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POSerialization/Deserialization ruby object in YAML
 

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  1. POSerialization/Deserialization ruby object in YAML
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    <p>I'm trying to understand the serialization/deserialization of ruby object using YAML under 1.8.7 and 1.9+ and have a few queries regarding it (I can't find much documentation on this)</p> <h3>Ruby 1.8.7</h3> <pre><code>class Element yaml_as "tag:ruby.yaml.org,2002:Element" def self.yaml_new(klass, tag, val) puts "print you are in yaml" end end YAML.parser =&gt; syck ## parser is set as syck all good e = Element.new.to_yaml =&gt; "--- !ruby/Element {}\n\n" </code></pre> <p>Question 1: Now why didn't I get <code>tag:ruby.yaml.org,2002:Element</code> instead of <code>--- !ruby/Element {}\n\n</code> ?</p> <pre><code> YAML.load(e) =&gt; print your are in "yaml" ##print statement execute all good ## Not sure who to change the parser in 1.8 to `pysch` so skipping this part </code></pre> <h3>Ruby 1.9+</h3> <pre><code> YAML::ENGINE.yamler =&gt; pysch e = Element.new.to_yaml =&gt; "--- !&lt;tag:ruby.yaml.org,2002:Element&gt; {}\n" ## I see the tag in 1.9+ fine </code></pre> <p>Question 2 : Why is it working in 1.9+ and not in 1.8.7 ?</p> <pre><code> YAML.load(e) =&gt; ## The print is not getting printed </code></pre> <p>Question 3: Why <code>print you are in yaml</code> isn't getting printed? In other words, why is <code>self.yaml_new</code> not getting invoked on <code>YAML.load</code>? Is it not supported under 1.9+ ?</p> <pre><code> YAML::ENGINE.yamler = 'syck' =&gt; syck u = Element.new.to_yaml =&gt; "--- !ruby/object:Element {}\n\n" </code></pre> <p>Question 4 (similar to question #1) : Why is the the tag(<code>tag:ruby.yaml.org,2002:Element</code>) missing in the <code>serialize</code> yaml above</p> <pre><code> YAML.load(e) =&gt; ## Suprisingly, print is not executed </code></pre> <p>Question 5 (similar to question #2): Why isn't <code>self.yaml_new</code> getting executed for <strong>syck</strong> and <strong>pysch</strong> parser in ruby 1.9+ ?</p> <p>Can anyone can help me resolve these questions?</p>
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    1. COIf I were to guess on the executions, it's probably not happening for security reasons. YAML used to be built-in for Ruby 1.8.7, but now it's a separate module under a different parser/engine. Documentation for Ruby 2.0 does not seem to be up on the rdocs, but I think yaml_new only gets called in Rails, not in Ruby
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    2. COI'd recommend fixing the formatting. All the bold text is like yelling. A tiny bit goes a very long way; it's painful to read, making me not want to even try. Plus, on SO, YOU GET TWO, maybe THREE questions at most so reduce what YOU WANT TO ASK!
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