public function getData($callback = null, Collection $dataCollection = null)
{
if (is_null($this->data)) {
// Initialise
$this->data = new Collection();
// Get a model instance
$foreignModel = $this->getForeignModel();
$foreignModel->setIgnoreRequest(true);
$filtered = $this->filterForeignModel($foreignModel, $dataCollection);
if (!$filtered) {
return $this->data;
}
// Apply the callback, if applicable
if (!is_null($callback) && is_callable($callback)) {
call_user_func($callback, $foreignModel);
}
// Get the list of items from the foreign model and cache in $this->data
$this->data = $foreignModel->get(true);
}
return $this->data;
}