attr-accessible

问题 With the recent upgrade to Rails 4, updating attributes using code resembling the below does not work, I get a ActiveModel::ForbiddenAttributes error: @user.update_attributes(params[:user], :as => :admin) Where User has the following attr_accessible line in the model: attr_accessible :role_ids, :as =>admin # or any attribute other than :role_ids contained within :user How do you accomplish the same task in Rails 4? 回答1: Rails 4 now has features from the strong_parameters gem built in by

问题 What happens in the background with the following code? class User < ActiveRecord::Base attr_accessor :name attr_accessible :name end Hint: When instantiating the class, will it be persisted to the database? Why or why not? 回答1: attr_accessor is ruby code and is used when you do not have a column in your database, but still want to show a field in your forms. The only way to allow this is to attr_accessor :fieldname and you can use this field in your View, or model, if you wanted, but mostly