li3 relationship

li3_rel.php

<?php
// registrations model, foreign key is session_id and *not* venue_session_id:
class Registrations extends \lithium\data\Model {

  public $belongsTo = array(
    'VenueSessions' => array('key' => array('session_id' => 'id')),
    // also tried this, which doesn't work:
    // 'VenueSessions' => array('class' => 'VenueSessions', 'key' => 'session_id'),
  );
...
}

// and VenueSessions model:
class VenueSessions extends \lithium\data\Model {
  public $hasMany = array(
    'Registrations' => array('class' => 'Registrations', 'key' => 'session_id')
  );
...
}

// and then a query using the relationship:
$results = Registrations::find('all', array(
        'conditions' => $conditions,
        'with' => 'VenueSessions',
      ));