1. What is Ruby on Rails?
Ruby on Rails, also known as Rails, is an open-source web development framework built using the Ruby programming language.
2. What are the advantages of using Ruby on Rails?
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- Increased developer productivity due to its convention over configuration principle.
- Strong emphasis on code readability and simplicity.
- Extensive library ecosystem for rapid development.
- Built-in testing framework for efficient and effective testing.
- Active community support and continuous updates.
3. Explain the MVC architecture in Rails.
Ruby on Rails follows the Model-View-Controller (MVC) architectural pattern. The model represents the data and business logic, the view handles the user interface, and the controller manages the flow between the model and view.
4. How does Rails handle database connectivity?
Rails uses the Object-Relational Mapping (ORM) tool called ActiveRecord to establish database connectivity. ActiveRecord simplifies database operations by providing abstraction and handling the mapping of database tables to Ruby objects.
5. What is a migration in Rails?
A migration is a way to manage changes to the database schema. It allows developers to modify the database structure without directly writing SQL queries. Migrations can add, modify, or delete database tables, columns, or indexes.
6. Explain the concept of scaffolding in Rails.
Scaffolding is a code generation tool in Rails that automatically creates a set of Model, View, and Controller files. It provides a basic CRUD (Create, Read, Update, Delete) functionality for a given resource, allowing developers to quickly prototype and build simple applications.
7. How does Rails handle routing?
Rails uses a routing file called routes.rb to handle URL routing. It maps incoming URLs to the appropriate controller actions, allowing developers to define custom routes and handle various HTTP verbs like GET, POST, PUT, and DELETE.
8. What is ActiveRecord in Rails?
ActiveRecord is the Object-Relational Mapping (ORM) layer that handles database operations in Rails. It allows developers to perform database queries, create, update, and delete records using Ruby code instead of writing raw SQL queries.
9. How does Rails handle validations?
Rails provides a built-in validation framework that enables developers to define rules for data integrity. By adding validation rules to model classes, Rails automatically validates the data before saving it to the database, ensuring data consistency and preventing invalid data from being persisted.
10. What are Gems in Rails?
Gems are packages or libraries in Ruby that can be easily added to a Rails application to extend its functionality. Gems are managed by Bundler, a dependency management tool, and can be installed from various sources like RubyGems or GitHub.
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