#27875: Manager inheritance for multi-table inheritance model behaviour
-------------------------------------+-------------------------------------
Reporter: ek-init | Owner: nobody
Type: Bug | Status: new
Component: | Version: 1.10
Uncategorized |
Severity: Normal | Keywords: Manager inheritance
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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The Managers documentation says:
> Managers from base classes are always inherited by the child class,
using Python’s normal name resolution order (names on the child class
override all others; then come names on the first parent class, and so
on).
> If no managers are declared on a model and/or its parents, Django
automatically creates the objects manager.
For abstract base classes this works properly, inheriting the manager from
the base model and therefore overriding the objects manager if so
declared.
For my non-abstract inheritance example, this does not work the same way
...
{{{
#!python
class MyManager(models.Manager):
pass
class A(models.Model):
objects = MyManager()
other = MyManager()
class B(A):
pass
}}}
{{{
In [4]: B.objects.__class__
Out[4]: django.db.models.manager.Manager
In [5]: B.other.__class__
Out[5]: test_app.models.MyManager
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/27875>
Django <https://code.djangoproject.com/>
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