feat(dashboard): allow reordering virtual model targets via drag handle - #879
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Add a grip handle left of each target row's remove button. Drag a row onto another row (or focus the handle and use the arrow keys) to change its position. The full list is reorderable, including the primary target, so the failover priority and the round-robin queue order are editable for every strategy. The save payload already serializes targets in array order, so no backend change is needed.
Frontend: models-vm-target-reorder.test.js pins drag-and-move (insert- between, not swap), payload order after a reorder, reopen round-trip, and weight/provider-pin survival. Backend: TestUpsertVirtualModelTargetOrderRoundTrips pins that a reorder save stores and returns targets in exactly the order the editor sent.
After ArrowUp/ArrowDown the each block reuses the DOM node at the old index, so focus stayed on whatever model now occupies that slot. Track the requested focus index and move focus to the moved row's handle, so repeated arrows walk the same model through the list.
- drop fork-specific PR reference from contract test header - guard dragleave with relatedTarget containment (drop highlight no longer flickers between child elements) - trim over-long comments to match merged-PR norms - slicesEqual -> stdlib slices.Equal in the Go contract test - hoist draggable expression to one $derived const - consolidate moveFormTarget tests into the contract file - cover null/malformed form branches of the target helpers
The editor always numbered extra rows from 1, but flattenFormTargets skips an empty primary row: in a fresh/unsaved form (or after clearing the primary) UI index n mapped to flattened index n-1, so drops on the new/unsaved rows landed out of bounds and the move was silently dropped. Extras now start at 0 when the primary has no model, and the primary handle hides. enterVmTargetDrop also skips redundant writes so fast drags no longer re-render the list on every dragover event.
Prevent default on dragenter so browsers that require it allow the drop, and disable text selection on the handle so a fast grab-release cannot turn into a selection instead of a drag.
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Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughVirtual model targets can be reordered by drag-and-drop or keyboard arrows. The form preserves target order, weights, and provider pins. Tests verify ordering through save, retrieval, and list operations. Documentation and translations describe the controls. ChangesVirtual model target reordering
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to Reordering a zero-weight target may cause it to receive traffic after saving, changing routing behavior. This should be resolved or explicitly accepted before merge. Sequence Diagram(s)sequenceDiagram
participant Editor
participant VirtualModelEditorStore
participant FormHelpers
participant AdminAPI
Editor->>VirtualModelEditorStore: drag or move a target
VirtualModelEditorStore->>FormHelpers: reorder indexed targets
FormHelpers->>Editor: update primary and extra target fields
Editor->>AdminAPI: save virtual model
AdminAPI-->>Editor: return targets in saved order
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✅ Passed checks (4 passed)
Full details: Description checkExplanation The description is detailed, on-topic, and explains the change, behavior, implementation, tests, and follow-up work. It uses a TL;DR section instead of the template's required "## Description" heading, but the required information is present. Full details: Linked Issues checkExplanation The implementation satisfies issue [ Full details: Docstring CoverageExplanation Docstring coverage is 54.55% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 4 files. (2 skipped: 2 unsupported.)
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Actionable comments posted: 3
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Inline comments:
In `@web/dashboard/messages/pl.json`:
- Line 641: Update the models_move_target translation to replace “skup” with
precise Polish wording that instructs users to focus the move handle before
using the arrow keys, while preserving the drag-to-reorder guidance.
In `@web/dashboard/src/pages/models/VirtualModelEditor.svelte`:
- Around line 89-90: Update the primary row’s index binding in
VirtualModelEditor so it uses undefined when hasPrimary is false, while
retaining index 0 when the primary target is present; leave the extra-row
indexing unchanged.
In `@web/dashboard/src/pages/models/vmForm.js`:
- Line 97: Update the weight normalization in the VM form target construction
and aliasFormTargets to preserve numeric zero, defaulting only missing or blank
values to 1. Apply this consistently to primary and extra targets, and add
regression coverage confirming zero weights remain zero through moves and
reopening.
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docs/features/virtual-models.mdxinternal/admin/handler_virtualmodels_test.goweb/dashboard/messages/en.jsonweb/dashboard/messages/pl.jsonweb/dashboard/src/pages/models/VirtualModelEditor.svelteweb/dashboard/src/pages/models/VmTargetRow.svelteweb/dashboard/src/pages/models/virtualModelEditor.svelte.jsweb/dashboard/src/pages/models/vmForm.jsweb/dashboard/tests/models-vm-target-reorder.test.js
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Confidence Score: 4/5Not ready to merge until blank draft targets cannot disrupt populated target reordering. The affected drag path was reproduced using the production target movement and count helpers, with output showing the populated primary becomes blank and reorder controls disappear. Files Needing Attention: web/dashboard/src/pages/models/VirtualModelEditor.svelte needs to prevent blank extra targets from entering the drag flow; the associated movement and focus handling in web/dashboard/src/pages/models/virtualModelEditor.svelte.js should be kept consistent.
