From: Brian Candler <b.candler@...>
Date: 2011-02-10T06:01:05+09:00
Subject: Re: Best practice to create a JSON string of one object containing an array of other objects using R

And here is a working example for your code where class A includes 
instances of class B:

$ cat ert2.rb
require 'rubygems'
require 'json'

class A
  attr_accessor :items
  def initialize()
    @items = Array.new
  end
  def to_json(*a)
    {
      "json_class" => self.class.name,
      "items" => @items,
    }.to_json(*a)
  end
end

class B
  def to_json(*a)
    {
      "json_class" => self.class.name,
    }.to_json(*a)
  end
end

a = A.new
a.items << B.new
a.items << B.new
puts a.to_json

$ ruby ert2.rb
{"items":[{"json_class":"B"},{"json_class":"B"}],"json_class":"A"}

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