logger unknown(msg) fatal(msg) error(msg) warn(msg) inf […]
Response method Method Description render redirect_to s […]
File Upload(Save file system) <%= form_tag([ […]
params post data <form method=”POST”> […]
Callback Do something before, after model operations be […]
Active::Model::Model Not database model Example) Search […]
Validation ActiveModel::Validations::XxxxxValidator cla […]
create, update, delete update_all Update all which are […]
ViewHelper app/helpers xxxxx_helper.rb basically, all h […]
link_to method, remote, data, attribute <%= link_to […]