feat(data-view): lane per sort value in the timeline - #889
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Adds `lanePacking="one-per-field"` + `laneField`: every distinct value of a field gets its own lane, that value's cards packed by date within it, and a sub-lane only where two of its own cards genuinely overlap in time. A priority timeline reads as a High lane, a Medium lane and a Low lane. Lane order can't come from sorting (text sort gives High, Low, Medium), so it comes from a declared ranking: the new `DataViewField.groupOrder`, overridable per renderer with `laneOrder`. `groupOrder` also orders group sections in `groupData`, so one declaration ranks sections and lanes alike — both share the ordering rule in `orderBucketKeys` (declared, then first-seen, no-value last). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe DataView timeline now supports Sequence Diagram(s)sequenceDiagram
participant DataView
participant Timeline
participant LanePacker
DataView->>Timeline: provide sorted timeline data
Timeline->>Timeline: read active sort values
Timeline->>LanePacker: pack items by sort value
LanePacker-->>Timeline: return lane assignments
Timeline-->>DataView: render timeline lanes
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`lanePacking="one-per-field"` now lanes by whatever the view is sorted by instead of taking its own field and order props. The row model already arrives grouped and ranked by the sort, so lane membership and lane order both fall out of it: one vocabulary instead of three, and the Ordering control rebuilds lanes live. Ranking values that don't sort naturally (High/Medium/Low) is a numeric rank field you sort on — the docs demo does exactly that. Drops `laneField`, `laneOrder`, `packLanesByField`'s `order` option, and the content-keyed memo the inline `laneOrder` array needed. `groupOrder` stays, now scoped to group sections alone. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Inline comments:
In `@apps/www/src/content/docs/components/dataview/index.mdx`:
- Around line 519-520: Update the preceding ordering statement to replace
“exactly one place” with wording that accurately identifies both
lanePacking="one-per-row" and lanePacking="one-per-field" as modes where sorting
affects layout, while preserving the rest of the explanation.
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apps/www/src/components/dataview-demo.tsxapps/www/src/components/demo/demo.tsxapps/www/src/content/docs/components/dataview/demo.tsapps/www/src/content/docs/components/dataview/index.mdxapps/www/src/content/docs/components/dataview/props.tspackages/raystack/components/data-view/__tests__/group-data.test.tspackages/raystack/components/data-view/__tests__/order-bucket-keys.test.tspackages/raystack/components/data-view/__tests__/pack-lanes.test.tspackages/raystack/components/data-view/__tests__/timeline.test.tsxpackages/raystack/components/data-view/components/timeline.tsxpackages/raystack/components/data-view/data-view.types.tsxpackages/raystack/components/data-view/utils/index.tsxpackages/raystack/components/data-view/utils/order-bucket-keys.tsxpackages/raystack/components/data-view/utils/pack-lanes.tsx
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`one-per-field` said nothing about what a lane holds, and read literally it was wrong — a lane is a value, not a field, and there is no field prop any more. `one-per-sort-value` names both halves: the unit (one value) and where it comes from (the sort), which is the part a reader can't otherwise guess. Internals follow: packLanesByField → packLanesBySortValue, PackFieldLaneItem → PackSortValueLaneItem, fieldLanes → sortValueLanes, and the demo/test names. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
rsbh
changed the title
| // collapsing into one "[object Object]" bucket. | ||
| let laneKey: string | null = null; | ||
| if (fieldLanes) { | ||
| const value = original?.[laneField as string]; |
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A dotted accessorKey silently flattens the whole timeline
const value = original?.[laneField as string];
if (value == null || value === '') laneKey = null;This reads the field off the raw object. But TanStack understands dots as a path — @tanstack/table-core/core/column.js:31 does accessorKey.split('.'). And fieldsToColumnDefs hands it your key unchanged (utils/index.tsx:73).
So with accessorKey: 'meta.rank':
- Sorting works. TanStack digs into
meta.rankand sorts correctly. - Laning doesn't.
original['meta.rank']isundefined, so every row is treated as "has no value" and they all pile onto one lane.
I ran it with three rows of ranks 1/2/3. The list sorted correctly (B C A), and the timeline gave me:
lanes → { a: '0', b: '0', c: '0' }
The really unpleasant part: no warning fires. The check on line 563 only catches objects and functions. undefined goes down the value == null path on 562, so unlaned never increments and the warning on 583 stays quiet. I spied on console.warn — zero calls. So the timeline just looks wrong with nothing telling you why.
Fix: row is the loop variable on line 543, so it's already available:
const value = row.getValue(laneField as string);That gives you exactly what TanStack sorted on. It's also safe if the sort name has no matching column — getValue returns undefined rather than throwing (table-core/core/row.js:27-36).
I applied this locally and it works: ranks 1/2/3 land on lanes 0/1/2, and all 97 existing timeline tests still pass.
