors, [expected_error])
def test_m2m_to_abstract_model(self):
class AbstractModel(models.Model):
@ -322,20 +324,22 @@ class RelativeFieldTests(IsolatedModelsTestCase):
abstract = True
class Model(models.Model):
m2m = models.ManyToManyField('AbstractModel')
rel_string_m2m = models.ManyToManyField('AbstractModel')
rel_class_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',
),
fields = [
Model._meta.get_field('rel_string_m2m'),
Model._meta.get_field('rel_class_m2m'),
]
self.assertEqual(errors, expected)
expected_error = Error(
"Field defines a relation with model 'AbstractModel', "
"which is either not installed, or is abstract.",
id='fields.E300',
)
for field in fields:
expected_error.obj = field
errors = field.check(from_model=Model)
self.assertEqual(errors, [expected_error])
def test_unique_m2m(self):
class Person(models.Model):