login_required decorator in Django - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the login_required decorator in Django?

The login_required decorator ensures that a user must be logged in to access a particular view. If the user is not logged in, they are redirected to the login page.

beginner

How do you apply the login_required decorator to a Django view function?

You import it with <code>from django.contrib.auth.decorators import login_required</code> and then place <code>@login_required</code> above the view function definition.

beginner

What happens if an anonymous user tries to access a view decorated with login_required?

They are redirected to the login page, usually with a query parameter ?next= that stores the original page they wanted to visit.

intermediate

Can login_required be used with class-based views in Django?

Yes, but you need to use the LoginRequiredMixin from django.contrib.auth.mixins instead of the decorator.

intermediate

How can you customize the URL where users are redirected if they are not logged in when using login_required?

You can set the LOGIN_URL setting in your Django settings file to the desired login page URL.

What does the login_required decorator do in Django?

A Prevents logged-in users from accessing a view

B Logs out the user automatically

C Redirects users to the homepage

D Allows only logged-in users to access a view

The login_required decorator restricts access to a view so only logged-in users can see it.

Where do you import login_required from in Django?

A django.shortcuts

B django.views.decorators

C django.contrib.auth.decorators

D django.http

You import login_required from django.contrib.auth.decorators.

What parameter is added to the URL when an anonymous user is redirected to login by login_required?

A ?redirect=

B ?next=

C ?login=

D ?user=

The ?next= parameter stores the original page URL to redirect after login.

Which mixin is used to require login for class-based views in Django?

A LoginRequiredMixin

B AuthenticationRequiredMixin

C UserRequiredMixin

D AccessRequiredMixin

The LoginRequiredMixin is used with class-based views to enforce login.

How do you change the default login redirect URL for login_required?

A Set <code>LOGIN_URL</code> in settings

B Set <code>LOGIN_REDIRECT_URL</code> in settings

C Pass a parameter to the decorator

D Change the view name

You set LOGIN_URL in your Django settings to customize the login page URL.

Explain how the login_required decorator works in Django and what happens when an anonymous user tries to access a protected view.

Think about what happens behind the scenes when a user is not logged in.

Describe how to protect both function-based and class-based views in Django using login requirements.

Remember the difference in syntax between function and class views.