login_required decorator in Django - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the login_required decorator from Django.

Django

from django.contrib.auth.decorators import [1]

Drag options to blanks, or click blank then click option'

Arequire_login

Blogin_required

Clogin_decorator

Dauth_required

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'require_login' instead of 'login_required'.

Trying to import from the wrong module.

The login_required decorator is imported from django.contrib.auth.decorators to restrict access to views.

2fill in blank

medium

Complete the code to apply the login_required decorator to a Django view function.

Django

@[1]
def dashboard(request):
    return render(request, 'dashboard.html')

Drag options to blanks, or click blank then click option'

Arequire_login

Buser_login

Cauth_required

Dlogin_required

Attempts:

3 left

💡 Hint

Common Mistakes

Using '@require_login' which is not a valid decorator.

Forgetting the '@' symbol before the decorator.

The @login_required decorator is used above the view function to restrict access to logged-in users only.

3fill in blank

hard

Fix the error in the code by completing the decorator usage correctly.

Django

from django.contrib.auth.decorators import login_required

@login_[1]
def profile(request):
    return render(request, 'profile.html')

Drag options to blanks, or click blank then click option'

Arequired

Brequire

Crequireds

Drequires

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'login_require' or 'login_requires' instead of 'login_required'.

Misspelling the decorator name.

The correct decorator name is login_required. The code must have @login_required exactly.

4fill in blank

hard

Fill both blanks to complete the code that redirects unauthorized users to a custom login page.

Django

@login_required(login_url='[1]')
def settings(request):
    return render(request, '[2]')

Drag options to blanks, or click blank then click option'

A/custom-login/

Bsettings.html

Clogin.html

D/accounts/login/

Attempts:

3 left

💡 Hint

Common Mistakes

Using the default login URL instead of a custom one.

Using the wrong template name.

The login_url parameter sets a custom login page URL. The view renders the 'settings.html' template.

5fill in blank

hard

Fill all three blanks to create a class-based view that requires login using the login_required decorator.

Django

from django.utils.decorators import method_decorator
from django.views import View

@method_decorator(login_required, name='[1]')
class AccountView(View):
    def [2](self, request):
        return render(request, '[3]')

Drag options to blanks, or click blank then click option'

Adispatch

Bget

Caccount.html

Dpost

Attempts:

3 left

💡 Hint

Common Mistakes

Applying the decorator to 'get' instead of 'dispatch'.

Using 'post' method without handling GET.

Using a wrong template name.

The login_required decorator is applied to the dispatch method to protect all HTTP methods. The view defines a get method rendering 'account.html'.

Practice

1. What is the main purpose of the @login_required decorator in Django?

easy

A. To restrict access to a view only to logged-in users

B. To automatically log out users after a timeout

C. To display a custom error message on login failure

D. To register a new user in the system

Solution

1. Step 1: Understand the role of @login_required

   This decorator is used to protect views so only authenticated users can access them.

2. Step 2: Compare options with the decorator's function

   Only To restrict access to a view only to logged-in users correctly describes restricting access to logged-in users.

3. Final Answer:

   To restrict access to a view only to logged-in users -> Option A

4. Quick Check:

   login_required restricts access = D [OK]

Hint: Remember: login_required means login needed to see page [OK]

Common Mistakes:

• Thinking it logs out users automatically
• Confusing it with user registration
• Assuming it shows error messages

2. Which of the following is the correct way to apply the @login_required decorator to a Django view function named dashboard?

easy

A. def login_required(dashboard):

B. @login_required\ndef dashboard(request):

C. dashboard = login_required(dashboard(request))

D. login_required @dashboard(request):

Solution

1. Step 1: Recall the syntax for decorators in Python

   Decorators are placed above the function with an @ symbol, like @login_required.

2. Step 2: Check which option uses this syntax correctly

   @login_required\ndef dashboard(request): correctly places @login_required above the function definition.

3. Final Answer:

   @login_required\ndef dashboard(request): -> Option B

4. Quick Check:

   Decorator syntax uses @ above function = A [OK]

Hint: Decorator always goes above function with @ [OK]

Common Mistakes:

• Trying to call decorator like a function without @
• Placing decorator after function definition
• Using invalid syntax like 'login_required @dashboard'

3. Given this Django view code snippet, what happens when an anonymous user tries to access /profile/?

@login_required
def profile(request):
    return HttpResponse('User Profile')

medium

A. The user is redirected to the login page

B. The user gets a 404 Not Found error

C. The user sees 'User Profile' page

D. The user sees a permission denied message

Solution

1. Step 1: Understand what @login_required does for anonymous users

   It redirects users who are not logged in to the login page.

2. Step 2: Match this behavior with the options

   The user is redirected to the login page correctly states the redirect to login page for anonymous users.

3. Final Answer:

   The user is redirected to the login page -> Option A

4. Quick Check:

   Anonymous user triggers redirect = C [OK]

Hint: Anonymous users get redirected, not error or content [OK]

Common Mistakes:

• Assuming anonymous users see the page content
• Thinking it returns 404 error
• Believing it shows permission denied instead of redirect

4. Identify the error in this Django view using @login_required:

from django.contrib.auth.decorators import login_required
from django.http import HttpResponse

@login_required()
def dashboard(request):
    return HttpResponse('Dashboard')

medium

A. Missing import for HttpResponse

B. Missing request parameter in function

C. Function name should be capitalized

D. Incorrect use of parentheses after @login_required

Solution

1. Step 1: Check the decorator usage syntax

   @login_required is used without parentheses unless passing arguments.

2. Step 2: Identify the incorrect parentheses usage

   Incorrect use of parentheses after @login_required points out the error of using @login_required() instead of @login_required.

3. Final Answer:

   Incorrect use of parentheses after @login_required -> Option D

4. Quick Check:

   Decorator without args has no () = B [OK]

Hint: Use @login_required without () unless arguments needed [OK]

Common Mistakes:

• Adding parentheses when not required
• Forgetting to import HttpResponse (not tested here)
• Changing function name case unnecessarily

5. You want to protect a class-based view DashboardView so only logged-in users can access it. Which is the correct way to apply login_required?

hard

A. Call login_required inside the dispatch method manually

B. Add @login_required above the class definition

C. Use LoginRequiredMixin as a parent class instead of login_required

D. Wrap the class with login_required(DashboardView) after defining it

Solution

1. Step 1: Recall how to protect class-based views in Django

   For class-based views, Django provides LoginRequiredMixin to enforce login.

2. Step 2: Evaluate the options for class-based view protection

   Use LoginRequiredMixin as a parent class instead of login_required correctly uses LoginRequiredMixin as a parent class, which is the standard pattern.

3. Final Answer:

   Use LoginRequiredMixin as a parent class instead of login_required -> Option C

4. Quick Check:

   Class views use mixins, not decorators = A [OK]

Hint: Use LoginRequiredMixin for class views, not @login_required [OK]

Common Mistakes:

• Trying to decorate class directly with @login_required
• Wrapping class after definition with login_required
• Manually calling login_required inside methods