Hi,
A recent bug report [1] brought up the fact that ModelAdmin collects
actions from superclasses. For example:
class BaseAdmin:
actions = ['a']
class SubAdmin(BaseAdmin):
actions = ['b']
SubAdmin will have action 'a' and 'b'. The behavior isn't tested and only
mentioned in passing in docs for ModelAdmin.get_action(), "Most of the time
you’ll use this method to conditionally remove actions from the list
gathered by the superclass."
I think the reason for the "collect from superclasses" behavior was to
inherit the "delete_selected" action from BaseModelAdmin, however, that
reason was obsoleted in a later commit where AdminSite actions were added
and delete_selected was moved there.
I propose removing this surprising (to me, at least) behavior and follow
normal Python inheritance. If someone wants to inherit actions from a
subclass, they should use:
class SubAdmin(BaseAdmin):
actions = BaseAdmin.actions + ['b']
[1] https://code.djangoproject.com/ticket/29917
[2]
https://github.com/django/django/commit/bb15cee58a43eeb0d060f8a31f9078b3406f195a
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