Question

If I write the following code for example in ‘Gemfile’:

group :development do
gem 'xyz'
end

group:test do
gem 'xyz'
end

What does that mean?

Thanks.

Answer 1

You can specify which gems should be installed in which environment. For example, you might wanna use SQLite for development and testing, but MySQL on production. So you would write:

gem 'devise'

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

group :production do
  gem 'mysql2'
end

Running bundle install --without development:test will install devise and mysql2 gems.