appraise 'rails3' do
  gem 'activerecord', '~> 3.2'
end

appraise 'rails4_1' do
  gem 'activerecord', '~> 4.1'
end

appraise 'rails4_2' do
  gem 'activerecord', '~> 4.2'
end

appraise 'rails5_0' do
  gem 'activerecord', '~> 5.0'
end

appraise 'rails5_1' do
  gem 'activerecord', '~> 5.1'
end