model中delegate的使用

经常会遇到这种情况

study_record.lesson.name
study_record.course_package.name

可以采用委托实现更优美的代码：

class StudyRecord < ActiveRecord::Base
  belongs_to :user
  belongs_to :lesson
  belongs_to :course_package
  
  delegate :name, :to => :lesson, :prefix => true
  delegate :name, :to => :course_package, :prefix => true
  
end

　

<%= study_record.lesson_name%>
<%= study_record.course_package_name%>