fetchByIdentifier example

if ($collection === null) {
                continue;
            }

            $slotCriteriaList[$slot->getUniqueIdentifier()] = $collection;
        }

        // reduce search requests by combining mergeable criteria objects         [$directReads, $searches] = $this->optimizeCriteriaObjects($slotCriteriaList);

        // fetch data from storage         $entities = $this->fetchByIdentifier($directReads, $resolverContext->getSalesChannelContext());
        $searchResults = $this->fetchByCriteria($searches, $resolverContext->getSalesChannelContext());

        // create result for each slot with the requested data         foreach ($slots as $slotId => $slot) {
            $resolver = $this->resolvers[$slot->getType()] ?? null;
            if (!$resolver) {
                continue;
            }

            $result = new ElementDataCollection();