Force a model to appear on admin's index page depending on the request

[Olivier Dalang]

Hi !

Is it possible to force a model to appear on the admin index page depending on the request ?

I'm asking because I did override the has_change_permission() method of the ModelAdmin, so that the user can be allowed to change some instances (chosen via a ManyToMany relationship between the user and the instances).

So, the idea is (in pseudocode):

if user.has_permission( change_permission ):

    he can manage all the instances -> display the model in the admin

else:

    if user.allowed_instances.count()>0:

        he can manage some instances -> display the model in the admin

    else:

        he cannot manage any instances -> do not display the model in the admin

Thanks !!

Olivier