appraise "rails-4-2" do
  gem "rails", "~> 4.2.0"
end

appraise "rails-5-0" do
  gem "rails", "~> 5.0.0"
  gem "rspec-rails", "~> 3.5"
end

appraise "rails-5-1" do
  gem "rails", "~> 5.1.0"
  gem "rspec-rails", "~> 3.5"
end

appraise "rails-master" do
  gem "rails", git: 'https://github.com/rails/rails'
  gem "arel", git: 'https://github.com/rails/arel'
end