Sandbox::https://github.com/RocketChat/Rocket.Chat/pull/43326

mrityunjay-pandey · 2026-10-30T01:53:17Z

Proposed changes

$type was compiled with dontIncludeLeafArrays, so the field's own array value was never checked and only its elements were. { foo: { $type: 'array' } } therefore did not match { foo: [1, 2] } or { foo: [] } and matched only nested arrays. MongoDB 3.6+ matches any array for $type: 'array'.

The array itself is now checked after its elements, as MongoDB does for $type. Elements come first, so a nested array still reports its index for a positional update ({ foo: [1, [2]] } → arrayIndices: [1]). Only $type: 'array'/4 can match an array value, so other types still match through the elements as before ({ $type: 'string' } matches [1, 'bar']).

Issue(s)

Closes #43325

Steps to test or reproduce

createPredicateFromFilter({ foo: { $type: 'array' } })({ foo: [1, 2] }); // false before, true after

Further comments

filter.spec.ts gets cases for 'array' and 4 (plain, empty and nested arrays, a scalar and an object containing an array), which fail on develop, one showing element types still match, and one for the reported index of a nested array. The whole mongo-adapter suite (221 tests) and tsc pass.

Summary by CodeRabbit

Bug Fixes
- Fixed client-side $type filters so array-valued fields match array type checks, including empty and nested arrays.
- Array type checks now distinguish arrays from scalar values and objects that contain arrays. Filters can also match supported types within array elements, and nested array matches report the correct index.

dionisio-bot · 2026-10-30T01:53:23Z

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changeset-bot · 2026-10-30T01:53:23Z

🦋 Changeset detected

Latest commit: 97f5fe2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@rocket.chat/mongo-adapter	Patch
@rocket.chat/meteor	Patch
@rocket.chat/core-typings	Patch
@rocket.chat/rest-typings	Patch

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coderabbitai · 2026-10-30T01:56:19Z

Walkthrough

The client-side Mongo adapter now checks array-valued fields when evaluating $type filters. Tests cover array types, string elements, and nested array indices. A patch changeset records the fix.

Changes

Array type matching

Layer / File(s)	Summary
Retain arrays during type matching `packages/mongo-adapter/src/filter.ts`, `packages/mongo-adapter/src/filter.spec.ts`, `.changeset/mongo-adapter-type-array.md`	Array expansion retains the leaf array after its expanded elements. `$type` tests cover `'array'`, numeric type `4`, empty and nested arrays, string elements, and nested array indices. The changeset records a patch release.

Priority: Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested labels: type: bug

Suggested reviewers: tassoevan

Merge Risk: Minimal · up to 97f5f

The array-type matching change is mergeable after normal checks; no actionable merge-blocking issue was established.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: matching `$type: 'array'` against array-valued fields in `mongo-adapter`.
Linked Issues check		Issue `#43325` requires `$type: 'array'` and `$type: 4` to match plain and empty array fields. `filter.ts` now keeps leaf arrays for `$type` and evaluates array elements before the array value. The `$ty…
Out of Scope Changes check		The supplied whole-PR evidence identifies changes in `filter.ts`, `filter.spec.ts`, and the package changeset. The source change directly implements issue `#43325`. The tests verify the required behavio…
Docstring Coverage		No eligible functions found in the changed files. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…

Full details: Linked Issues check

Explanation

Issue #43325 requires $type: 'array' and $type: 4 to match plain and empty array fields. filter.ts now keeps leaf arrays for $type and evaluates array elements before the array value. The $type matcher maps array to code 4 and getBSONType identifies arrays as code 4. filter.spec.ts covers plain, empty, and nested arrays, numeric code 4, element matching, and nested-array indices. The implementation and regression tests satisfy the linked coding requirements.

Full details: Out of Scope Changes check

Explanation

The supplied whole-PR evidence identifies changes in filter.ts, filter.spec.ts, and the package changeset. The source change directly implements issue #43325. The tests verify the required behavior and preserve element matching. The changeset documents the same fix. No unrelated change is established.

Full details: Docstring Coverage

Explanation

No eligible functions found in the changed files. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 0 functions across 2 files.

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Actionable comments posted: 1

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Inline comments:
Review comments at @packages/mongo-adapter/src/filter.ts:
- Line 109: Update expandArraysInBranches and its $type call path so array
elements are checked before the whole array for $type, while retaining the whole
array as a fallback. Preserve the existing ordering for operators such as $eq
and $in.

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Files selected for processing: 3

.changeset/mongo-adapter-type-array.md
packages/mongo-adapter/src/filter.spec.ts
packages/mongo-adapter/src/filter.ts

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harshbhx · 2026-10-30T04:26:44Z

The "elements first, array itself last" ordering is a good call, since it keeps the positional index for nested arrays, and the test for arrayIndices: [1] pins that down.

One question: MongoDB also allows an array of types, e.g. { $type: ['array', 'string'] }. Does the new leafArraysLast path handle that form, or was it already unsupported before this change? If it's out of scope, a note in the description would be enough.

fix(mongo-adapter): match $type 'array' against fields that are arrays

398db9b

dionisio-bot Bot added the community label Oct 30, 2026

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coderabbitai Bot added the type: bug label Oct 30, 2026

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Comment thread packages/mongo-adapter/src/filter.ts Resolved

fix(mongo-adapter): check a leaf array after its elements for $type

97f5fe2

coderabbitai Bot mentioned this pull request Oct 31, 2026

fix: match $type 'array' against fields that are arrays #43389

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fix(mongo-adapter): match $type 'array' against fields that are arrays - #43326

fix(mongo-adapter): match $type 'array' against fields that are arrays#43326
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