Granting permission to a model w/o reverse relationship definitions

[Edward Rudd]

Here is the scenario.

class Facility < ActiveRecord::Base

    belongs_to :address

    belongs_to :classified_address, :class_name => 'Address'

end

class Address < ActiveRecord::Base

# just fields and an ID,  NON-polymorphic

end

The question How do I grant access to manage the addresses that are associated with the facility?  Putting has_many on the address seems very unscalable as we have other models with belong_to an address.  Using polymorphic doesn't work either as we have different "types" of addresses (as seen in this example).

Any thoughts would be greatly appreciated..