Controller generation in Ruby on Rails - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of generating a controller in Rails?

A controller in Rails handles the incoming web requests, processes data, and sends responses back to the user, often by rendering views or redirecting.

beginner

Which Rails command generates a new controller named 'Articles' with actions 'index' and 'show'?

rails generate controller Articles index show

intermediate

What files are created when you generate a controller in Rails?

Rails creates a controller file (e.g., articles_controller.rb), view folders for each action, a helper file, and test files. Routes are not updated automatically.

intermediate

How does Rails connect a controller action to a URL?

Rails uses routes defined in config/routes.rb to map URLs to controller actions, so when a user visits a URL, the matching controller action runs.

beginner

True or False: Generating a controller automatically creates database tables.

False. Controllers handle requests and responses but do not create or modify database tables; that is done by models and migrations.

Which command creates a new controller named 'Users' with an 'edit' action?

A rails generate controller Users edit

B rails new controller Users edit

C rails create controller Users edit

D rails make controller Users edit

The correct syntax to generate a controller with actions is 'rails generate controller ControllerName action1 action2'.

What file does Rails create to define controller actions?

A app/views/controller_name/index.html.erb

B app/models/controller_name.rb

C config/routes.rb

D app/controllers/controller_name_controller.rb

Controller actions are defined inside the controller file located in app/controllers.

Which folder contains the views for a controller's actions?

A app/controllers/controller_name

B app/views/controller_name

C app/models/controller_name

D config/views/controller_name

Each controller has a corresponding folder inside app/views where the views for its actions are stored.

Does generating a controller automatically add routes for its actions?

A No, routes must be added manually or by using resourceful routing.

B Yes, routes are always added automatically.

C Only if you specify the --routes option.

D Yes, but only for the index action.

Generating a controller does not add routes automatically; you must define routes in config/routes.rb.

What is the role of a controller action in Rails?

A To define database schema.

B To store data in the database.

C To process requests and prepare data for views or redirects.

D To style the webpage.

Controller actions handle requests, interact with models, and decide what response to send back.

Explain the steps and files involved when you generate a new controller in Rails.

Think about what happens behind the scenes when you run the generate command.

Describe how a Rails controller connects a user's URL request to the code that runs.

Consider the flow from URL to response.