/**
* Executes query and returns a single row of result.
* @param Connection $db the DB connection used to create the DB command.
* If null, the DB connection returned by [[modelClass]] will be used.
* @return ActiveRecord|array|null a single row of query result. Depending on the setting of [[asArray]],
* the query result may be either an array or an ActiveRecord object. Null will be returned
* if the query results in nothing.
*/
public function one($db = null)
{
if (($result = parent::one($db)) === false) {
return null;
}
if ($this->asArray) {
return $result;
} else {
/* @var $class ActiveRecord */
$class = $this->modelClass;
$model = $class::instantiate($result);
$class::populateRecord($model, $result);
if (!empty($this->with)) {
$models = [$model];
$this->findWith($this->with, $models);
$model = $models[0];
}
$model->afterFind();
return $model;
}
}
/**
* @inheritdoc
*/
protected function getMigrationHistory($limit)
{
$tables = [];
foreach ($this->db->createCommand()->getTables() as $table) {
$tables[] = $table['table_name'];
}
if (!in_array($this->migrationTable, $tables)) {
$this->createMigrationHistoryTable();
}
$query = new Query();
$rows = $query->select(['version', 'apply_time'])->from($this->migrationTable)->orderBy('version DESC')->limit($limit)->createCommand($this->db)->queryAll();
$history = ArrayHelper::map($rows, 'version', 'apply_time');
unset($history[self::BASE_MIGRATION]);
return $history;
}