Installing Rails Core Development Dependencies

1 Other Ways to Set Up Your Environment

If you don't want to set up Rails for development on your local machine, you can use Codespaces, the VS Code Remote Plugin, or rails-dev-box. Learn more about these options here.

2 Local Development

If you want to develop Ruby on Rails locally on your machine, see the steps below.

2.1 Install Git

Ruby on Rails uses Git for source code control. The Git homepage has installation instructions. There are a variety of resources online that will help you get familiar with Git.

2.2 Clone the Ruby on Rails Repository

Navigate to the folder where you want to download the Ruby on Rails source code (it will create its own rails subdirectory) and run:

$ git clone https://github.com/rails/rails.git
$ cd rails

2.3 Install Additional Tools and Services

Some Rails tests depend on additional tools that you need to install before running those specific tests.

Here's the list of each gems' additional dependencies:

• Action Cable depends on Redis
• Active Record depends on SQLite3, MySQL and PostgreSQL
• Active Storage depends on Yarn (additionally Yarn depends on Node.js), ImageMagick, libvips, FFmpeg, muPDF, Poppler, and on macOS also XQuartz.
• Active Support depends on memcached and Redis
• Railties depend on a JavaScript runtime environment, such as having Node.js installed.

Install all the services you need to properly test the full gem you'll be making changes to. How to install these services for macOS, Ubuntu, Fedora/CentOS, Arch Linux, and FreeBSD are detailed below.

Below you can find instructions on how to install all of the additional tools for different operating systems.

2.3.1 macOS

On macOS you can use Homebrew to install all of the additional tools.

To install all run:

$ brew bundle

You'll also need to start each of the installed services. To list all available services run:

$ brew services list

You can then start each of the services one by one like this:

$ brew services start mysql

Replace mysql with the name of the service you want to start.

2.3.2 Ubuntu

To install all run:

$ sudo apt-get update
$ sudo apt-get install sqlite3 libsqlite3-dev mysql-server libmysqlclient-dev postgresql postgresql-client postgresql-contrib libpq-dev redis-server memcached imagemagick ffmpeg mupdf mupdf-tools libxml2-dev libvips42 poppler-utils

# Install Yarn
# Use this command if you do not have Node.js installed
# ref: https://github.com/nodesource/distributions#installation-instructions
$ sudo mkdir -p /etc/apt/keyrings
$ curl --fail --silent --show-error --location https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | sudo gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg
$ echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_20.x nodistro main" | sudo tee /etc/apt/sources.list.d/nodesource.list
$ sudo apt-get update
$ sudo apt-get install -y nodejs

# Once you have installed Node.js, install the yarn npm package
$ sudo npm install --global yarn

2.3.3 Fedora or CentOS

To install all run:

$ sudo dnf install sqlite-devel sqlite-libs mysql-server mysql-devel postgresql-server postgresql-devel redis memcached ImageMagick ffmpeg mupdf libxml2-devel vips poppler-utils

# Install Yarn
# Use this command if you do not have Node.js installed
# ref: https://github.com/nodesource/distributions#installation-instructions-1
$ sudo dnf install https://rpm.nodesource.com/pub_20/nodistro/repo/nodesource-release-nodistro-1.noarch.rpm -y
$ sudo dnf install nodejs -y --setopt=nodesource-nodejs.module_hotfixes=1

# Once you have installed Node.js, install the yarn npm package
$ sudo npm install --global yarn

2.3.4 Arch Linux

To install all run:

$ sudo pacman -S sqlite mariadb libmariadbclient mariadb-clients postgresql postgresql-libs redis memcached imagemagick ffmpeg mupdf mupdf-tools poppler yarn libxml2 libvips poppler
$ sudo mariadb-install-db --user=mysql --basedir=/usr --datadir=/var/lib/mysql
$ sudo systemctl start redis mariadb memcached

2.3.5 FreeBSD

To install all run:

$ sudo pkg install sqlite3 mysql80-client mysql80-server postgresql11-client postgresql11-server memcached imagemagick6 ffmpeg mupdf yarn libxml2 vips poppler-utils
# portmaster databases/redis

Or install everything through ports (these packages are located under the databases folder).

2.3.6 Debian

To install all dependencies run:

$ sudo apt-get install sqlite3 libsqlite3-dev default-mysql-server default-libmysqlclient-dev postgresql postgresql-client postgresql-contrib libpq-dev redis-server memcached imagemagick ffmpeg mupdf mupdf-tools libxml2-dev libvips42 poppler-utils

2.4 Database Configuration

There are couple of additional steps required to configure database engines required for running Active Record tests.

PostgreSQL's authentication works differently. To set up the development environment with your development account, on Linux or BSD, you just have to run:

$ sudo -u postgres createuser --superuser $USER

and for macOS:

$ createuser --superuser $USER

Then, you need to create the test databases for both MySQL and PostgreSQL with:

$ cd activerecord
$ bundle exec rake db:create

You can also create test databases for each database engine separately:

$ cd activerecord
$ bundle exec rake db:mysql:build
$ bundle exec rake db:postgresql:build

and you can drop the databases using:

$ cd activerecord
$ bundle exec rake db:drop

If you're using another database, check the file activerecord/test/config.yml or activerecord/test/config.example.yml for default connection information. You can edit activerecord/test/config.yml to provide different credentials on your machine, but you should not push any of those changes back to Rails.

2.5 Install JavaScript Dependencies

If you installed Yarn, you will need to install the JavaScript dependencies:

$ yarn install

2.6 Installing Gem Dependencies

Gems are installed with Bundler which ships by default with Ruby.

To install the Gemfile for Rails run:

$ bundle install

If you don't need to run Active Record tests, you can run:

$ bundle install --without db

2.7 Contribute to Rails

After you've set up everything, read how you can start contributing.

Feedback

You're encouraged to help improve the quality of this guide.

Please contribute if you see any typos or factual errors. To get started, you can read our documentation contributions section.

You may also find incomplete content or stuff that is not up to date. Please do add any missing documentation for main. Make sure to check Edge Guides first to verify if the issues are already fixed or not on the main branch. Check the Ruby on Rails Guides Guidelines for style and conventions.

If for whatever reason you spot something to fix but cannot patch it yourself, please open an issue.

And last but not least, any kind of discussion regarding Ruby on Rails documentation is very welcome on the official Ruby on Rails Forum.