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Ruby Rails App

Building a Rails App

Ruby Rails app creates full-stack web UIs with MVC.

Introduction to Ruby on Rails

Ruby on Rails, or Rails, is a web application framework written in Ruby. It follows the Model-View-Controller (MVC) architecture, making it easier to build and maintain complex web applications. Rails is known for its convention over configuration approach, which simplifies the development process.

Setting Up a New Rails Application

Before you start, ensure you have Ruby and Rails installed on your system. You can create a new Rails application using the following command:

Navigate to your app directory:

Understanding the Rails Directory Structure

When you generate a new Rails application, it comes with a predefined directory structure:

  • app/ - Contains the controllers, models, views, and assets.
  • config/ - Holds the configuration files for the application.
  • db/ - Contains database-related files.
  • public/ - Serves static files directly.
  • Gemfile - Specifies the gem dependencies for your application.

Generating a Controller

Controllers are responsible for managing the flow between the model and the view. You can generate a controller using the following command:

This command creates a HomeController with an index action and a corresponding view file.

Creating a Model

Models in Rails are used to interact with the database. To create a model, use:

This command generates a model Article with string and text fields. After creating the model, run the migration to update the database:

Building Views

Views in Rails are templates that generate HTML. They are located in the app/views directory. To display a list of articles, you can create an index.html.erb file in app/views/articles:

Connecting MVC Components

Now that you have a controller, model, and view, let's connect them. In the HomeController, fetch the articles:

This code retrieves all articles from the database and makes them available to the index view.

Conclusion

In this guide, we walked through the basics of setting up a Ruby on Rails app with MVC architecture. You learned how to create controllers, models, and views, and how to connect them to build a functional web application. As you continue to develop your Rails app, explore more features like routing, validations, and API integrations.

Examples

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