Update vehicles_controller.rb

app/controllers/vehicles_controller.rb

@@ -61,6 +61,7 @@ class VehiclesController < ApplicationController
   # update a specific vehicle
   def update
     @customer = params[:customer]
+    begin   
       @vehicle = Vehicle.find_by_id(params[:id])
       if @vehicle.update_attributes(params[:vehicle])
         flash[:notice] = "Vehicle updated"
@@ -69,6 +70,9 @@ class VehiclesController < ApplicationController
         flash[:error] = @vehicle.errors.full_messages.to_sentence if @vehicle.errors
         redirect_to edit_vehicle_path
       end
+    rescue ActiveRecord::RecordNotFound
+      render_404
+    end
   end  
 
   # delete a specific vehicle