Gemfile-rails-dependencies

version_file = File.expand_path("../.rails-version", __FILE__)
version = ENV.fetch('RAILS_VERSION') {
  File.read(version_file).chomp if File.exist?(version_file)
}

if version && !version.empty?
  if version.end_with?("stable")
    gem_list = %w[
      rails
      railties
      actionmailer
      actionpack
      activerecord
      activesupport
      activejob
      actionview
    ]
    gem_list.each do |rails_gem|
      gem rails_gem, git: "https://github.com/rails/rails.git", branch: version
    end
  else
    gem "rails", version
  end
elsif RUBY_VERSION.to_f < 2.4
  gem "rails", "~> 4.2.0"
else
  gem "rails", "~> 5.1"
end