How to Use Gemfile for Ruby Dependencies

The Gemfile specifies Ruby gem dependencies for projects using Bundler. Gemfiles ensure consistent gem versions across different environments, similar to requirements.txt for Python or package.json for Node.js.

Opening Gemfile

Plain text file named "Gemfile" (no extension). Open with any text editor.

Basic Gemfile Syntax

source 'https://rubygems.org'

gem 'rails', '~> 7.0.0'
gem 'sqlite3'
gem 'puma', '>= 5.0'

group :development do
gem 'listen', '~> 3.3'
end

Specify gem names and optional version constraints. Group gems by environment (development, test, production).

Installing Gems

Install Bundler: gem install bundler

Install gems from Gemfile: bundle install

This creates Gemfile.lock with exact versions and installs all dependencies.

Version Operators

~> 7.0.0 - Approximately 7.0.x (pessimistic operator)
>= 5.0 - Greater than or equal to 5.0
gem 'rails' - Latest version

Creating Gemfile

Create manually or run bundle init to generate basic Gemfile. Add gems as needed with bundle add gemname .

Gemfile.lock

Bundler generates Gemfile.lock with exact versions. Commit this file to ensure everyone uses identical gem versions.

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