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    <h3>Use Marshal, PStore, or another Ruby solution for non-JSON objects</h3> <p>One might reasonably wonder why a completely reflective language like Ruby doesn't automate JSON generation and parsing of arbitrary classes.</p> <p>However, unless you stick to the JSON types, there is no place to send or receive the JSON objects except to another running Ruby. And in that case, I suspect that the conventional wisdom is "forget JSON, use a native Ruby interface like the core class <code>Marshal</code>. </p> <p>So, if you are really sending those objects to PHP or something non-Ruby, then you should create directly JSON-supported Ruby data structures using Array and the like, and then you will have something that JSON.generate will directly deal with.</p> <p>If you just need serialization it's possible you should use <code>Marshal</code> or <code>PStore</code>.</p> <p>Update: Aha, ok, try this:</p> <pre><code>module AutoJ def auto_j h = {} instance_variables.each do |e| o = instance_variable_get e.to_sym h[e[1..-1]] = (o.respond_to? :auto_j) ? o.auto_j : o; end h end def to_json *a auto_j.to_json *a end end </code></pre> <p>If you then <code>include AutoJ</code> in each of your classes, it should DTRT. In your example this results in</p> <pre><code>{"a":{"string_field1":"aa","string_field2":"bb"},"b":{"int_field3":123,"string_field4":"dd"}} </code></pre> <p>You might want to change the <code>auto_j</code> method to return <code>h.values</code> instead of just <code>h</code>, in which case you get:</p> <pre><code>[["aa","bb"],[123,"dd"]] </code></pre>
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    1. COThanks, see my clarification. I *was* under the impression it would be a bit more automatic than it currently is.
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