Undefined class/module error

[korrs]

ArgumentError: undefined class/module MyAnyUploader::Uploader70191477934880

This happens when i use audited for versioning model with field which used for CarrierWave. Audited write to audited_changes ruby object(CarrierWave uploader instance).

Error occurs when audited try to load from yaml ruby object and can't find dynamically generated CarrierWave class for object.

[341bms]

Same here.

[Go-Faram]

me too

[korrs]

It's common deserialization problem for objects which doesn't have class in current runtime. I think possible solution can be storing values as primitives(String, DateTime) which always exists.

[guizaols]

I know this is pretty old but still open so could be helpful anyway.

I got this Psych monkey patch and add what @korrs mentioned about CarrierWave and could load my audits with uploaders instance properly.

Thanks a lot @korrs!

module Psych
  def self.load(yaml, filename = nil, max_retries = 100)
    retries = 0
    uploader = nil
    begin
      result = Psych.parse(yaml, filename)
      result ? result.to_ruby : result
    rescue ArgumentError => e
      retries += 1
      if e.message.include?('undefined class/module') && retries < max_retries
        name = e.message.sub 'undefined class/module ', ''
        parts = name.split '::'
        if parts.length == 1
          klass = parts.only
          mod = Module
        else
          klass = parts[-1]
          mod = parts[0..-2].join('::').constantize
        end
        uploader = mod if klass.include?('Uploader')
        mod.const_set(klass, uploader)
        retry
      end
      raise e
    end
  end
end