Reverse URL resolution with reverse in Django - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the function used for reverse URL resolution in Django.

Django

from django.urls import [1]

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

Apath

Breverse

Curl

Dinclude

Attempts:

3 left

💡 Hint

Common Mistakes

Importing 'path' instead of 'reverse'.

Trying to import 'url' which is deprecated.

The reverse function is imported from django.urls to perform reverse URL resolution.

2fill in blank

medium

Complete the code to reverse the URL named 'home'.

Django

url = reverse('[1]')

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

Ahome

Bindex

Cdashboard

Dmain

Attempts:

3 left

💡 Hint

Common Mistakes

Using a URL path instead of the URL name.

Misspelling the URL name.

The URL name given in the reverse function must match the name defined in your URL patterns. Here, it is 'home'.

3fill in blank

hard

Fix the error in reversing a URL that requires an argument 'pk'.

Django

url = reverse('detail', args=[[1]])

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

A1

Bpk

C'id'

Dobject

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the string 'pk' instead of a value.

Passing a variable name without quotes.

The args list must contain the actual value for the URL parameter, such as an integer like 1, not the variable name.

4fill in blank

hard

Fill both blanks to reverse a URL named 'profile' with a keyword argument 'username'.

Django

url = reverse('[1]', kwargs={{'[2]': 'john'}})

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

Aprofile

Buser

Cusername

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong URL name.

Using incorrect keyword argument key.

The first blank is the URL name 'profile'. The second blank is the keyword argument key 'username' matching the URL pattern.

5fill in blank

hard

Fill all three blanks to reverse a URL named 'article-detail' with keyword arguments 'year' and 'slug'.

Django

url = reverse('[1]', kwargs={{'[2]': 2024, '[3]': 'django-tutorial'}})

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

Aarticle-detail

Byear

Cslug

Ddate

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong URL name.

Using incorrect keys like 'date' instead of 'year'.

Swapping 'slug' and 'year' keys.

The URL name is 'article-detail'. The keyword arguments keys must match the URL parameters: 'year' and 'slug'.

Practice

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

easy

A. To get the URL path by using the URL's name

B. To reverse the order of characters in a string

C. To reverse the HTTP request method

D. To reverse the order of middleware execution

Solution

1. Step 1: Understand what reverse does

   The reverse function in Django is used to find the URL path by its name defined in URL patterns.

2. Step 2: Compare with other options

   Options A, B, and C describe unrelated actions like middleware order, string reversal, or HTTP method changes, which reverse does not do.

3. Final Answer:

   To get the URL path by using the URL's name -> Option A

4. Quick Check:

   reverse returns URL by name [OK]

Hint: Remember: reverse builds URLs from names, not strings [OK]

Common Mistakes:

• Thinking reverse reverses strings
• Confusing reverse with HTTP methods
• Assuming reverse changes middleware order

2. Which of the following is the correct way to import the reverse function in Django?

easy

A. from django.http import reverse

B. from django.urls import reverse

C. import reverse from django.urls

D. from django.shortcuts import reverse

Solution

1. Step 1: Recall the correct import path

   The reverse function is located in the django.urls module.

2. Step 2: Check syntax correctness

   from django.urls import reverse uses the correct Python import syntax and module. Options B and D import from wrong modules. import reverse from django.urls uses incorrect import syntax.

3. Final Answer:

   from django.urls import reverse -> Option B

4. Quick Check:

   reverse is in django.urls [OK]

Hint: Import reverse from django.urls, not other modules [OK]

Common Mistakes:

• Importing reverse from django.http
• Using wrong import syntax
• Importing from django.shortcuts

3. Given the URL pattern path('article//', views.detail, name='article-detail'), what will reverse('article-detail', args=[5]) return?

medium

A. /article/id/5/

B. /article//

C. /article/5/

D. /article/detail/5/

Solution

1. Step 1: Understand the URL pattern

   The pattern expects an integer parameter named id and the URL name is article-detail.

2. Step 2: Apply reverse with args

   Using reverse('article-detail', args=[5]) replaces with 5, producing /article/5/.

3. Final Answer:

   /article/5/ -> Option C

4. Quick Check:

   reverse fills URL params with args [OK]

Hint: Args list fills URL parameters in order [OK]

Common Mistakes:

• Including parameter names in URL output
• Using angle brackets literally in output
• Confusing URL name with view name

4. What is wrong with this code snippet?

from django.urls import reverse
url = reverse('profile', kwargs={'user_id': 10})

Given the URL pattern: path('user//', views.profile, name='profile')

medium

A. The keyword argument name should be 'id', not 'user_id'

B. reverse cannot use kwargs, only args

C. The URL name 'profile' is incorrect

D. reverse requires no arguments for this URL

Solution

1. Step 1: Check URL parameter name

   The URL pattern uses id as the parameter name, not user_id.

2. Step 2: Match kwargs keys with URL params

   When using kwargs, keys must exactly match parameter names in the URL pattern. Here, user_id is wrong.

3. Final Answer:

   The keyword argument name should be 'id', not 'user_id' -> Option A

4. Quick Check:

   kwargs keys must match URL params [OK]

Hint: Match kwargs keys exactly to URL parameter names [OK]

Common Mistakes:

• Using wrong parameter names in kwargs
• Thinking reverse can't use kwargs
• Assuming URL name is wrong without checking

5. You have these URL patterns:

path('blog//', views.post_detail, name='post-detail')
path('blog///', views.archive, name='blog-archive')

Which reverse call correctly builds the URL for a blog post with slug 'hello-world'?

hard

A. reverse('blog-archive', kwargs={'slug': 'hello-world'})

B. reverse('blog-archive', args=['hello-world'])

C. reverse('post-detail', args=['hello-world', 2023])

D. reverse('post-detail', kwargs={'slug': 'hello-world'})

Solution

1. Step 1: Identify the correct URL pattern for the slug

   The pattern named post-detail expects a slug parameter.

2. Step 2: Use reverse with correct kwargs

   To build the URL for slug 'hello-world', use reverse('post-detail', kwargs={'slug': 'hello-world'}). Using args is possible but kwargs is clearer here.

3. Step 3: Eliminate incorrect options

   Options B and D use the wrong URL name or wrong parameters. reverse('post-detail', args=['hello-world', 2023]) provides too many positional arguments for the single-parameter pattern.

4. Final Answer:

   reverse('post-detail', kwargs={'slug': 'hello-world'}) -> Option D

5. Quick Check:

   Use kwargs with named URL params [OK]

Hint: Use kwargs with named URL parameters for clarity [OK]

Common Mistakes:

• Using args instead of kwargs for named parameters
• Mixing URL names and parameters
• Passing wrong parameter types