appraise 'activerecord_4_1' do
  gem 'activerecord', '~> 4.1.0', '>= 4.1.15'
end

appraise 'activerecord_4_2' do
  gem 'activerecord', '~> 4.2.0', '>= 4.2.6'
end

appraise 'activerecord_5_0' do
  gem 'activerecord', '>= 5.0.0.beta3', '< 5.1'
end

appraise 'github_head' do
  gem 'activerecord', git: 'https://github.com/rails/rails.git'
  gem 'martinet', git: 'https://github.com/TangRufus/martinet.git'
end