some CrAzY code (not pretty!)

class AddElectricOpToVehicleModels < ActiveRecord::Migration
  def self.up
    
    test = VehicleModel.find(:first)
        if test.attributes["electric_percent"] != nil
          down 
        end
    
    add_column :vehicle_models, :electric_percent, :float, :default => 0

     # for each of the base fuel drivetrains: adv.ci, adv.si, fc.hev
     ["ci","si","fc"].each do |dt|
         dt_like = dt + ".phev%"
         cars = Drivetrain.find(:all,:conditions=>"name like '#{dt_like}'").map(&:vehicle_models).flatten
        drivetrain = Drivetrain.find_by_name case dt
            when "fc"; "fc.hev"
            else;      "adv."+dt
          end
        puts dt_like , " "
        puts "cars.length: ", cars.length, "\n"
         # Now we have to look up each id, save off pertinent information
         # and find the analogs with PHEV behavior.
      
         cars.each do |car| ## cars are phevs!
            baseVeh = drivetrain.vehicle_models.find_by_year_and_power_percent_and_vehicle_class(car.year,car.power_percent, car.vehicle_class)
       
            eVal = 1-(baseVeh.avg_mpg.to_f/car.avg_mpg.to_f)
            car.update_attribute(:electric_percent,eVal.to_f)
         
          end
      end
  end

  def self.down
    remove_column :vehicle_models, :electric_percent
  end
end