I un-KLCannonized it... this looks ok, yeah?

gistfile1.txt

  # This will associate ANY device type with an ESI and create the
  # associated EsiDeviceType record properly populated.
  def add_device

        #Look up device to add
        @device = Kernel.const_get(self.model_name).find(params[:id])

        #Ok, this line is some serious black magic and needs explained...
	# 1.  Extract the name of the model	(device	type)
	# 2.  Create the matching EsiDevice object by
	# 3.  mapping any attributes present in	the device model with a	matching
	#     attribute	in the EsiDevice.
        @esi_dev = Kernel.const_get("Esi#{self.model_name}").new(
                @device.attributes.delete_if{|k,v|
                        !Kernel.const_get("Esi#{self.model_name}").respond_to?(k)
                                                })

        #Set the ESI ID in both?
        @device.esi_id = params[:esi_id]
        @esi_dev.esi_id = params[:esi_id]

        #Save both
        @device.save!
        @esi_dev.save!

  end