/**
* Ensures the existing item is instantiated and valid.
*/
protected function assertItem()
{
if (isset($this->item)) {
return true;
}
if (!isset($this->item_id)) {
throw new vB_Exception_DM('No item id specified for creating an existing item in ' . get_class($this));
}
$this->item = new $this->item_class($this->item_id);
if (!$this->item->isValid()) {
throw new vB_Exception_DM('The existing item assigned to the DM is not valid (class: ' . $this->item_class . ' id: ' . print_r($this->item_id, 1) . ')');
}
}
