From: "Matthias S." <mstumpp@...>
Date: 2011-02-10T00:42:55+09:00
Subject: Best practice to create a JSON string of one object containing an array of other objects using Ruby?

What is a good practice to create a JSON string of one object (object of
class A) containing an array of objects (objects of class B)? I am
particularly interessted in the implementation of class's A to_json
method.

Assuming class A looks as follows:

class A
  attr_accessor :items
  def initialize()
    @items = Array.new
  end
  def to_json(*a)
    ?SECRET OF THE DAY?
  end
end

and class B:

class B
  def to_json(*a)
    {"class B" => "class B"}.to_json(*a)
  end
end

The best solution I got so far is:

def to_json(*a)
  json = Array.new
  @items.each do |item|
    json << item.to_json(*a)
  end
  {"class A" => json}.to_json(*a)
end

Assuming there is only one item in array of an object of class A, the
resulting JSON string looks as follows:

{"class A":["{\"class B\":\"class B\"}"]}

I also tried:

def to_json(*a)
  {"class A" => @items}.to_json(*a)
end

But it results in IOError exception in class A, saying to_json "not
opened for reading"...

I am sure we can do better?

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