Route definition in routes.rb in Ruby on Rails - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the routes.rb file in a Rails application?

The routes.rb file defines how URLs map to controller actions. It tells Rails what code to run when a user visits a specific web address.

beginner

How do you define a simple route that maps the URL /home to the index action of the home controller?

You write: <br>get '/home', to: 'home#index'<br>This means when someone visits /home, Rails runs the index method in the home controller.

intermediate

What does the resources :posts line do in routes.rb?

It creates all the standard routes for a resource named posts. This includes routes for showing, creating, editing, updating, and deleting posts automatically.

beginner

Explain the difference between get and post in route definitions.

get defines a route for retrieving data (like showing a page). post defines a route for sending data to the server (like submitting a form).

beginner

How can you set the root URL (homepage) of your Rails app in routes.rb?

Use the root method like this:<br>root 'welcome#index'<br>This means the homepage URL / runs the index action of the welcome controller.

What does this route do? get '/about', to: 'pages#about'

A Maps the URL /about to the about action in pages controller

B Creates a new page called about

C Deletes the about page

D Redirects /about to the home page

The route connects the URL /about to the about method inside the pages controller.

Which HTTP method is used to submit form data in Rails routes?

A post

B get

C put

D delete

post is used to send data to the server, like submitting forms.

What does resources :users generate?

A Only the show route for users

B A single route for creating users

C All standard RESTful routes for users

D No routes, just a placeholder

It creates all common routes like index, show, new, edit, create, update, and destroy for users.

How do you set the homepage route in Rails?

A start 'welcome#index'

B home 'welcome#index'

C get '/', to: 'welcome#index'

D root 'welcome#index'

The root method sets the homepage route.

Which file do you edit to define routes in a Rails app?

A application.rb

B routes.rb

C config.yml

D database.rb

Routes are defined in the config/routes.rb file.

Describe how you would create a route for a 'contact' page that shows a form using the 'pages' controller and 'contact' action.

Think about how to connect a URL to a controller action using get.

Explain what the resources method does in Rails routing and why it is useful.

It saves time by generating many routes for common actions.