Rails doesn't load classes on deserializing YAML/Marshal objects

Question

• Rails: 3.0.3
• Ruby: 1.9.2

Trying to deserialize a very simple object using YAML.load or Marshal.load produces a corru

Answer 1

To automatically require classes on YAML loading in the manner @fguillen suggests is elegant, I wrote this short monkey-patch.

It simply attempts to require_dependency any class the Psych ToRuby class resolves to classes.

Works for me in a serialised Active Record that stores a custom class instance, YMMV.

module Psych::Visitors
  ToRuby.class_eval do
    alias :resolve_class_without_autoload :resolve_class
    def resolve_class klassname
      begin
        require_dependency klassname.underscore 
      rescue NameError, LoadError
      end
      resolve_class_without_autoload klassname
    end
  end
end