Ruby on Rails Ruby on Rails MVC Architecture & Routing 1 — Questions and Answers
Question 1: In Rails MVC, which layer is responsible for handling HTTP requests and coordinating between the Model and View?
- Model
- View
- Controller (Correct answer)
- Router
Correct answer: Controller
The Controller receives HTTP requests, interacts with the Model for data, and passes that data to the View for rendering.
Question 2: Which Rails file defines the mapping between URLs and controller actions?
- application.rb
- routes.rb (Correct answer)
- schema.rb
- config.rb
Correct answer: routes.rb
config/routes.rb is where you define URL patterns and their corresponding controller#action mappings.
Question 3: What does the Rails helper `resources :articles` generate in routes.rb?
- Only GET routes for articles
- Only CRUD routes for index and show
- Seven RESTful routes for the articles resource (Correct answer)
- A single named route for articles
Correct answer: Seven RESTful routes for the articles resource
`resources :articles` generates all seven standard RESTful routes: index, show, new, create, edit, update, and destroy.
Question 4: In Rails, where do you place shared application layout files that wrap all views?
- app/views/shared/
- app/layouts/
- app/views/layouts/ (Correct answer)
- app/templates/
Correct answer: app/views/layouts/
Application layout files (e.g., application.html.erb) are stored in app/views/layouts/ and wrap the rendered view content.
Question 5: Which method in a Rails controller renders a specific view template explicitly?
- show
- display
- render (Correct answer)
- present
Correct answer: render
The `render` method explicitly specifies which template to render, overriding Rails' default convention-based rendering.
Question 6: What is the purpose of `before_action` in a Rails controller?
- To define a route before an action
- To run a method before specified controller actions execute (Correct answer)
- To validate model data before saving
- To preload assets before rendering
Correct answer: To run a method before specified controller actions execute
`before_action` registers a callback that runs before one or more controller actions, commonly used for authentication.
Ruby on Rails Ruby on Rails MVC Architecture & Routing 1
In Rails MVC, which layer is responsible for handling HTTP requests and coordinating between the Model and View?