How do we support polymorphic associations?

[notfelineit]

Some of our APIs return polymorphic associations, as in, the return value could be one of a few different models.

It would be nice to be able to do some kind of "OR", "anyOf", or "oneOf" action, something like:

def_param_group :user do
    # some params here
end

def_param_group :robot do
   # some params here
end

# later on in in a returns block
property :entity, Hash, oneOf: [:user, :robot]

is that possible today?