I'm querying an external timetable database, and I need to get the start and end points of the journey to use in a hidden field.

My template code looks like this:

{exp:get_piers:departure_pier cruise_id="{cruise_id}"}


{exp:get_piers:arrival_pier cruise_id="{cruise_id}"}

{cruise_id} is simply a numeric value that is set in the EE channel, but relates to the external database.

So I've created a plugin that looks like this:

class Get_piers {

    public $return_data;
    public $cruise_id;

     * Constructor
    public function __construct()
    $this->EE =& get_instance();
    //get cruise id from template tag
    $this->cruise_id = $this->EE->TMPL->fetch_param('cruise_id');
    //connect to external db
    $this->bookings_db = $this->EE->load->database('timetable', TRUE);

// ----------------------------------------------------------------

 * Departure Point
function departure_pier() {
    $piers = $this->bookings_db->select('depPier')
            ->where('cruiseID', $this->cruise_id)
    return $piers->row('depPier');

function arrival_pier() {   
    $piers = $this->bookings_db->select('arrPier')
            ->where('cruiseID', $this->cruise_id)
    return $piers->row('arrPier');

The problem is that the value for $this->cruise_id is showing in the query as '0', but if I try to return just the value for $this->cruise_id (outside the sql), I get the correct number passed through from the template.

What am I missing? I'm guessing its something to do with visibility inside/outside the function, but having tried lots of alternatives, it just ain't working for me.

Can anyone offer any pointers?

  • 2
    Have you tried setting $this->cruise_id inside of departure_pier() instead of inside the constructor? Commented Jun 5, 2014 at 17:36
  • Derek Hogue, please submit this as an answer. Commented Jun 5, 2014 at 20:16
  • Hi Derek, yes, I tried this and got the following fatal error. Cannot re-assign $this Commented Jun 5, 2014 at 20:44
  • Tried a couple more alternatives, but no progress yet. If I output $sql = "SELECT depPier FROM tbl_cruises WHERE cruiseID = $this->cruise_id" to screen, I get the query I want, but when I try and execute it, it seem its then that the $this->cruise_id variable is being nulled or zero'd. Commented Jun 5, 2014 at 21:42
  • What do you get if you manually construct your query rather than use EE/CI helpers to build it? ie $query="SELECT depPier FROM tbl_cruises WHERE cruiseID=".$this->cruise_id;
    – foamcow
    Commented Jun 6, 2014 at 9:57

1 Answer 1


Numpty alert...fixed. The original code was in fact working fine, I had a stray tag in my template that had an empty parameter value - hence the null value in the SQL.


  • Should we close the question?
    – Sobral
    Commented Jun 5, 2014 at 22:54
  • Yes - by all means - sorry :-) Commented Jun 5, 2014 at 23:00

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