Support advanced aggregate pipeline to update outside the aggregate source

[elisap360]

Context

I needed to update a field on collection companies by filtering elements on group collection. With the current DataMigration architecture, the target collection must be the one we want to update. But in this case, it proved counter-productive, the join was too big and the script crashed.

Sample script

```ts import { MongoBulkDataMigration } from "@360-l/mongo-bulk-data-migration"; import { DataMigrationProcess } from "@backend/utils/env/load/script/datamigration"; import { $nex } from "@backend/utils/mongo/utils"; import type { Company } from "@backend/utils/mongo/definitions"; const MIGRATION_ID = "migration_20240527T110000Z-activateMagicLinkForNonCustomizedUrlCompanies"; const processHandler = new DataMigrationProcess({ name: MIGRATION_ID }, buildMigration); void processHandler.handleMigration(); export function buildMigration() { return new MongoBulkDataMigration({ db: global._mongoClient.db(), id: MIGRATION_ID, collectionName: "companies", projection: { loginWithMagicLink: 1 }, query: [ { "$lookup": { "from": "groups", "localField": "_id", "foreignField": "company", "as": "groups" } }, { "$project": { "loginWithMagicLink": 1, "rootGroup": { "$filter": { "input": "$groups", "as": "rootGroup", "cond": { "$eq": [ "others", "$$rootGroup.sys" ] } } } } }, { "$unwind": { "path": "$rootGroup" } }, { "$project": { "loginWithMagicLink": 1, "subdomain": "$rootGroup.subdomain", "url": "$rootGroup.url" } }, { "$match": { $or: [ { loginWithMagicLink: $nex }, { loginWithMagicLink: false } ], $and: [{ $or: [ { subdomain: $nex }, { subdomain: "" } ] }, { $or: [ { url: $nex }, { url: "" } ] } ] } } ], update: { $set: { loginWithMagicLink: true } } }); } ```

TO DO

• [ ] support update outside the aggregate source (it could be new parameters to indicate the source/destination collections)
• [ ] make it work with the rollback system

Sample script

```ts return new MongoBulkDataMigration({ db: global._mongoClient.db(), id: MIGRATION_ID, collection: { query: "groups", update: "companies", relatedIdKey: "company", // groups._id -> companies.company }, projection: { company:1, sys:1, subdomain:1, url:1 }, query: { sys: "others", $and: [...] }, update: async (group) => { const company = await companyRepository.fetchById(group.company, ["_id", "loginWithMagicLink"]); if (! company.loginWithMagicLink) { companyIdsToSave.push(company._id); await _db.companies.update(company._id, { $set: { loginWithMagicLink: true } }); } }) }); ```

[elisap360]

@pp0rtal I finally created a ticket ! I don't have a better idea than what you proposed, it would be very helpful already =)