#9750: Manager Documentation and Admin interface
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Reporter: mm | Owner: nobody
Status: new | Milestone:
Component: Documentation | Version: 1.0
Keywords: | Stage: Unreviewed
Has_patch: 0 |
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In http://docs.djangoproject.com/en/dev/topics/db/managers/ it says:
{{{
If you use custom Manager objects, take note that the first Manager Django
encounters
(in the order in which they're defined in the model) has a special status.
Django
interprets this first Manager defined in a class as the "default" Manager,
and several
parts of Django (though not the admin application) will use that Manager
exclusively for
that model. As a result, it's often a good idea to be careful in your
choice of default
manager, in order to avoid a situation where overriding of get_query_set()
results in an
inability to retrieve objects you'd like to work with.
}}}
I found this to be wrong. The admin interface will only list the objects
that are in the queryset that the default manager returns
This will only return objects with a status of `finished=True` in the
admin, it's not even possible to access them directly by URL (default is
to create objects that won't show)
Note: code written from scratch but you should get the idea, mind the
order of appearance of the managers...
{{{
from django.db import models
from django.contrib import admin
class FinishedManager(models.Manager):
def get_query_set(self):
return super(FinishedManager,
self).get_query_set().filter(finished=True)
class Todo(models.Model):
title = models.CharField(max_length=250)
finished = models.BooleanField(default=False)
finished_objects = FinishedManager()
objects = models.Manager()
class TodoAdmin(admin.ModelAdmin):
model = Todo
admin.site.register(Todo, TodoAdmin)
}}}
while having a `Todo`-class like below will return all objects:
{{{
class Todo(models.Model):
title = models.CharField(max_length=250)
finished = models.BooleanField(default=False)
objects = models.Manager()
finished_objects = FinishedManager()
}}}
--
Ticket URL: <http://code.djangoproject.com/ticket/9750>
Django <http://code.djangoproject.com/>
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