Ruby on Railsframework~30 mins

Environment configuration files in Ruby on Rails - Mini Project: Build & Apply

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Environment Configuration Files in Rails

📖 Scenario: You are building a Rails web application that needs to behave differently in development and production. For example, you want to set a custom greeting message that changes based on the environment.

🎯 Goal: Create environment configuration files in a Rails app to store a greeting message. Then, access this message in the application code to display the correct greeting depending on the environment.

📋 What You'll Learn

Create a configuration file for the development environment with a greeting message

Create a configuration file for the production environment with a different greeting message

Add a configuration variable to access the greeting message

Use the configuration variable in a Rails controller to display the greeting

💡 Why This Matters

🌍 Real World

Rails apps often need different settings for development, testing, and production environments to behave correctly and securely.

💼 Career

Understanding environment configuration is essential for Rails developers to manage app behavior and deployment safely and efficiently.

Progress0 / 4 steps

Create development environment configuration file

Create a file named config/environments/development.rb and add a line to set config.greeting = 'Hello from Development!' inside the Rails.application.configure do ... end block.

Ruby on Rails

# Create config/environments/development.rb with greeting configuration
Rails.application.configure do
  # Your code here
end

Need a hint?

Remember to put the greeting inside the Rails.application.configure do ... end block.

Create production environment configuration file

Create a file named config/environments/production.rb and add a line to set config.greeting = 'Welcome to Production!' inside the Rails.application.configure do ... end block.

Ruby on Rails

Rails.application.configure do
  config.greeting = 'Hello from Development!'
end

# Create config/environments/production.rb with greeting configuration
Rails.application.configure do
  # Your code here
end

Need a hint?

Use the same structure as development.rb but with the production greeting.

Add configuration access in application controller

In app/controllers/application_controller.rb, add a method named greeting_message that returns Rails.configuration.greeting.

Ruby on Rails

Rails.application.configure do
  config.greeting = 'Hello from Development!'
end

Rails.application.configure do
  config.greeting = 'Welcome to Production!'
end

class ApplicationController < ActionController::Base
  # Your code here
end

Need a hint?

Define a method that returns the greeting from Rails.configuration.

Use greeting message in a view

In app/views/layouts/application.html.erb, add a line inside the <body> tag to display the greeting message by calling greeting_message.

Ruby on Rails

Rails.application.configure do
  config.greeting = 'Hello from Development!'
end

Rails.application.configure do
  config.greeting = 'Welcome to Production!'
end

class ApplicationController 


  MyApp

Need a hint?

Use ERB tags to call the greeting_message method inside the body.