# File activerecord/lib/active_record/legacy_yaml_adapter.rb, line 3
def self.convert(klass, coder)
  return coder unless coder.is_a?(Psych::Coder)

  case coder["active_record_yaml_version"]
  when 1, 2 then coder
  else
    if coder["attributes"].is_a?(AttributeSet)
      Rails420.convert(klass, coder)
    else
      Rails41.convert(klass, coder)
    end
  end
end