ActiveModel::Conversion

@aaronjensen Too bad I didn't know this existed before now:

If your object is already designed to implement all of the Active Model you can use the default :to_model implementation, which simply returns self. If your model does not act like an Active Model object, then you should define :to_model yourself returning a proxy object that wraps your object with Active Model compliant methods.

Full article: http://api.rubyonrails.org/v3.2.16/classes/ActiveModel/Co...