From: "Hanmac (Hans Mackowiak)" <hanmac@...>
Date: 2013-02-20T21:53:41+09:00
Subject: [ruby-core:52577] [ruby-trunk - Bug #7893] Issues with loading YAML and respond_to_missing?


Issue #7893 has been updated by Hanmac (Hans Mackowiak).



the problem is in  yaml: to_ruby.rb "if o.respond_to?(:init_with)"   so eigher you need to define a init_with method or 

def respond_to_missing?(m, include_private = false)
  (@attributes && @attributes.key?(m)) || super
end
----------------------------------------
Bug #7893: Issues with loading YAML and respond_to_missing?
https://bugs.ruby-lang.org/issues/7893#change-36671

Author: injekt (Lee Jarvis)
Status: Open
Priority: Normal
Assignee: 
Category: core
Target version: 
ruby -v: 1.9.3p385


This is perhaps not a bug, I could be missing something, but shouldn't the following code work?

    require 'yaml'

    class Person
      def initialize(name)
        @attributes = { name: name }
      end

      def method_missing(m, *args, &block)
        @attributes.key?(m) ? @attributes[m] : super
      end

      def respond_to_missing?(m, include_private = false)
        @attributes.key?(m) || super
      end
    end

    dump = YAML.dump Person.new("lee")
    load = YAML.load dump

The YAML.dump appears to work as expected, yet when I attempt to `load` the dump back, I get the following exception:

    /Users/lee/bin/rb:15:in `respond_to_missing?': undefined method `key?' for nil:NilClass (NoMethodError)
      from /Users/lee/.rubies/1.9.3-p385/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:291:in `respond_to?'
      from /Users/lee/.rubies/1.9.3-p385/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:291:in `init_with'
      from /Users/lee/.rubies/1.9.3-p385/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:284:in `revive'
      
However doing the same thing with JSON for example, works fine: https://gist.github.com/injekt/0a4aa3e25f09ae2f8cba


-- 
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