Modul Django Beitrag Admin hat keine Attribut -Aktion Action_Checkbox_Name
//Mass admin should now work when selecting all objects, not just those on the current page.
// Changed existing Django 1.9
selected = request.POST.getlist(admin.ACTION_CHECKBOX_NAME)
// to Django 3.2
selected_int = queryset.values_list('id', flat=True)
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