Hi,
While going through the code for ModelBase I came across the following
which I was unable to get it clear from the documentation.
A model inheriting from a concrete model does not inherit the Meta class of
its parent no matter if it has a Meta of its own. However, it does inherit
2 options, which they are: *ordering* and *get_latest_by*. Even when it has
a Meta of its own, as long as those 2 options have not been overridden
explicitly. By contrast, inheriting from an abstract model inherits the
Meta class of the abstract model when it does not have a Meta class of its
own. What I find unclear, is, when a model inherits from an abstract model
which defines meta.ordering, if the child model also has its own Meta
class, it does not inherit the ordering option from it's parent.
Is this by design
class AbstractModelWithOrdering(models.Model):
name = models.CharField(max_length=255)
class Meta:
ordering = ['-name']
abstract = True
class ExtendAbstractModelWithOrdering(AbstractModelWithOrdering):
class Meta:
db_table = 'extended_abstract_model'
class ConcreteModelWithOrdering(models.Model):
name = models.CharField(max_length=255)
class Meta:
ordering = ['-name']
class ExtendConcreteModelWithOrdering(ConcreteModelWithOrdering):
class Meta:
db_table = 'extended_concrete_model'
class InheritedOrderingTests(SimpleTestCase):
def test_inheriting_from_abstract_with_meta_inherits_ordering(self):
self.assertEqual(ExtendAbstractModelWithOrdering._meta.ordering,
['-name'])
def test_inheriting_from_concrete_with_meta_inherits_ordering(self):
self.assertEqual(ExtendConcreteModelWithOrdering._meta.ordering,
['-name'])
======================================================================
FAIL: test_inheriting_from_abstract_with_meta_inherits_ordering
(model_meta.tests.InheritedOrderingTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/aron/django/django_repo/tests/model_meta/tests.py", line 280,
in test_inheriting_from_abstract_with_meta_inherits_ordering
self.assertEqual(ExtendAbstractModelWithOrdering._meta.ordering,
['-name'])
AssertionError: Lists differ: [] != ['-name']
Second list contains 1 additional elements.
First extra element 0:
-name
- []
+ ['-name']
----------------------------------------------------------------------
Ran 2 tests in 0.001s
FAILED (failures=1)
--
Aron Podrigal
-
'1000001', '1110010', '1101111', '1101110' '1010000', '1101111',
'1100100', '1110010', '1101001', '1100111', '1100001', '1101100'
P: '2b', '31', '33', '34', '37', '34', '35', '38', '36', '30', '39', '39'
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