Named routes and path helpers in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to generate the path for the home page using a named route helper.

Ruby on Rails

root_path = [1]

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

Ahome_path

Broot_path

Cindex_path

Dmain_path

Attempts:

3 left

💡 Hint

Common Mistakes

Using a route helper that does not exist like home_path if not defined.

Confusing URL helpers with path helpers.

The root_path helper generates the path for the root route defined in Rails routes.

2fill in blank

medium

Complete the code to generate the path for showing a user with id 5 using a named route helper.

Ruby on Rails

user_show_path = user_[1]_path(5)

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

Aindex

Bnew

Cedit

Dshow

Attempts:

3 left

💡 Hint

Common Mistakes

Using edit or new which are for different actions.

Using index which lists all users.

The user_show_path is not a standard Rails helper. The correct helper is user_path(5) for showing a user. But since the blank is inside the helper name, the correct part is show to complete user_show_path.

3fill in blank

hard

Fix the error in the code to generate the edit path for a post with id 10.

Ruby on Rails

edit_post_[1](10)

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

Apath

Burl

Clink

Droute

Attempts:

3 left

💡 Hint

Common Mistakes

Using edit_post_url when only path is needed.

Using edit_post_link which is not a helper.

The correct helper for editing a post is edit_post_path(10). Using url or others will cause errors or unexpected output.

4fill in blank

hard

Fill both blanks to generate the path for deleting a comment with id 7.

Ruby on Rails

delete_[1]_[2](7)

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

Acomment

Bpost

Cpath

Durl

Attempts:

3 left

💡 Hint

Common Mistakes

Using post instead of comment for the resource.

Using url when path is expected.

The correct helper for deleting a comment is delete_comment_path(7). This generates the path for the delete action on the comment resource.

5fill in blank

hard

Fill all three blanks to generate the path for creating a new article.

Ruby on Rails

[1]_[2]_[3]

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

Anew

Barticle

Cpath

Dedit

Attempts:

3 left

💡 Hint

Common Mistakes

Using edit instead of new.

Using plural resource names like articles.

The helper for the new article form is new_article_path. This helper generates the path to the form for creating a new article.

Practice

1. What is the main purpose of named routes in Rails?

easy

A. To automatically generate database tables

B. To style HTML elements with CSS

C. To give easy-to-use names for URLs in the app

D. To handle user authentication

Solution

1. Step 1: Understand named routes concept

   Named routes assign simple names to URL patterns in Rails routes file.

2. Step 2: Identify their purpose

   These names help generate URL or path helpers for cleaner, readable code.

3. Final Answer:

   To give easy-to-use names for URLs in the app -> Option C

4. Quick Check:

   Named routes = URL names [OK]

Hint: Named routes = easy URL names for helpers [OK]

Common Mistakes:

• Confusing named routes with database features
• Thinking named routes style HTML
• Mixing named routes with authentication

2. Which syntax correctly defines a named route for a 'profile' page in config/routes.rb?

easy

A. get '/profile', to: 'users#show', as: 'profile'

B. route '/profile' => 'users#show', name: 'profile'

C. get '/profile' => 'users#show', named: 'profile'

D. path '/profile', controller: 'users', action: 'show', alias: 'profile'

Solution

1. Step 1: Recall correct named route syntax

   Rails uses get '/url', to: 'controller#action', as: 'name' format.

2. Step 2: Match options to syntax

   get '/profile', to: 'users#show', as: 'profile' matches this exactly; others use invalid keywords.

3. Final Answer:

   get '/profile', to: 'users#show', as: 'profile' -> Option A

4. Quick Check:

   Correct named route syntax = get '/profile', to: 'users#show', as: 'profile' [OK]

Hint: Use 'get', 'to:', and 'as:' for named routes [OK]

Common Mistakes:

• Using wrong keywords like 'route' or 'named'
• Mixing hash rocket and symbol syntax incorrectly
• Forgetting 'as:' for naming the route

3. Given this route: get '/dashboard', to: 'home#dashboard', as: 'dashboard', what does dashboard_path return?

medium

A. '/dashboard_path'

B. '/home/dashboard'

C. 'dashboard_url'

D. '/dashboard'

Solution

1. Step 1: Understand named route helper

   The named route 'dashboard' creates dashboard_path helper returning the URL path string.

2. Step 2: Match helper output

   Since route is '/dashboard', dashboard_path returns '/dashboard'.

3. Final Answer:

   '/dashboard' -> Option D

4. Quick Check:

   dashboard_path = '/dashboard' [OK]

Hint: Named route 'foo' creates 'foo_path' returning URL path [OK]

Common Mistakes:

• Confusing _path with _url helpers
• Expecting controller/action strings
• Adding extra suffixes like '_path' in output

4. Identify the error in this route definition: get '/items', to: 'items#index', as: items_path

medium

A. The HTTP verb 'get' is incorrect here

B. The named route should be a symbol or string, not a method call

C. The controller action 'items#index' is invalid syntax

D. The URL path '/items' must not start with a slash

Solution

1. Step 1: Check named route naming

   The as: option expects a symbol or string name, not a method call like items_path.

2. Step 2: Identify correct usage

   It should be as: :items or as: 'items' to create items_path helper.

3. Final Answer:

   The named route should be a symbol or string, not a method call -> Option B

4. Quick Check:

   Use symbol/string for 'as:' [OK]

Hint: Use symbol/string for 'as:', not helper method call [OK]

Common Mistakes:

• Passing helper method name instead of symbol/string
• Misunderstanding 'as:' purpose
• Thinking HTTP verb or path is wrong here

5. You want to create a named route for editing a user profile with URL /users/:id/edit. Which route definition and helper usage is correct?

hard

A. Route: get '/users/:id/edit', to: 'users#edit', as: 'edit_user'; Helper: edit_user_path(5)

B. Route: get '/users/edit/:id', to: 'users#edit', as: 'edit_user'; Helper: edit_user_path(5)

C. Route: get '/users/:id/edit', to: 'users#edit', as: :edit_user; Helper: edit_user_url

D. Route: get '/users/edit/:id', to: 'users#edit', as: :edit_user; Helper: edit_user_path

Solution

1. Step 1: Confirm correct URL pattern

   The edit user URL is conventionally '/users/:id/edit'.

2. Step 2: Check named route and helper usage

   Route: get '/users/:id/edit', to: 'users#edit', as: 'edit_user'; Helper: edit_user_path(5) uses string for 'as:' and calls edit_user_path(5) which is correct. Route: get '/users/:id/edit', to: 'users#edit', as: :edit_user; Helper: edit_user_url uses symbol but calls edit_user_url without argument, which is incomplete.

3. Final Answer:

   Route: get '/users/:id/edit', to: 'users#edit', as: 'edit_user'; Helper: edit_user_path(5) -> Option A

4. Quick Check:

   Correct path + named route + helper call = Route: get '/users/:id/edit', to: 'users#edit', as: 'edit_user'; Helper: edit_user_path(5) [OK]

Hint: Use '/users/:id/edit' and call edit_user_path(id) [OK]

Common Mistakes:

• Swapping :id and 'edit' in URL path
• Using _url helper without required id argument
• Using symbol/string inconsistently for 'as:'