https://github.com/mongoid/mongoid/blob/master/lib/mongoid/copyable.rb#L41
We have lose our versions data. So we don't need the version also. I think we need delete both version and versions, or not.
https://github.com/mongoid/mongoid/blob/master/lib/mongoid/copyable.rb#L41
We have lose our versions data. So we don't need the version also. I think we need delete both version and versions, or not.