/**
* Retrieves a value from cache with a specified key.
* This method should be implemented by child classes to retrieve the data
* from specific cache storage.
* @param string $key a unique key identifying the cached value
* @return string|boolean the value stored in cache, false if the value is not in the cache or expired.
*/
protected function getValue($key)
{
$query = new Query();
$row = $query->select(['data'])->from($this->cacheCollection)->where(['id' => $key, '$or' => [['expire' => 0], ['expire' => ['$gt' => time()]]]])->one($this->db);
if (empty($row)) {
return false;
} else {
return $row['data'];
}
}
/**
* Ensures migration history contains at least base migration entry.
*/
protected function ensureBaseMigrationHistory()
{
if (!$this->baseMigrationEnsured) {
$query = new Query();
$row = $query->select(['version'])->from($this->migrationCollection)->andWhere(['version' => self::BASE_MIGRATION])->limit(1)->one($this->db);
if (empty($row)) {
$this->addMigrationHistory(self::BASE_MIGRATION);
}
$this->baseMigrationEnsured = true;
}
}
/**
* Performs 'findAndModify' query and returns a single row of result.
* Warning: in case 'new' option is set to 'false' (which is by default) usage of this method may lead
* to unexpected behavior at some Active Record features, because object will be populated by outdated data.
* @param array $update update criteria
* @param array $options list of options in format: optionName => optionValue.
* @param Connection $db the Mongo connection used to execute the query.
* @return ActiveRecord|array|null the original document, or the modified document when $options['new'] is set.
* Depending on the setting of [[asArray]], the query result may be either an array or an ActiveRecord object.
* Null will be returned if the query results in nothing.
*/
public function modify($update, $options = [], $db = null)
{
$row = parent::modify($update, $options, $db);
if ($row !== null) {
$models = $this->populate([$row]);
return reset($models) ?: null;
} else {
return null;
}
}