Page and action caching in Ruby on Rails - Mini Project: Build & Apply

Page and Action Caching in Rails

📖 Scenario: You are building a simple blog application in Rails. To improve performance, you want to cache the homepage and the show page of posts so that users get faster responses.

🎯 Goal: Learn how to implement page caching for the homepage and action caching for the post show page in a Rails app.

📋 What You'll Learn

Create a controller with an index action for the homepage

Create a controller with a show action for posts

Set up page caching for the homepage

Set up action caching for the post show page

💡 Why This Matters

🌍 Real World

Caching pages and actions helps websites load faster by saving rendered content and reusing it for multiple users.

💼 Career

Understanding Rails caching is important for backend developers to optimize web app performance and reduce server load.

1

Create PostsController with index and show actions

Create a Rails controller called PostsController with two actions: index and show. The index action should assign @posts to Post.all. The show action should assign @post to Post.find(params[:id]).

Ruby on Rails

# Your code here

Need a hint?

Use class PostsController < ApplicationController and define index and show methods.

2

Enable page caching for the index action

Add page caching for the index action in PostsController by calling caches_page :index inside the controller class.

Ruby on Rails

class PostsController 
  # Add page caching for index action
  # Your code here

  def index
    @posts = Post.all
  end

  def show
    @post = Post.find(params[:id])
  end
end

Need a hint?

Use caches_page :index inside the controller class but outside any method.

3

Enable action caching for the show action

Add action caching for the show action in PostsController by calling caches_action :show inside the controller class.

Ruby on Rails

class PostsController 
  caches_page :index
  # Add action caching for show action
  # Your code here

  def index
    @posts = Post.all
  end

  def show
    @post = Post.find(params[:id])
  end
end

Need a hint?

Use caches_action :show inside the controller class but outside any method.

4

Add routes for posts index and show

In the config/routes.rb file, add resourceful routes for posts by writing resources :posts, only: [:index, :show].

Ruby on Rails

# Your code here

Need a hint?

Add resources :posts, only: [:index, :show] inside the Rails.application.routes.draw do ... end block.