References Polymorphism

[Nicholas Rowe]

Hello-

I have a series of Devices that all extend from a base class.  I would like to be able reference a device without having to know exactly what kind of device is being referenced.  Maybe something like:

class Test

       #...

  reference :device, Device::Base

end

class LoudTest < Device::Base

end

test = Test.new    

test.device = LoudDevice.new

and then be able to assign anything that inherits from Device::Base.  Is it possible to have polymorphic references like this?  Right now I seem to end up with argument errors.

Thanks!

-Nick

[Nicholas Rowe]

I ended up foregoing using the reference method and managed the association in my code.  It now looks like this:

class Device

  include Toy::Store

  attribute :device_adapter_id, String

  def device_adapter

    @device_adapter || load_device_adapter

  end

  def device_adapter=(device_adapter)

    self.device_adapter_id = device_adapter.id

    @device_adapter = device_adapter

  end

  private

  def load_device_adapter

    self.device_adapter = (Adapter::Base.read(device_adapter_id) || default_adapter)

  end

  def default_adapter

    Adapter::NilAdapter.new

  end

end

-Nick

[John Nunemaker]

Yeah there definitely is no way to do polymorphic out of the box. One thing you could do is namespace all your id's at the adapter level with the type. The caveat is you need to know the type when you are querying for it.

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