Nested routes in Ruby on Rails - Mini Project: Build & Apply

Nested Routes in Rails

📖 Scenario: You are building a simple blog application where each post can have many comments. You want to organize your routes so that comments are nested inside posts. This helps keep URLs clear and shows the relationship between posts and their comments.

🎯 Goal: Create nested routes in a Rails application so that comments are nested inside posts. This will generate URLs like /posts/:post_id/comments for comments related to a specific post.

📋 What You'll Learn

Create a resource route for posts

Create a nested resource route for comments inside posts

Use the Rails resources method for routing

Ensure the nested routes generate URLs with post_id as a parameter

💡 Why This Matters

🌍 Real World

Nested routes help organize URLs in web apps where one resource belongs to another, like comments belonging to posts.

💼 Career

Understanding nested routes is essential for Rails developers to build clear, maintainable URL structures and RESTful APIs.

1

Set up the posts resource route

In the config/routes.rb file, create a resource route for posts using resources :posts.

Ruby on Rails

# Add a resource route for posts
# Your code here

Need a hint?

Use resources :posts to create all standard routes for posts.

2

Add nested comments resource inside posts

Inside the resources :posts block, nest the comments resource by adding resources :comments indented inside.

Ruby on Rails

Rails.application.routes.draw do
  resources :posts do
    # Nest comments resource here
    # Your code here
  end
end

Need a hint?

Indent resources :comments inside the resources :posts do ... end block.

3

Verify nested routes generate correct URL helpers

Check that the nested routes generate URL helpers like post_comments_path(post) and post_comment_path(post, comment) by running rails routes in the terminal.

Ruby on Rails

# Run 'rails routes' in your terminal to see the nested routes
# Your code here

Need a hint?

Use the terminal command rails routes to confirm the nested routes exist.

4

Add a root route for the application

Add a root route that points to posts#index by adding root 'posts#index' at the bottom of the routes.rb file.

Ruby on Rails

Rails.application.routes.draw do
  resources :posts do
    resources :comments
  end
  # Add root route here
  # Your code here
end

Need a hint?

The root route sets the home page URL to show the posts index.