doctrine / mongodb-odm

     * @return object

     * @throws InvalidArgumentException if the class does not have an identifier

     */

    public function getById($id, ClassMetadata $class)

    {

        if ( ! $class->identifier) {

            throw new \InvalidArgumentException(sprintf('Class "%s" does not have an identifier', $class->name));

        }

        $serializedId = serialize($class->getDatabaseIdentifierValue($id));

        return $this->identityMap[$class->name][$serializedId];

    }

    /**

     * INTERNAL:

     * @return mixed The found document or FALSE.

     * @throws InvalidArgumentException if the class does not have an identifier

     */

    public function tryGetById($id, ClassMetadata $class)

    {

        if ( ! $class->identifier) {

            throw new \InvalidArgumentException(sprintf('Class "%s" does not have an identifier', $class->name));

        }

        $serializedId = serialize($class->getDatabaseIdentifierValue($id));

        return $this->identityMap[$class->name][$serializedId] ?? false;

    }

    /**

     * Schedules a document for dirty-checking at commit-time.