Strange Model class name lookups when using namespaces

[ejlangev]

The following case fails (assume that ApplicationRepresenter sets up the included modules for Roar and ApplicationController includes Roar::Rails::ControllerAdditions:

module Instruments
  class Trumpet < ActiveRecord::Base
  end

  class TrumpetRepresenter < ApplicationRepresenter
  end

  class TrumpetsController < ApplicationController
    def show
      trumpet = Trumpet.find(params[:id])
      respond_with trumpet
    end
  end
end

The error is: Uninitialized Constant Instruments::Instruments. Seems like a better method of selecting a representer would be the following:

Assume you have a controller namespaced as N1::N2::Controller and a representer namespaced as N1::ModelRepresenter:

Check for the following constants in order and if none is found then fail with Uninitialized constant: N1::ModelRepresenter

N1::N2::N1::ModelRepresenter
N1::N1::ModelRepresenter
N1::ModelRepresenter

This way if the model is not namespaced it takes on the controllers namespace by default but can still find an un-namespaced representer.