Can something be done better?.rb

 def add_line_item_to_cart
    #Get current_cart object
    current_cart
    quantity = params[:quantity].to_i
    id = params[:id].to_i
    line_item = LineItem.find(:first, :conditions => {:cartridge_id => id, :cart_id => current_cart.id})


    if line_item
      line_item.cart_id = current_cart.id
      line_item.quantity += quantity
    else
      line_item = LineItem.new
      line_item.cartridge_id = id
      line_item.cart_id = current_cart.id
      line_item.quantity = quantity
    end
      line_item.save
      render :text => current_cart.line_items.count.to_s
  end