no-bulk-delete django admin action

admin.py

class NoBulkDeleteAdmin(admin.ModelAdmin):
    def get_actions(self, request):
        actions = super(NoBulkDeleteAdmin, self).get_actions(request)
        del actions['delete_selected']
        actions['delete_selected'] = (
            NoBulkDeleteAdmin.no_bulk_delete,
            'delete_selected',
            'Delete Selected instances and delete docker instances.'
        )
        return actions

    def no_bulk_delete(self, request, queryset):
        n = 0
        for obj in queryset:
            obj.delete()
            n += 1
        self.message_user(request, "Successfully deleted %(count)d %(items)s." % {
            "count": n, "items": model_ngettext(self.opts, n)
        }, messages.SUCCESS)
        return None