I was going
through
https://docs.djangoproject.com/en/1.9/topics/db/managers/#custom-managers-and-model-inheritance
regarding custom managers and I decided to do some tests. Here are my
models:
from django.db import models
class CustomManager(models.Manager):
use_for_related_fields = True
class ExtraManager(models.Manager):
use_for_related_fields = True
class AnotherManager(models.Manager):
use_for_related_fields = True
class A(models.Model):
objects = CustomManager()
all_objects = AnotherManager()
class Meta:
abstract = True
class B(A):
pass
class C(A):
objects = ExtraManager()
class D(C):
pass
class E(A):
all_objects = AnotherManager()
objects = ExtraManager()
class F(E):
pass
Here are the results of few code executions:
In [1]: from app.models import *
In [2]: F.objects
Out[2]: <django.db.models.manager.Manager at 0x7f160dfe8e48>
In [3]: D.objects
Out[3]: <app.models.ExtraManager at 0x7f160dfe80b8>
In [4]: D._default_manager
Out[4]: <app.models.AnotherManager at 0x7f160dfe8978>
In [5]: F._de
F._default_manager F._deferred
In [5]: F._default_manager
Out[5]: <django.db.models.manager.Manager at 0x7f160dfe8e48>
In [6]: F.all_objects
Out[6]: <app.models.AnotherManager at 0x7f160dfe87f0>
Here I have few queries:
- How come AnotherManager is default Manage for D? It is neither default
manager for C and neither it is first Manager in A.
- Why D.objects is ExtraManager (from C objects) but F.objects is default
Django Manager
Someone please help to understand theses. Thanks!
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