Can you explain the purpose and principle of operation of the LoginRequiredMixin in Django?

LoginRequiredMixin is a mixin from Django used to restrict access to class-based views only to authenticated users.

How it works:

• When attempting to access the view, it checks whether the user is authenticated.
• If the user is not logged in, it redirects to the login page.
• If the user is authenticated, access to the view is granted.

Example of usage:

from django.contrib.auth.mixins import LoginRequiredMixin
from django.views.generic import TemplateView

class MyView(LoginRequiredMixin, TemplateView):
    template_name = 'my_template.html'

Thus, LoginRequiredMixin simplifies protecting views from unauthorized access without the need to write additional check code.