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Reviews (1): Last reviewed commit: "fix(dashboard): harden drag gestures on ..." | Re-trigger Greptile |
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A newly added blank extra row was draggable whenever another target made canReorder true: dragging it onto a filled primary wrote the blank value into the primary slot and moved the former primary into an extra row, dropping the populated-target count to one and removing the handle from the moved row. Blank rows are no longer draggable; the primary row's index becomes undefined when the primary is empty so its div does not collide with the first extra row's index. Polish wording for models_move_target tightened. Added a contract test pinning that non-positive weights normalize to 1, matching the backend.
One-line docstrings on the four store methods the drag path added, restoring CodeRabbit's 80% docstring threshold on touched functions.
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Inline comments:
In `@web/dashboard/src/pages/models/VirtualModelEditor.svelte`:
- Line 101: Update the draggable condition in VirtualModelEditor so reordering
is enabled only when there are multiple populated targets, not merely multiple
entries counted by vmFormTargetCount(). Preserve the existing non-empty target
check and keep a single populated target non-draggable even when blank extra
rows exist.
In `@web/dashboard/src/pages/models/virtualModelEditor.svelte.js`:
- Line 124: Update resetVirtualModelForm() to clear vmDragIndex, vmDropIndex,
and vmFocusHandle along with the existing form state, ensuring
closeVirtualModelForm() cannot leave transient reorder or focus state for the
next form.
In `@web/dashboard/tests/models-vm-target-reorder.test.js`:
- Around line 165-174: Update the regression test around moveFormTarget to
include a negative primary or target weight while retaining the existing
zero-weight coverage, and change the weight-normalization helper to use an
explicit weight > 0 condition so negative and zero values normalize to 1.
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web/dashboard/messages/pl.jsonweb/dashboard/src/pages/models/VirtualModelEditor.svelteweb/dashboard/src/pages/models/virtualModelEditor.svelte.jsweb/dashboard/tests/models-vm-target-reorder.test.js
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…ormalization canReorder now counts only populated targets, so one filled target plus blank placeholder rows keeps the handle hidden. resetVirtualModelForm clears drag and focus state so closeVirtualModelForm cannot leak it into the next form. Weight normalization switched to an explicit weight > 0 condition: negative and zero weights normalize to 1, and a negative-weight regression case joins the contract test.
The grip handle lived next to the remove button on the right, where a fast drag could easily slip into a stray click on the trash. Moving it to the left edge of the row puts drag intent far from any destructive control, matching the maintainer feedback.
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Moved reorder field to left for better UX |
3 participants
TL;DR
The Virtual Model editor shows fallback targets in the order they were added. There is no way to change that order: users must delete and re-add targets to change the failover priority or the round-robin queue. Add a drag handle to each target row. Drag a row onto another row to move it. The full list is reorderable, including the primary target.
Files to review (9, +502 / -5):
web/dashboard/src/pages/models/VmTargetRow.svelte(start here)web/dashboard/src/pages/models/vmForm.jsflattenFormTargetsandmoveFormTarget.web/dashboard/src/pages/models/virtualModelEditor.svelte.jsvmDragIndex,vmDropIndex) and the drop action.web/dashboard/src/pages/models/VirtualModelEditor.svelteweb/dashboard/tests/models-vm-target-reorder.test.jsinternal/admin/handler_virtualmodels_test.godocs/features/virtual-models.mdxweb/dashboard/messages/en.json,pl.jsonmodels_move_targetlabel for the handle.Behavior
failover, position 1 is the first target the gateway tries. For balancing strategies, position 1 is the first slot in the queue.How
moveFormTargetsplices that list and writes the result back into the primary slot plus the extras array.dragenter/dragoverpreventDefaultsodropfires in every browser; text selection is disabled on the handle so a fast grab-release commits the drag. The drop target row is tracked invmDropIndexfor the highlight, written only on change to avoid re-render storms mid-drag.buildVirtualModelSavePayloadalready serializes targets in array order, and the backend reads that order as the failover priority / queue order.Contract tests
The behavior above is pinned so refactors cannot silently change it:
web/dashboard/tests/models-vm-target-reorder.test.js— insert-between move semantics (drop last onto first lands first, others keep relative order); payload lists targets in the new display order after a drag; reopening a reordered model restores the order; weights and provider pins survive; flattened-index alignment for empty and filled primaries; null/malformed form handling.TestUpsertVirtualModelTargetOrderRoundTrips(internal/admin/handler_virtualmodels_test.go) — a reorder PUT stores the targets in exactly the sent order, and the list view the dashboard renders returns the same order.Tests
npm testinweb/dashboard: 596 pass (6 in the reorder contract file).go test ./internal/admin/ ./internal/virtualmodels/: pass.gofmt -l: clean.go vet: clean.go build ./...: clean.ineffassign: clean.errcheck: clean on the touched files.npm run check: svelte-check reports 0 errors, 0 warnings.Follow-up
droponly fires oncedragover/dragenterarepreventDefaulted) is exactly whatnode:testcannot pin.Links
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Summary by CodeRabbit
New Features
Documentation