Redirects with redirect function in Django - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What does this Django view return?

Consider this Django view function using the redirect function. What will the user see after accessing this view?

Django

from django.shortcuts import redirect

def my_view(request):
    return redirect('home')

A The view raises a NameError because 'home' is not defined.

B The user sees a page with the text 'home'.

C The user is redirected to the URL mapped to the name 'home'.

D The user sees a 404 error page.

💡 Hint

Think about what the redirect function does with a string argument.

The redirect function takes a URL name and sends the user to that URL. It does not render text or raise an error if the URL name exists.

📝 Syntax

intermediate

Which option correctly uses the redirect function to send to a URL path?

You want to redirect the user to the URL path '/dashboard/'. Which code snippet correctly does this?

A return redirect('dashboard')

B return redirect(path='/dashboard/')

C return redirect(url='/dashboard/')

D return redirect('/dashboard/')

💡 Hint

The redirect function can take a URL path as a string directly.

Passing '/dashboard/' as a string to redirect sends the user to that exact URL path. The other options either misuse parameters or treat the string as a URL name.

🔧 Debug

advanced

Why does this redirect cause an error?

This Django view tries to redirect using a variable but causes an error. Why?

def my_view(request):
    url_name = home
    return redirect(url_name)

Django

def my_view(request):
    url_name = home
    return redirect(url_name)

A NameError because 'home' is not defined as a variable or string.

B TypeError because redirect expects a string but got a variable.

C No error, it redirects correctly to 'home'.

D ValueError because 'home' is not a valid URL.

💡 Hint

Look at how the variable url_name is assigned.

The code assigns url_name = home without quotes, so Python looks for a variable named home which is not defined, causing a NameError.

❓ state_output

advanced

What is the HTTP status code of this redirect response?

Given this Django view, what HTTP status code will the redirect response have?

from django.shortcuts import redirect

def my_view(request):
    return redirect('login')

Django

from django.shortcuts import redirect

def my_view(request):
    return redirect('login')

A 302 Found (temporary redirect)

B 301 Moved Permanently

C 404 Not Found

D 200 OK

💡 Hint

By default, redirect sends a temporary redirect status.

Django's redirect function returns an HttpResponseRedirect with status code 302 by default, indicating a temporary redirect.

🧠 Conceptual

expert

Which redirect usage correctly passes URL parameters?

You want to redirect to a URL named 'profile' that requires a username parameter. Which option correctly passes the parameter using Django's redirect function?

A return redirect('profile', {'username': 'alice'})

B return redirect('profile', username='alice')

C return redirect('profile?username=alice')

D return redirect('profile/username/alice')

💡 Hint

Use keyword arguments to pass URL parameters to redirect.

The redirect function accepts the URL name and keyword arguments for URL parameters. Option B correctly uses this pattern.

Practice

1. What does the Django redirect function do in a view?

easy

A. It saves data to the database before showing a page.

B. It sends the user to a different URL or view automatically.

C. It stops the server from responding to the request.

D. It renders a template without changing the URL.

Solution

1. Step 1: Understand the purpose of redirect

   The redirect function is used to send users to another page automatically, changing the URL in the browser.

2. Step 2: Compare with other options

   Rendering a template does not change the URL, stopping the server or saving data are unrelated to redirect.

3. Final Answer:

   It sends the user to a different URL or view automatically. -> Option B

4. Quick Check:

   Redirect = automatic URL change [OK]

Hint: Redirect changes URL and sends user to another page [OK]

Common Mistakes:

• Confusing redirect with render which does not change URL
• Thinking redirect saves data automatically
• Assuming redirect stops server response

2. Which of the following is the correct way to use redirect to send a user to a URL path '/home/'?

easy

A. redirect('/home/')

B. return redirect url('/home/')

C. return redirect('/home/')

D. return redirect('/home')()

Solution

1. Step 1: Check the syntax of redirect usage

   The redirect function must be returned from the view with the URL path as a string argument.

2. Step 2: Identify correct syntax

   Only return redirect('/home/') correctly calls redirect and returns the response.

3. Final Answer:

   return redirect('/home/') -> Option C

4. Quick Check:

   Use return with redirect and URL string [OK]

Hint: Always use return with redirect and pass URL as string [OK]

Common Mistakes:

• Forgetting to return the redirect response
• Calling redirect without return
• Adding extra parentheses or wrong syntax

3. What will happen when this Django view runs?

from django.shortcuts import redirect

def my_view(request):
    return redirect('home')

Assuming 'home' is a valid URL pattern name.

medium

A. The user will be redirected to the URL linked to the 'home' view name.

B. The view will raise an error because 'home' is not a URL path.

C. The view will render a template named 'home'.

D. Nothing happens; the redirect function does not work with names.

Solution

1. Step 1: Understand redirect with view name

   Redirect can accept a URL pattern name and will find the URL linked to that name.

2. Step 2: Confirm behavior

   Since 'home' is a valid URL name, redirect sends user to that URL automatically.

3. Final Answer:

   The user will be redirected to the URL linked to the 'home' view name. -> Option A

4. Quick Check:

   redirect('view_name') sends user to that URL [OK]

Hint: redirect accepts URL names, not just paths [OK]

Common Mistakes:

• Thinking redirect only works with URL paths
• Confusing redirect with render for templates
• Assuming redirect needs full URL string

4. Identify the error in this Django view using redirect:

from django.shortcuts import redirect

def go_home(request):
    redirect('/home/')

medium

A. Missing return statement before redirect call.

B. Redirect function does not accept string paths.

C. The URL path should not start with a slash.

D. The import statement is incorrect.

Solution

1. Step 1: Check the redirect usage in the view

   The redirect function must be returned to send the HTTP response properly.

2. Step 2: Identify missing return

   Here, redirect is called but not returned, so the view returns None and does not redirect.

3. Final Answer:

   Missing return statement before redirect call. -> Option A

4. Quick Check:

   Always return redirect response [OK]

Hint: Always return redirect, don't just call it [OK]

Common Mistakes:

• Calling redirect without return
• Thinking redirect needs special URL format
• Incorrect import statements

5. You want to redirect a user to a detail page of a model instance post in Django. Which is the correct way to use redirect?

hard

A. return redirect('/post/' + post.id)

B. return redirect('post_detail', id=post.id)

C. return redirect(post)

D. return redirect('post_detail', pk=post.id)

Solution

1. Step 1: Understand redirect with model instance and URL parameters

   Redirect can accept a view name with keyword arguments matching URL parameters.

2. Step 2: Analyze options

   return redirect(post) passes the model instance directly, which works only if the model has a get_absolute_url method. return redirect('post_detail', id=post.id) uses incorrect keyword 'id'; typical patterns use 'pk', causing NoReverseMatch. return redirect('post_detail', pk=post.id) correctly passes the view name and keyword argument 'pk' matching typical URL patterns. return redirect('/post/' + post.id) tries to concatenate string and int without conversion, causing error.

3. Final Answer:

   return redirect('post_detail', pk=post.id) -> Option D

4. Quick Check:

   Use redirect with view name and keyword args [OK]

Hint: Use redirect with view name and keyword args for model pages [OK]

Common Mistakes:

• Passing model instance without get_absolute_url method
• Using incorrect keyword arg name like 'id' instead of 'pk'
• Concatenating string and int without conversion