@webiny/api-headless-cms-ddb-es/operations/entry/dataLoader/getRevisionById.js

DynamoDB and Elasticsearch storage operations plugin for Headless CMS API.

import DataLoader from "dataloader";
import { createPartitionKey, createRevisionSortKey } from "../keys.js";
import { parseIdentifier } from "@webiny/utils";
import { createBatchScheduleFn } from "./createBatchScheduleFn.js";
export const createGetRevisionById = params => {
  const {
    entity,
    tenant,
    modelId
  } = params;
  return new DataLoader(async ids => {
    const reader = entity.createEntityReader();
    const keys = new Set();
    for (const id of ids) {
      const partitionKey = createPartitionKey({
        tenant,
        id
      });
      const {
        version
      } = parseIdentifier(id);
      if (version === null) {
        continue;
      }
      const sortKey = createRevisionSortKey({
        version
      });
      const key = `${partitionKey}__${sortKey}`;
      if (keys.has(key)) {
        continue;
      }
      keys.add(key);
      reader.get({
        PK: partitionKey,
        SK: sortKey
      });
    }
    const items = (await reader.execute()).map(item => {
      return item.data;
    });
    return ids.map(id => {
      return items.filter(item => {
        if (item.modelId !== modelId) {
          return false;
        }
        return id === item.id;
      });
    });
  }, {
    batchScheduleFn: createBatchScheduleFn()
  });
};

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