resolveFields example

$result->type = $this->type;

        if ($criteria->calculateTotal) {
            $result->total = (int) $this->connection->fetchColumn('SELECT FOUND_ROWS()');
        }

        if ($criteria->loadTranslations) {
            $items = $this->translateItems($query->execute()->fetchAll());
        }

        if ($criteria->loadAssociations) {
            $items = $this->fieldResolver->resolveFields($this->type, $items);
        }

        $result->items = $items;

        return $result;
    }

    public function save(array $data, ?int $id = null): int
    {
        $this->validateFields($data);
        $data = $this->filterFields($data);