appraise 'rails-4.0' do
  gem 'activerecord', '~> 4.0.0'
end

appraise 'rails-4.1' do
  gem 'activerecord', '~> 4.1.0'
end

appraise 'rails-4.2' do
  gem 'activerecord', '~> 4.2.0'
end