2015-11-09から1日間の記事一覧
Javaの文法の確認に使える https://github.com/albertlatacz/java-repl
http://stackoverflow.com/questions/5109893/rails-how-do-self-referential-has-many-models-work belongs_to :parent, :class_name => "Folder" has_many :folders, :foreign_key => "parent_id"