What's the most pythonic way to test if obj has any permission from a list-CodePudding

In both Django and Django Guardian it's simple to test if a user has a permission:

user.has_perm('app.can_eat_pizzas')

It's also easy to test if it has all permissions:

user.has_perms(('app.add_student', 'app.can_deliver_pizzas'))

What's the most pythonic way to test if the user has any permission?

I know I can just chain an if/or statement, but this feels cumbersome:

if user.has_perm('app.add_student') or user.has_perm('app.can_deliver_pizzas')

CodePudding user response：

I would do something like:

if any(user.has_perm(perm_name) for perm_name in permission_list):
    # rest of code

(Using generator inside any() has an additinal benefit that it stop checking elements of the list after first True evaluation)

CodePudding user response：

You can get user all permissions by using user.user_permissions.all() or along with user.user_permissions.all().count() by checking length of permission objects if length is greater than 0.

There is another way to check if a user has permissions in a list by that user.user_permissions.filter(pk__in=<list>)

perms = Permission.objects.filter(pk__in=list)
perms.user.all()

Either you can get users based on permission or filter the by permissions list.

Hope it may help you