|
public scalar ( string $field, |
||
| $field | string | name of the attribute to select |
| $db | the database connection used to execute the query. If this parameter is not given, the `elasticsearch` application component will be used. | |
| 리턴 | string | the value of the specified attribute in the first record of the query result. Null is returned if the query result is empty or the field does not exist. |
public function scalar($field, $db = null)
{
$record = self::one($db);
if ($record !== false) {
if ($field === '_id') {
return $record['_id'];
} elseif (isset($record['_source'][$field])) {
return $record['_source'][$field];
} elseif (isset($record['fields'][$field])) {
return count($record['fields'][$field]) == 1 ? reset($record['fields'][$field]) : $record['fields'][$field];
}
}
return null;
}