本文介绍了Ruby点括号调用语法的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧! 问题描述 29岁程序员,3月因学历无情被辞! 我正在阅读 jbuilder的自述文件并看到以下代码: class Person #... Class Definition ...# def to_builder Jbuilder.new do | person | person。(self,:name,:age) end end end 我自己尝试复制它,并要求调用方法,所以: class Thing attr_accessor:name,:age def call(* args) puts args.inspect 结束结束 Thing.new。(:name,:age)#=> [:name,:age] 那为什么会有 self 在 jbuilder 中调用?解决方案 self 这里只是一个传递给Jbuilder的调用方法的参数。 Jbuilder 需要 person (它是 self >代码中)以及代码中的属性名称(:name 和:age )来生成json数据 示例: class Thing attr_accessor:名称::age def call(* args) puts args.inspect end end class Bar def to_thing Thing.new。(self,:name,:age) end end Bar.new.to_thing I was reading the jbuilder's README and saw these code:class Person # ... Class Definition ... # def to_builder Jbuilder.new do |person| person.(self, :name, :age) end endendI tried to replicate it myself, and it asks for a call method, so:class Thing attr_accessor :name, :age def call(*args) puts args.inspect endendThing.new.(:name, :age) # => [:name, :age]So why is there a self in the jbuilder call? 解决方案 self here is just a parameter passed to the Jbuilder's call method.Jbuilder needs the instance of person (which is self in the code) and the attribute names (:name and :age in the code) to produce the json data.Example:class Thing attr_accessor :name, :age def call(*args) puts args.inspect endendclass Bar def to_thing Thing.new.(self, :name, :age) endendBar.new.to_thing 这篇关于Ruby点括号调用语法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! 上岸,阿里云!
08-24 02:38