How can I set a different message value per condition in a django-rest-framework custom permissions class?

Question

I have a permissions class similar to the answer here.

I'd like to set a different message value under different conditions. How can I do this?

Answer 1

class UserPermission(permissions.BasePermission):

    message = ""

    def has_permission(self, request, view):                                                        
        if some_condetion:
            self.message = "some message"
            return False                   
        else:
            self.message = "other message"
            return True

http://www.django-rest-framework.org/api-guide/permissions/#custom-permissions