Django - specify which model manager Django admin should use

Chris_Lawlor_21245 0
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I've created a custom Manager for a Django model which returns a QuerySet holding a subset of objects.all(). I need this to be the model's default Manager, since I am also creating a custom tag which will retrieve content from any model (specified by an argument), and needs to use the default Manager for the specified model. All that works fine, except - Django Admin is ALSO using the default Manager for this particular model, which means that not all model instances appear in the admin.

The Django docs don't help:

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. (Django Managers documentation)

The admin isn't supposed to use the default Manager, but it seems to be in my case. Note that I have also explicitly add the default Manager objects:

subset = CustomManager() # the default manager
objects = models.Manager() # the one I want admin to use

How can I specify which Manager the admin should use?

django python
4 Answers

The order in which you define your managers matters. Admin takes the first manager defined on the model.

So if you do like this:

subset = CustomManager() # the default manager
objects = models.Manager() # the one I want admin to use

the default manager will be subset

and if you do like this:

objects = models.Manager() # the default manager
subset = CustomManager() # your own manager

then the default manager will be objects.

user_21149350
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