If you'd rather not change the lookup, then at least warn when every row comes back unlaned. Nobody means to do that.
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Real bug, fixed in 5a20a0e. Confirmed your reading in the installed table-core@8.9.2: column.js builds a deep accessorFn when the key contains a dot, so original["meta.rank"] is undefined for the exact key the sort used. Now reads row.getValue(laneField), which is what the sort saw, and getValue returning undefined for an unknown column (row.js:27-36) is what makes the no-column case safe rather than throwing.
Two additions beyond the fix:
- A test with
accessorKey: "meta.rank"and ranks 1/2/3 pins lanes 0/1/2. - The silent-collapse class of failure had a second entrance: a sort key matching no field at all still reads undefined on every row. That now warns too ("which matches no field"), with its own test. Worth noting the lanes there are
0,1,0,2rather than all-zero — one bucket, still sub-laned by date overlap.
| } | ||
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| let laneCount = 0; | ||
| for (const key of orderBucketKeys([...buckets.keys()])) { |
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Lanes ignore groupOrder, so the same field can order two different ways
for (const key of orderBucketKeys([...buckets.keys()])) {No second argument, so no declared order ever reaches lane packing. Compare with utils/index.tsx:123, where groupData does pass it:
for (const key of orderBucketKeys([...groupMap.keys()], field?.groupOrder)) {So if a field declares groupOrder: ['High', 'Medium', 'Low'] and is also the sorted-by field, you get two different orders out of one field:
| what you see | |
|---|---|
Lanes (one-per-sort-value) |
High, Low, Medium ← alphabetical, from the sort |
Sections (group_by on that field) |
High, Medium, Low ← from groupOrder |
I checked both against what actually renders.
This is also the exact scenario the comment in order-bucket-keys.tsx:19-21 says can't happen:
Shared by
groupData… andpackLanesBySortValue… so sections and lanes can never disagree about where a value sits.
Two ways to resolve it, either is fine:
a) Let lanes honour it too. Pass the declared order down from the call site at timeline.tsx:736:
packLanesBySortValue(items, undefined, field?.groupOrder)Then the comment becomes true, and the demo's priority field works on its own — no need for the parallel rank field.
b) Say lanes follow the sort, full stop. Then drop the orderBucketKeys call here entirely. With no order passed it's only doing "keep input order, put the empty bucket last", which is two lines inline. And fix the comment.
Right now it's neither — it looks like the two paths share an ordering rule, but they only share half of one. That's a leftover from eb0b3d3, back when laneOrder was still a prop.
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Took your option (b) in 5a20a0e: lanes follow the sort, full stop — that is the deliberate contract of the mode, so the code stayed and the comments were what needed fixing.
Kept the orderBucketKeys call, though: with no order argument it is still doing the empty-bucket-last half of the rule, which lanes do need. Both comments now say so explicitly — order-bucket-keys.tsx no longer claims sections and lanes "can never disagree", and packLanesBySortValue states that a field which is both grouped and sorted can rank its sections by groupOrder and its lanes by the sort, by design.
On (a) and the demo rank field: that was the earlier design and it was dropped on purpose — laneField/laneOrder existed for it and both were removed so the sort is the single vocabulary. So the demo keeps rank.
| }); | ||
| return { laidOutSections: list, laneCount: offset }; | ||
| }, [positionedSections, lanePacking]); | ||
| }, [positionedSections, lanePacking, fieldLanes]); |
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}, [positionedSections, lanePacking, fieldLanes]);laneField isn't in there. It works today because timedSections (line 587) does list it, so a change cascades down into a fresh positionedSections. But that's an invisible chain — if anyone ever restructures those memos, this breaks quietly. Just add laneField.
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Added in 5a20a0e. Agreed on the reasoning — the cascade through timedSections made it correct but invisible.
| groupMap.forEach((value, key) => { | ||
| // Section order: the field's declared `groupOrder` first, then undeclared | ||
| // values in first-seen order, then the empty (null-valued) bucket last. | ||
| for (const key of orderBucketKeys([...groupMap.keys()], field?.groupOrder)) { |
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This changes behaviour for people not using the new feature
The empty bucket (rows with no value) now always sorts last — including when the field declares no groupOrder at all. Before this PR, groupData used groupMap.forEach, which kept insertion order, so that bucket stayed wherever it first appeared.
Meaning: anyone grouping a DataView.List on a nullable field can see their section order move, without opting into anything. No test caught it because the new group-data.test.ts:77 locks in the new behaviour rather than comparing to the old.
we can add a line in the PR description, since there's no .changeset/ in this repo to carry it.
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Correct, and it is intentional — the empty bucket now sorts last whether or not groupOrder is declared, so section order can move for anyone grouping a DataView.List on a nullable field without opting in.
