From: Brian Candler <b.candler@...>
Date: 2011-02-10T06:00:39+09:00
Subject: Re: Best practice to create a JSON string of one object containing an array of other objects using R

Matthias S. wrote in post #980645:
> @Brian: Both approaches you proposed result in IOError exception in
> class A, saying to_json "not opened for reading".

Can you paste the *exact* exception you see, and the exact code which 
triggers it? Plus details of the platform you are on.

It works for me:

$ ruby -v
ruby 1.8.7 (2010-06-23 patchlevel 299) [x86_64-linux]
$ ruby ert.rb
#<A:0x7f23333ad7e0 @a=[123, 456]>
{"a":[123,456],"json_class":"A"}
#<A:0x7f23333a7598 @a=[123, 456]>

That's running the code I posted, just with the addition of

require 'rubygems'
require 'json'       # also works with require 'json/pure'

at the top. I have the json-1.4.3 gem installed, and json_pure-1.4.3.

Regards,

Brian.

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