public function getAllEdges()
{
$criteria = new CDbCriteria(array('condition' => '(t.source=' . $this->id . ') or (t.target=' . $this->id . ')'));
$model = Edge::model();
$model->getDbCriteria()->mergeWith($criteria);
return $model->with('target_node', 'source_node')->findAll();
}
