/**
* @inheritdoc
*/
public function attributeLabels()
{
if (!$this->_attributeLabels) {
foreach ($this->relations as $model) {
$this->_attributeLabels = ArrayHelper::merge($this->_attributeLabels, $model->attributeLabels());
}
$this->_attributeLabels = ArrayHelper::merge($this->_attributeLabels, $this->model->attributeLabels());
}
return $this->_attributeLabels;
}
