/**
* @param $keys
* @return array
*/
public function select($keys)
{
if (!is_null($keys)) {
// get the keys from the url
$keys = explode(',', $keys);
// validate that these keys are exists in database
$keys = array_intersect($keys, $this->columns);
// some fields must always returned back
$keys = array_merge($keys, array($this->object->getKeyName(), $this->object->getCreatedAtColumn(), $this->object->getUpdatedAtColumn()));
// make sure we return unique values
return array_unique($keys);
}
return array('*');
}