fix: Importing of Slack files #38291

ghuls · 2026-01-22T09:26:41Z

Proposed changes (including videos or screenshots)

Fix setImportFileRocketChatAttachment, by first setting "attachements" to [] when it is undefined before trying to add attachments.

Issue(s)

#37058 (comment)

Steps to test or reproduce

Steps to reproduce:

Import Slack archive: users and channels
Fix MongoDB so imported messages show up in channels (otherwise channels look empty) as currently Slack import does not work properly at all. Multiple options:
- manually run commands in mongosh: No history loads after slack import #37058 (comment)
- Run Slack import after applying: fix: prevent null fields in Slack import breaking message history #37805
- Get the database migraton from fix: Add migration to remove null fields from Slack-imported messages #38090 running after the import to fix MongoDb database (same commands ran as in manual mongosh step.
After importing Slack messages go to Admin->Import and click Downloading pending files

Errors like this will be seen for every file that gets downloaded:

@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)? [2026-01-13T18:31:19.543Z] ERROR (Pending Files Importer/558597 on machine-01): Cannot apply $addToSet to non-array field. Field named 'attachments' has non-array type null
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?     err: {
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?       "type": "MongoServerError",
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?       "message": "Cannot apply $addToSet to non-array field. Field named 'attachments' has non-array type null",
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?       "stack":
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?           MongoServerError: Cannot apply $addToSet to non-array field. Field named 'attachments' has non-array type null
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?               at UpdateManyOperation.execute (/home/ghuls/.meteor/packages/npm-mongo/.6.16.1.1i7rrhnsm1ig++os+web.browser+web.browser.legacy+web.cordova/npm/node_modules/mongodb/src/operations/update.ts:192:32)
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?               at processTicksAndRejections (node:internal/process/task_queues:105:5)
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?               at tryOperation (/home/ghuls/.meteor/packages/npm-mongo/.6.16.1.1i7rrhnsm1ig++os+web.browser+web.browser.legacy+web.cordova/npm/node_modules/mongodb/src/operations/execute_operation.ts:283:14)
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?               at executeOperation (/home/ghuls/.meteor/packages/npm-mongo/.6.16.1.1i7rrhnsm1ig++os+web.browser+web.browser.legacy+web.cordova/npm/node_modules/mongodb/src/operations/execute_operation.ts:115:12)
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?               at Collection.updateMany (/home/ghuls/.meteor/packages/npm-mongo/.6.16.1.1i7rrhnsm1ig++os+web.browser+web.browser.legacy+web.cordova/npm/node_modules/mongodb/src/collection.ts:420:12)
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?               at IncomingMessage.<anonymous> (app/importer-pending-files/server/PendingFileImporter.ts:145:9)
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?       "errorLabelSet": {},
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?       "errorResponse": {
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?         "index": 0,
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?         "code": 2,
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?         "errmsg": "Cannot apply $addToSet to non-array field. Field named 'attachments' has non-array type null"
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?       },
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?       "index": 0,
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?       "code": 2
@rocket.chat/meteor:dsv: I20260113-19:31:19.788(1)?     }

Summary by CodeRabbit

Bug Fixes
- Ensures imported file attachments are properly initialized before being added, preventing missing or misprocessed attachments during import.
- Makes import attachment updates more reliable by enforcing a two-step initialization and update sequence.

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changeset-bot · 2026-01-22T09:26:46Z

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dionisio-bot · 2026-01-22T09:26:47Z

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coderabbitai · 2026-01-22T09:27:29Z

Walkthrough

setImportFileRocketChatAttachment in Messages.ts now performs two sequential database updates: first initializes attachments to an empty array where it's not an array, then sets rocketChatUrl/downloaded and adds the attachment.

Changes

Cohort / File(s)	Summary
Database Update Refactoring `packages/models/src/models/Messages.ts`	Replaced one atomic update with two sequential `updateMany` operations: (1) ensure `attachments` is an array (initialize to `[]`), (2) set rocketChat URL and `downloaded` flag and `$addToSet` the attachment

Sequence Diagram(s)

(omitted — change involves only application and database interactions)

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Suggested labels

stat: ready to merge, stat: QA assured

Suggested reviewers

MartinSchoeler

Poem

🐰 Two updates, two gentle hops I make,
First I clear the path, then records wake,
Arrays aligned where chaos lay,
A tidy trail for files today,
Hooray — the attachments find their way! 🎉

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix: Importing of Slack files' directly describes the main change—fixing Slack file importing by handling the attachments field initialization in the setImportFileRocketChatAttachment function to prevent MongoDB errors.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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Post copyable unit tests in a comment

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Errors (1)

I20260113-19: Request failed with status code 404

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coderabbitai

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@packages/models/src/models/Messages.ts`:
- Around line 739-751: The first updateMany currently uses { ...query,
attachments: undefined } which won't match documents where attachments is null;
change that filter to explicitly match missing or null attachments, e.g. replace
the first argument of updateMany (the { ...query, attachments: undefined }
object) with { ...query, $or: [ { attachments: { $exists: false } }, {
attachments: null } ] } so those docs get reset to [] before the subsequent
updateMany that $addToSet the attachment.

packages/models/src/models/Messages.ts

cubic-dev-ai

No issues found across 1 file

ghuls requested a review from a team as a code owner January 22, 2026 09:26

coderabbitai bot reviewed Jan 22, 2026

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packages/models/src/models/Messages.ts Show resolved Hide resolved

cubic-dev-ai bot reviewed Jan 22, 2026

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This was referenced Jan 22, 2026

fix: prevent null fields in Slack import breaking message history #37805

Open

No history loads after slack import #37058

Open

fix: Importing of Slack files

d6d24e2

ghuls force-pushed the fix/slack-import-files branch from acfab24 to d6d24e2 Compare January 22, 2026 14:31

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fix: Importing of Slack files #38291

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