def remove_existing_customers!(customer_attribs, tour_id = nil)
    existing_customers = []
    customer_attribs.reject! do |key, value|
      existing_customer = nil
      tour = Tour.find(tour_id) if tour_id
      if value['id'].nil? || (tour && tour.customers.detect { |customer| customer.id.to_s == value['id'].to_s }.nil?)
        if existing_customer = Customer.find_by_name(value['name'])
          existing_customers << existing_customer
        end
      end
      existing_customer
    end unless customer_attribs.nil?
    existing_customers
  end

  # POST /tours
  # POST /tours.xml
  def create
    existing_customers = remove_existing_customers!(params[:tour][:customers_attributes])
    @tour = Tour.new(params[:tour])

    respond_to do |format|
      if @tour.save
        @tour.customers << existing_customers
        @tour.save
        flash[:notice] = 'Tour was successfully created.'
        format.html { redirect_to(@tour) }
        format.xml  { render :xml => @tour, :status => :created, :location => @tour }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @tour.errors, :status => :unprocessable_entity }
      end
    end
  end