橋本商会

こういうjsonへのシリアライズ方法が書かれてないクラスを使って、to_jsonすると

#!/usr/bin/env ruby

require 'rubygems'

require 'json'



class User

  attr_reader :id, :name

  def initialize(id, name)

    @id = id

    @name = name

  end

end



users = Array.new

['user1', 'user2', 'shokai'].each_with_index{|name,id|

  users.push User.new(id, name)

}



puts users.to_json

クラス名が出てきてしまう

["#<User:0x007fc17b8bda50>","#<User:0x007fc17b8bda28>","#<User:0x007fc17b8bda00>"]

JSON implementation for Rubyに、to_json(*a)を定義しろって書いてあった

#!/usr/bin/env ruby

require 'rubygems'

require 'json'



class User

  attr_reader :id, :name

  def initialize(id, name)

    @id = id

    @name = name

  end



  ## JSON作る

  def to_json(*a)

    {

      :id => @id,

      :name => @name

    }.to_json(*a)

  end

end



users = Array.new

['user1', 'user2', 'shokai'].each_with_index{|name,id|

  users.push User.new(id, name)

}



puts users.to_json

ちゃんと出てきた

[{"id":0,"name":"user1"},{"id":1,"name":"user2"},{"id":2,"name":"shokai"}]