gistfile1.rbx

class Accuracy < ActiveRecord::Base
  belongs_to :measurable, :polymorphic => true
end

class Organisation < ActiveRecord::Base
  has_one :accuracy, :as => :measurable
end

class CreateAccuracies < ActiveRecord::Migration
  def self.up
    create_table :accuracies do |t|
      t.references :measurable, :polymorphic => true
      t.integer :rating
      
      t.timestamps
    end
  end

  def self.down
    drop_table :accuracies
  end
end