Rails - Feb 2008 - activeresource problems

I have been experimenting with active resource recently but came
across a problem. I receive a 404 error when trying to create a new
object. The prescription object belongs to a device object.


Processing PrescriptionsController#create (for 127.0.0.1 at 2008-02-24
20:41:06) [POST]
  Session ID: 7bb36ceab59dfac446b7d21dd3c6a45e
  Parameters: {"format"=>"xml",
"action"=>"create",
"controller"=>"prescriptions",
"prescription"=>{"device_id"=>4,
"count"=>4}}


ActiveRecord::RecordNotFound (Couldn''t find Device without an ID):

I have an activeresource class definition that looks like

class Prescription < ActiveResource::Base
  self.site = http://www.WEBHOST.com'' #modified
end

Then issue Prescription.create(:device_id => 1, :count => 1) which
raises the above error.
Other class definitions work flawlessly. What might be going on?
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after recreating the entire model step for with Rails project using
the recomended nested resources method my project now looks like.

I am using nested resource defined in routes.rb
 map.resources :devices do |device|
  device.resources :prescriptions
 end

I define the network class definition for Prescription as

class Prescription < WebResource
 self.site += "/devices/:device_id/"
end

This should allow for calls like
Prescription.find(:all, :device_id => 1) or
Prescription.create(:device_id => 1, :drug_id => 4)

Unfortunatly it fails with a 404 error the log has
ActionController::RoutingError (No route matches "/devices//
prescriptions.xml" with {:method=>:post}):

Why is the device_id parameter not being passed?
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