appraise "rails-4.0" do gem 'activerecord', "~> 4.0.0" gem "mongoid", "~> 4.0" end appraise "rails-4.1" do gem 'activerecord', "~> 4.1.0" gem "mongoid", "~> 4.0" end appraise "rails-4.2" do gem 'activerecord', "~> 4.2.0" gem "mongoid", "~> 4.0" end appraise "rails-5.0" do gem 'activerecord', "~> 5.0.0" gem 'mongoid', '~> 6.0.0' end appraise "rails-5.1" do gem 'activerecord', "~> 5.1.0" gem 'mongoid', '~> 6.1.0' end