What is the structure of a Gemfile in a Rails application?

What is the structure of a Gemfile in a Rails application?

A Gemfile in a Rails application specifies the gems required for the project. It typically includes a source declaration, gem dependencies, and groups for different environments.

Can you give me an example of a Gemfile?

Sure! Here's a simple example:

source 'https://rubygems.org'

gem 'rails', '~> 6.1'
gem 'pg', '>= 0.18', '< 2.0'
gem 'puma', '>= 4.1'

group :development, :test do
  gem 'byebug'
end

What do the different groups in a Gemfile mean?

Groups in a Gemfile allow you to specify gems that are only needed in certain environments, like development or test. This helps keep your production environment clean.

How do I install the gems listed in my Gemfile?

You can install the gems by running the command bundle install in your terminal. This will fetch and install all the gems specified in your Gemfile.