Ruby中delegate的一些用法

Class Account < ActiveRecord::Base
 
    delegate :firstname, :to => :user
    # firstname => user.firstname

    delegate :firstname, :to => :user, :prefix => true
    # user_firstname => user.firstname

    delegate :firstname, :to => :user, :allow_nil => true, :prefix => true
    # user_firstname => user.try(:firstname)
 
    delegate :name, :to => "user.try(:editor)", :prefix => :editor
    # editor_name => user.editor.name

    delegate :name, :to => "user.try(:editor)", :prefix => :editor, :allow_nil => true
    # editor_name => user.editor.try(:name)
 
end

参考：https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/module/delegation.rb