Error .: Undefined index: order_id :.

just "installing" yourcart for the first time and have set up all the db's etc and now when executing it returns this error: http://www.chrismiddleton.co.uk/rock/classes/db_cart/db_cart_example.php

// show total value of the current cart
   function show_total_value() {
      $sql = sprintf("SELECT SUM(quantity * price) AS total FROM %s WHERE order_id = %d", ORDER_ROWS, $_SESSION['order_id']);
      if (!$result = mysql_query($sql)) {
         $this->error = $this->messages(1);
         return;
      } else {
         $total_amount = mysql_result($result, 0, "total");
         mysql_free_result($result);
         return $total_amount;
      }
   }

Any help much appreciated,


Thanks,
Chris Middleton

having just gone back through my db's i realise its something i have missed out. Sorry for wasting your time!!

Chris

having just gone back through my db's i realise its something i have missed out. Sorry for wasting your time!!

Chris

you didn't 

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