ruby 超级关键字 [英] ruby super keyword

问题描述

据我了解，super 关键字在当前类的超类中调用与当前方法同名的方法.在autoload 方法的下面，有一个对super 的调用.我想知道我会在哪个超类中找到同名的方法，或者对 super 的调用在这里做了什么

From what I understand, super keyword invokes a method with the same name as the current method in the superclass of the current class. Below in the autoload method, there is a call to super. I would like to know in which superclass I would find a method with the same name or what does the call to super do here

module ActiveSupport
  module Autoload
    ...      
    def autoload(const_name, path = @@at_path)
      full = [self.name, @@under_path, const_name.to_s, path].compact.join("::")
      location = path || Inflector.underscore(full)

      if @@eager_autoload
        @@autoloads[const_name] = location
      end
      super const_name, location
    end
   .... 
  end
end

module ActiveRecord
  extend ActiveSupport::Autoload
  ...
  autoload :TestCase
  autoload :TestFixtures, 'active_record/fixtures'
end

此代码来自 rails master 分支.非常感谢.

This code is from the rails master branch. Thanks much.

推荐答案

Ruby Docs 中为 super 关键字:

module Vehicular
  def move_forward(n)
    @position += n
  end
end

class Vehicle
  include Vehicular  # Adds Vehicular to the lookup path
end

class Car < Vehicle
  def move_forward(n)
    puts "Vrooom!"
    super            # Calls Vehicular#move_forward
  end
end

考察祖先

puts Car.ancestors.inspect

# Output
# [Car, Vehicle, Vehicular, Object, Kernel, BasicObject]

注意包含 Vehicular Module 对象！

这篇关于ruby 超级关键字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！