Ruby on Rails,before_filter和prepend_before_filter排序是？

Question

在以下示例中,

before_filter :foo
before_filter :bar
before_filter :wah
prepend_before_filter :heehee
prepend_before_filter :haha

那么执行订单将是:

haha, heehee, foo, bar, wah?   <-- note that haha is actually before heehee

有没有理由不首先列出haha,heehee首先是实际使用prepend？

Answer 1

据我所知,这是为了解决类继承,你无法定义before_filter的顺序:

ApplicationController < ActionController::Base    
  before_filter :do_this_first    
  #....
end

SomeController < ApplicationController    
  before_filter :do_this_second
  #.... 
end

除非您使用prepend_before_filter,否则这两个定义的方法都没有首选项.