<<红宝石中的运算符 [英] << operator in ruby

问题描述

我对红宝石很陌生，

我在rails中遇到了以下代码，但是我不知道<<"如何.运算符的工作原理及其在以下代码中的作用

I came across the following code in rails, but I don't know how the "<<" operator works and what it does in the below code

def <<( rate )
  r = Rating.new
  r.rate = rate
  r.rateable = proxy_owner
  ...
  ...
end
class << ActiveRecord::Base
  ...
  ...
end

有人可以向我解释吗?

，这是代码 https ://github.com/azabaj/acts_as_rateable/blob/master/lib/acts_as_rateable.rb

推荐答案

def <<( rating ): 在您的示例中，这用于向可评估的模型添加评估. (例如， acts_as_rateable.rb:41 )，类似将某些内容附加到字符串(str << "abc").由于它在模块中，因此仅会包含在您声明为可评估的模型中.

def <<( rating ): In your example, this is used to add a rating to a rateable model. (E.g. in acts_as_rateable.rb:41), similar to appending something to a string (str << "abc"). As it is within a module, it will only be included for the models that you declare as rateable.

class << ClassName:

此块中的所有方法均为静态/类方法(请参见

All the methods inside of this block will be static / class methods (see this blog entry). (In this case, all the models will have the methods Model.example_static_method.)

这篇关于&lt;&lt;红宝石中的运算符的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！