/**
* Appends value to field, if field is an existing array, otherwise sets
* field to the array [value] if field is not present. If field is present
* but is not an array, an error condition is raised.
*
* @param mixed $value
* @return QueryProxy this instance
*/
public function push($value)
{
$this->queryChanged = true;
return parent::push($value);
}
