Rails でコントローラーとビューの共通メソッドを作成

class ApplicationController < ActionController::Base # ... helper_method :canonical_user_path # return canonical user path def canonical_user_path(user) unless user.is_a? User user = User.find(user) end if user.blank? return nil end if user.provider.blank? && user.userid.present? # for a normal user who has a canonical userid. # return user's path like root/takafumi "/#{user.userid}" else # for oa