Restricting admin model entry

Question

I have a such model named Foo:

class Foo(models.Model):
    name = models.CharField()
    entry = models.DateField()

I have 2 types of users who can login to the admin panel, regular and superusers. I want to disallow the edition/deletion of Foo entries that are older than 2 days (by using the entry date field) but superusers may edit without any restriction. How can I achieve this? Thanks

Answer 1

Override ModelAdmin's queryset and has_change_permission :

from django.contrib.admin import ModelAdmin

class FooAdmin(ModelAdmin):
    def has_change_permission(self, request, obj):
        return obj is None or self.queryset(request).filter(pk=obj.pk).count() > 0

    def queryset(self, request):
        query = super(FooAdmin, self).queryset(request)
        if request.user.is_superuser:
            return query
        else:
            from datetime import datetime, timedelta 

            return query.filter(entry__gt=datetime.now()-timedelta(days=2))

admin.site.register(Foo, FooAdmin)

has_change_permission is used by the change view, and queryset by the list view. I reuse the queryset inside the overridden has_change_permission to stay DRY ( so you can add additional filters in queryset without caring to add this logic in the change permission check ), but it's worth mentioning that it costs an additional query.