resolvePrimaryKey example

private readonly DefinitionInstanceRegistry $definitionInstanceRegistry,
        private readonly AbstractFieldSerializer $fieldSerializer
    ) {
    }

    public function resolvePrimaryKeyFromUpdatedBy(Config $config, ?EntityDefinition $definition, iterable $record): iterable
    {
        if (!$definition) {
            return $record;
        }

        return $this->resolvePrimaryKey(
            $config,
            $definition,
            $this->handleManyToManyAssociations($config, $definition, $record)
        );
    }

    private function resolvePrimaryKey(Config $config, EntityDefinition $definition, iterable $record): iterable
    {
        $updatedBy = $config->getUpdateBy()->get($definition->getEntityName());

        if (!$updatedBy) {