Bundle exec for isolated execution in Ruby - Mini Project: Build & Apply

Bundle exec for isolated execution

📖 Scenario: You are working on a Ruby project that uses gems (libraries) to add extra features. Sometimes, different projects need different versions of the same gem. To avoid conflicts, Ruby developers use bundle exec to run commands in an isolated environment where only the gems listed in the project's Gemfile are used.

🎯 Goal: You will create a simple Ruby script and a Gemfile to manage gem versions. Then, you will use bundle exec to run the script with the correct gem versions, ensuring isolated execution.

📋 What You'll Learn

Create a Gemfile with a specific gem and version

Create a Ruby script that uses the gem

Use bundle exec to run the Ruby script

Print output showing the gem version used

💡 Why This Matters

🌍 Real World

Many Ruby projects use Bundler to manage gem versions and dependencies. Using <code>bundle exec</code> ensures your code runs with the correct gems, avoiding conflicts.

💼 Career

Understanding Bundler and isolated execution is important for Ruby developers working on projects with multiple dependencies or when deploying applications.

1

Create a Gemfile with the colorize gem version 0.8.1

Create a file called Gemfile with the exact content:
source 'https://rubygems.org'
gem 'colorize', '0.8.1'

Ruby

# Create a Gemfile with source and gem 'colorize' version '0.8.1'
# Your code here

Need a hint?

The Gemfile tells Bundler which gems and versions to use.

2

Create a Ruby script color_test.rb that uses the colorize gem

Create a file called color_test.rb with these lines:
require 'colorize'
puts 'Hello, Bundler!'.colorize(:green)

Ruby

# Create color_test.rb with require and puts using colorize
# Your code here

Need a hint?

The script uses require 'colorize' to load the gem and prints colored text.

3

Install gems and set a variable to run the script with bundle exec

Run bundle install in your terminal to install gems. Then, create a variable called command and set it to the string 'bundle exec ruby color_test.rb'.

Ruby

# Set command variable to run script with bundle exec
# Your code here

Need a hint?

The command variable holds the exact command to run the script with Bundler's isolated environment.

4

Run the command and print the output

Use output = `#{command}` to run the command and capture the output. Then, print the output variable.

Ruby

# Run the command and print output
# Your code here

Need a hint?

Use backticks ` to run the command and capture its output, then print it.