#24156: inherited manytomany.all() empty when 2 or more inherited model from
asbtract one
-------------------------------------+-------------------------------------
Reporter: Pawamoy | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.7
(models, ORM) | Keywords: inherit asbtract
Severity: Normal | manytomanys
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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If you set a ManyToMany field in an abstract model, and then you use this
model as inheritance for 2 or more sub-models (non-abstracts), you will
not be able to use submodel_instance.manytomany_field.all() anymore
(actually it will work but return an empty list).
Here is an example of code producing this "bug":
{{{
from django.db import models
class Something(models.Model):
name = models.CharField('something', max_length=255)
def __unicode__(self):
return self.name
class AbstractModel(models.Model):
manythings = models.ManyToManyField(
Something, verbose_name='manythings', related_name='+',
blank=True, null=True)
class Meta:
abstract = True
class BugModel1(AbstractModel):
custom1 = models.CharField('custom_field', max_length=255)
class BugModel2(AbstractModel):
custom2 = models.CharField('custom_field', max_length=255)
}}}
When you add a Something instance to the manythings field of a BugModelN
instance, it is correctly added (I was able to confirm this by trying to
delete the object through admin interface: it lists the foreign key
related object that will be deleted on cascade), but when you want to get
it through the all() method of the manytomany field, it returns an empty
list.
I am not sure if it is a bug since I was not able to get any raised error
or else through debug. Maybe a voluntary behavior or a forgotten use case?
(Django 1.7.3)
--
Ticket URL: <https://code.djangoproject.com/ticket/24156>
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