appraise 'rails3' do
  gem 'activerecord', '3.2.21'
end

appraise 'rails4_1' do
  gem 'activerecord', '4.1.11'
end

appraise 'rails4_2' do
  gem 'activerecord', '4.2.2'
end

appraise 'rails5_0' do
  gem 'activerecord', '5.0.0'
end