It is already in the PR description (the "Also: declared section order" paragraph, plus the note that this is the one non-additive change). I have expanded it to name the DataView.List impact directly rather than leaving it implied.
On the test: group-data.test.ts pins both paths deliberately — "puts rows with no value in the last section" for the declared-order case and "puts rows with no value last without a declared order too" for the case you flagged. You are right that neither compares against the old order, since the old order is what is being changed; the second test is there to make the change explicit rather than incidental.
| items: PackSortValueLaneItem[], | ||
| gapPx: number = DEFAULT_CARD_GAP_PX | ||
| ): PackLanesResult { | ||
| const lanes = new Array<number>(items.length).fill(0); |
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allocates the array before the empty-input return. Swap the two lines.
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Swapped in 5a20a0e — returns { lanes: [], laneCount: 0 } before allocating.
- Lane values now come from `row.getValue(...)` rather than `row.original[...]`. TanStack reads a dotted `accessorKey` as a path, so `original['meta.rank']` was undefined for the very key it sorted by — every row looked valueless and collapsed onto one lane, with no warning to explain it. - Warn when the sort key matches no field at all: same silent collapse, now named. - Name `laneField` in the lane-layout memo's deps instead of relying on the cascade through `timedSections`. - `packLanesBySortValue` allocates its lane array after the empty-input return, and completes the `fieldLanes` → `sortValueLanes` rename that a BSD `sed \b` silently skipped. - Correct two comments that claimed sections and lanes can never disagree about order. They can, by design: sections rank by `groupOrder`, lanes follow the sort. Only the empty-bucket-last half of `orderBucketKeys` is shared. - Docs: the Ordering section no longer says sort surfaces in "exactly one place". Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Description
Adds a third timeline lane packing mode: one lane per value of the sorted-by field.
Rows sharing a value share a lane, packed by date within it; a value only claims a sub-lane where two of its own cards genuinely overlap in time. So a timeline sorted by priority rank reads as a High lane, a Medium lane and a Low lane, and only the priority with concurrent work grows a second row.
The active sort does double duty: it picks the field lanes are built from and orders them. That means one vocabulary rather than a parallel set of lane props, and the Ordering control rebuilds lanes live.
Behaviour details
tableQuery.sort[0]. No sort in the query → falls back toauto(the root requiresdefaultSort, so this is a guard, not a mode).undefined,"", or a non-primitive (which also logs a dev warning) — share one lane, always last, wherever the sort would have placed them.1and"1"share a lane.group_byactive, each section gets its own lane set andcontext.laneIndexstays section-relative. Grouping by the sorted field is allowed and degenerates cleanly: a section already holds one value, so it renders as one lane plus sub-lanes on overlap.Also: declared section order
DataViewField.groupOrder?: string[]ranks group sections for every renderer that groups —['High', 'Medium', 'Low'], which text sorting can't produce. Values it doesn't list follow in first-occurrence order.groupDatapreviously emittedgroupMap.forEach, i.e. insertion order. Anyone grouping aDataView.List(or a timeline) on a nullable field will see that section move, whether or not they declaregroupOrder.group-data.test.tspins both the declared and undeclared paths.Sections and timeline lanes share only the empty-bucket-last half of the rule (
orderBucketKeys): sections rank bygroupOrder, lanes by the sort. One field that is both grouped and sorted can therefore order its sections and its lanes differently — that's the contract ofone-per-sort-value, and both call sites say so.New API
DataViewFieldgroupOrder?: string[]DataViewTimelinePropslanePacking: 'auto' | 'one-per-row' | 'one-per-sort-value'Additive apart from the null-section ordering change called out above.
Type of Change
How Has This Been Tested?
order-bucket-keys.test.ts(9) andgroup-data.test.ts(7) for section ordering, 11 inpack-lanes.test.tsforpackLanesByField(bucketing, sub-lane splits, differential againstpackLanesfor a single bucket, plus randomized no-overlap-within-a-lane and lanes-never-span-buckets invariants), 17 intimeline.test.tsx(lane assignment from the sort, direction flip, relaning when the sort field changes, rank-field ordering, dottedaccessorKeypaths, a sort key matching no field, null and non-primitive values, per-section lanes undergroup_by, virtualized culling).row.getValue(...), so a dottedaccessorKey(meta.rank) lanes on the same value TanStack sorted by; a sort key with no matching field warns instead of silently collapsing.tsc --noEmitclean on every file this branch touches, in the package and inapps/www(the repo's other pre-existing errors are unchanged).rank asc, no group bands, console clean.Checklist:
Screenshots (if appropriate):
Docs → DataView → Timeline → Lane packing carries a live demo (one lane per priority, sorted by rank, Ordering control left visible) alongside a mode-comparison table.
Related Issues
n/a
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