Login view and template in Django - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Django login view.

Django

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

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

ALoginView

BSignupView

CPasswordResetView

DLogoutView

Attempts:

3 left

💡 Hint

Common Mistakes

Importing LogoutView instead of LoginView

Using SignupView which is not built-in

Confusing PasswordResetView with LoginView

The LoginView is the built-in Django view to handle user login.

2fill in blank

medium

Complete the code to define a URL pattern for the login view.

Django

path('login/', [1].as_view(), name='login')

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

ASignupView

BLogoutView

CLoginView

DPasswordResetView

Attempts:

3 left

💡 Hint

Common Mistakes

Using LogoutView instead of LoginView

Forgetting to call as_view()

Using a view not related to login

The URL pattern should use LoginView.as_view() to connect the login page.

3fill in blank

hard

Fix the error in the login template to correctly display the username input field.

Django

<input type="text" name="[1]" placeholder="Username">

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

Ausername

Bemail

Cuser

Dlogin

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'email' instead of 'username' without custom backend

Using 'user' which is not recognized

Using 'login' which is not a valid field name

The login form expects the input field name to be username for authentication.

4fill in blank

hard

Fill both blanks to complete the login template form with CSRF token and password input.

Django

<form method="post">
  {% csrf_token %}
  <input type="text" name="username" placeholder="Username">
  <input type="[1]" name="password" placeholder="Password">
  <button type="[2]">Log In</button>
</form>

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

Asubmit

Bpassword

Cbutton

Dtext

Attempts:

3 left

💡 Hint

Common Mistakes

Using input type 'text' for password

Using button type 'button' which does not submit the form

The password input type must be password to hide characters, and the button type should be submit to send the form.

5fill in blank

hard

Fill all three blanks to customize the login view with a template and redirect URL.

Django

class CustomLoginView(LoginView):
    template_name = '[1]'
    redirect_authenticated_user = [2]
    next_page = '[3]'

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

Alogin.html

BTrue

C/dashboard/

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect template file name

Setting redirect_authenticated_user to False

Leaving next_page empty or incorrect

Set template_name to the login template file, redirect_authenticated_user to True to redirect logged-in users, and next_page to the URL to redirect after login.

Practice

1. What is the main purpose of Django's LoginView?

easy

A. To display a list of logged-in users

B. To create a new user registration form

C. To handle password reset requests

D. To provide a ready-made view for user login handling

Solution

1. Step 1: Understand Django's built-in views

   Django provides LoginView as a built-in class-based view to handle user login functionality easily.

2. Step 2: Identify the purpose of LoginView

   It manages displaying the login form, validating user credentials, and logging users in.

3. Final Answer:

   To provide a ready-made view for user login handling -> Option D

4. Quick Check:

   LoginView = ready-made login handler [OK]

Hint: LoginView is for login pages, not registration or reset [OK]

Common Mistakes:

• Confusing LoginView with registration or password reset views
• Thinking LoginView lists users
• Assuming LoginView creates new users

2. Which of the following is the correct way to specify a custom template for Django's LoginView?

easy

A. template = 'login.html'

B. template_name = 'login.html'

C. templateFile = 'login.html'

D. templatePath = 'login.html'

Solution

1. Step 1: Recall Django's class-based view attribute for templates

   Django's class-based views use the attribute template_name to specify the HTML template file.

2. Step 2: Match the correct attribute name

   Among the options, only template_name is the correct attribute to set the template.

3. Final Answer:

   template_name = 'login.html' -> Option B

4. Quick Check:

   Use template_name to set template in CBVs [OK]

Hint: Remember: class-based views use template_name, not template [OK]

Common Mistakes:

• Using 'template' instead of 'template_name'
• Using camelCase like 'templateFile' or 'templatePath'
• Forgetting to set template_name at all

3. Given this simple login template snippet:

<form method="post">
  {% csrf_token %}
  {{ form.as_p }}
  <button type="submit">Login</button>
</form>

What will happen if the {% csrf_token %} tag is removed?

medium

A. The form will submit successfully without any issues

B. The form will submit but the user will not be logged in

C. Django will raise a CSRF verification failed error on form submission

D. The form will redirect to the homepage automatically

Solution

1. Step 1: Understand CSRF protection in Django forms

   Django requires a CSRF token in POST forms to protect against cross-site request forgery attacks.

2. Step 2: Effect of removing the CSRF token

   If the {% csrf_token %} tag is missing, Django will reject the POST request with a CSRF verification error.

3. Final Answer:

   Django will raise a CSRF verification failed error on form submission -> Option C

4. Quick Check:

   Missing csrf_token causes CSRF error [OK]

Hint: Always include {% csrf_token %} in POST forms [OK]

Common Mistakes:

• Assuming form submits without CSRF token
• Thinking user won't log in but no error occurs
• Believing form redirects automatically without token

4. You wrote this URL pattern for login:

path('login/', LoginView.as_view(template_name='login.html'))

But when you visit /login/, you get a TemplateDoesNotExist error. What is the most likely cause?

medium

A. The template file 'login.html' is missing or not in the correct templates directory

B. You forgot to import LoginView from django.contrib.auth.views

C. You need to add a trailing slash in the URL pattern

D. The URL pattern should be named 'login_view' instead of 'login/'

Solution

1. Step 1: Understand TemplateDoesNotExist error

   This error means Django cannot find the specified template file in any of the configured template directories.

2. Step 2: Check common causes

   Since the URL pattern and import are likely correct, the most common cause is the missing or misplaced template file.

3. Final Answer:

   The template file 'login.html' is missing or not in the correct templates directory -> Option A

4. Quick Check:

   TemplateDoesNotExist = missing or misplaced template [OK]

Hint: Check template file location if TemplateDoesNotExist error appears [OK]

Common Mistakes:

• Assuming import errors cause TemplateDoesNotExist
• Thinking URL pattern naming affects template loading
• Ignoring template directory settings

5. You want to customize the login form to add a 'Remember Me' checkbox that keeps users logged in longer. Which approach correctly integrates this feature using Django's LoginView?

hard

A. Override LoginView to add a custom form with a 'remember_me' field and adjust session expiry in form_valid

B. Add a checkbox in the template only; Django handles session duration automatically

C. Set template_name to a new template with the checkbox but do not change the view or form

D. Use Django's default LoginView without changes; 'Remember Me' is built-in

Solution

1. Step 1: Understand customizing LoginView

   To add new fields like 'Remember Me', you must create a custom form and override LoginView to use it.

2. Step 2: Adjust session expiry based on 'remember_me'

   Override form_valid method to set session expiry longer if 'remember_me' is checked.

3. Final Answer:

   Override LoginView to add a custom form with a 'remember_me' field and adjust session expiry in form_valid -> Option A

4. Quick Check:

   Custom form + override form_valid for 'Remember Me' [OK]

Hint: Customize form and override form_valid to handle 'Remember Me' [OK]

Common Mistakes:

• Adding checkbox only in template without backend logic
• Assuming default LoginView supports 'Remember Me' automatically
• Not overriding form_valid to change session expiry