Stackoverflow
Stackoverflow
http://stackoverflow.com/questions/2439170/ruby-and-ruby-on-rails-offline-api-documentation
Railsbrain
Railsbrain
http://railsbrain.com
Apidock
Apidock
http://apidock.com/rails/browse
Edgeguides
Edgeguides
http://edgeguides.rubyonrails.org/api_documentation_guidelines.html
Rubyonrails
Rubyonrails
http://rubyonrails.org/documentation
Ruby Core API
Ruby Core API
http://ruby-doc.org/core/
Api
Api
http://api.rubyonrails.org
Ruby on Rails API
Ruby on Rails API
http://api.rubyonrails.com/