Any example of using simple_form with polymorphic associations?

[Kedar Mhaswade]

Just wanted to know if f.association can be used when models have
polymorphic associations.
Any example would be appreciated.

e.g. how'd I render a form to choose a receiver (which could be either
an event or a member) with following models?

class Alert < ActiveRecord::Base
attr_accessible :type, :content
belongs_to :receiver, :polymorphic => true
end

class Event
has_many :alerts, :as => receiver
# ...
end

class Member
has_many :alerts, :as => receiver
end

# corresponding changes are available in migrations

Best Regards,
Kedar

[Joe Ersinghaus]

Did you ever find an answer to this question? Or can anyone still post an example?