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 […]

If there is no action method, Rails finds template file […]

Generate Exception Use @throw @throw @"test exception"; […]

hosts hosts file is same as Linux system. In Android, / […]