Page and action caching in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enable page caching for the 'index' action in a Rails controller.

Ruby on Rails

class ProductsController < ApplicationController
  [1] :index

  def index
    @products = Product.all
  end
end

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

Acache_page

Bcache_pages

Ccaches_page

Dpage_cache

Attempts:

3 left

💡 Hint

Common Mistakes

Using singular 'cache_page' instead of 'caches_page'.

Using non-existent methods like 'page_cache'.

The method caches_page enables page caching for the specified action in Rails controllers.

2fill in blank

medium

Complete the code to enable action caching for the 'show' action in a Rails controller.

Ruby on Rails

class ArticlesController < ApplicationController
  [1] :show

  def show
    @article = Article.find(params[:id])
  end
end

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

Acaches_action

Bcache_action

Caction_cache

Dcaches_actions

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'cache_action' instead of 'caches_action'.

Using plural 'caches_actions' which is incorrect.

The method caches_action enables action caching for the specified controller action.

3fill in blank

hard

Fix the error in the code to expire the cached page for the 'home' action.

Ruby on Rails

class HomeController < ApplicationController
  def expire_cache
    [1]('/home')
  end
end

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

Aremove_page

Bexpire_page

Cclear_cache

Dexpire_action

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'expire_action' which is for action caching, not page caching.

Using non-existent methods like 'clear_cache'.

The method expire_page is used to remove a cached page in Rails.

4fill in blank

hard

Fill both blanks to expire the cached action for 'show' with id parameter.

Ruby on Rails

class ProductsController < ApplicationController
  def expire_show_cache
    [1](action: 'show', id: [2])
  end
end

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

Aexpire_action

Bparams[:id]

Crequest[:id]

Dexpire_page

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'expire_page' instead of 'expire_action' for action cache.

Using 'request[:id]' which is incorrect syntax.

Use expire_action to expire action cache and params[:id] to get the id parameter.

5fill in blank

hard

Fill all three blanks to cache the 'index' action with a condition to skip caching if user is logged in.

Ruby on Rails

class PostsController < ApplicationController
  [1] :index, if: -> { ![2] }

  private

  def [3]
    current_user.present?
  end
end

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

Acaches_action

Buser_logged_in?

Clogged_in?

Duser_signed_in?

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'caches_page' instead of 'caches_action'.

Mismatch between method name and condition method.

Use caches_action to cache the action, and a method like user_logged_in? to check login status.