fix(api): a track correction leaves alone what it does not mention - #184
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PATCH /api/v2/tracks/{track_id} replaced the whole set of corrections, so
a field left out was erased. A client correcting one field dropped every
other correction on the track, including ones another client had made —
reproduced in #177, not deduced.
It is now a partial patch with three states per field: absent leaves the
correction alone, null removes it, a value sets it. `{}` changes
nothing. A blank string still reads as null, and `[]` is still a value
for the two lists — a track that credits nobody.
Plain serde cannot say three states: an absent field and a null one
both deserialise to None, and that difference is the whole contract.
Every field is now Option<Option<T>> behind a small deserializer that
tells present from absent. The merge against the stored correction
happens under the writer gate, in the transaction, because merging
against a correction another writer has since replaced would write the
old one back.
No version header, because the audit of the one client that sends this
patch found nothing that depends on omission. The desktop's drain.rs
spells every field out, null included, so each of its requests keeps
its meaning field for field. What changes is that the three fields its
editor has no input for — sort_title, comment, musicbrainz_recording_id
— are left alone instead of erased, which is the bug. Its comments
justified the explicit nulls by wholesale semantics and would now invite
the one optimisation that breaks clearing, so they are corrected in
InstaZDLL/WaveFlow in the same move.
Tests cover absent, null and value for scalars and lists, the desktop's
request replayed as it is sent, a blank string, an out-of-range value
refusing the whole patch, and the last removal deleting the row. Three
existing tests relied on omission to clear and now send null. The
OpenAPI schema is locked: no field required, every field admits null —
a generated client that lost either would lose the contract.
Each half was proven by inversion. Reading absent as a removal failed
the three tests that keep what they do not mention; reading null as
absent failed the four that remove. One assertion was vacuous until an
inversion showed it: the list test's WAV credits nobody, so "went back
to the file" and "credits nobody" were both an empty list. It now uses
a file that credits somebody, and reading [] as a removal fails it.
GET /tracks/{track_id}/overrides stays. It is no longer needed to make a
write safe; it is still how an editor shows which fields are corrected.
Fixes #177
Claude-Session: https://claude.ai/code/session_019coGCzcX775GmG9kYz8fft
Signed-off-by: InstaZDLL <github.105mh@8shield.net>
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Path: .coderabbit.yaml Review profile: ASSERTIVE Plan: Advanced Run ID: 📒 Files selected for processing (2)
Included review availability: 7 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 10 reviews per hour. 📝 WalkthroughWalkthroughLe PATCH des métadonnées devient partiel. Les champs absents restent inchangés, ChangesCorrection partielle des métadonnées
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Client
participant API
participant TrackMetadataService
participant Database
participant TrackFile
Client->>API: PATCH /api/v2/tracks/{track_id}
API->>TrackMetadataService: décoder TrackMetadataPatch
TrackMetadataService->>Database: lire les corrections existantes
TrackMetadataService->>TrackFile: relire le fichier si une liste est supprimée
TrackFile-->>TrackMetadataService: valeurs restaurées
TrackMetadataService->>Database: fusionner et persister les corrections
Database-->>API: état transactionnel mis à jour
API-->>Client: réponse de la piste
Merge Risk: ⚪ Minimal · up to The partial metadata patch behavior preserves omitted corrections, supports explicit removal, and avoids writes for empty patches without weakening authorization. No current merge-blocking risk was identified. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Inline comments:
In `@src/services/track_metadata.rs`:
- Around line 211-222: In the track metadata update flow, short-circuit patches
that mention no fields so they perform no database write and do not call
record_library_event. Use the existing patch presence/field indicators around
the merge logic to detect an empty patch, while preserving normal merge, upsert,
and event behavior when any field is specified.
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docs/api-v2-guide.mdsrc/api/tracks.rssrc/services/mod.rssrc/services/track_metadata.rstests/native_api.rstests/service.rs
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The partial patch made `{}` a no-op in what it stored, and nowhere else.
It still took the writer gate, rewrote the override row with a fresh
updated_at, regenerated the track's search row, and recorded an upsert
on the library feed — so every client would refetch a track that had
not changed, and the guide's "`{}` changes nothing" was false. The test
compared only the correction values, which is why it passed.
A patch that mentions no field now returns before the gate. It is still
a request to correct the track, so the caller's role is checked the way
a real patch checks it: a listener sending `{}` gets 404, not a 200 that
answers differently from every other patch they send. The read happens
without the gate because there is no write for a revoked role to slip
in front of.
The test counts library feed events across `{}` and checks that a
sentinel updated_at survives — a sentinel, because comparing with the
previous write's stamp would pass whenever both land in the same
millisecond. A listener's `{}` is asserted to be refused.
Proven by inversion. Without the short-circuit, "and announces nothing"
fails. With it but without the role check, the listener's `{}` stops
being a 404.
Found by CodeRabbit on #184.
Claude-Session: https://claude.ai/code/session_019coGCzcX775GmG9kYz8fft
Signed-off-by: InstaZDLL <github.105mh@8shield.net>
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Summary
PATCH /api/v2/tracks/{track_id}becomes a real partial patch: a field absent leaves its correction alone,nullremoves it, a value sets it. Fixes #177, where a client correcting one field erased every other correction on the track — another client's included.Changes
TrackMetadataPatchfields areOption<Option<T>>behind apresentdeserializer, because plain serde reads an absent field and anullone as the sameNone.set_track_metadatamerges the patch over the stored correction under the writer gate, in the transaction. Only an explicitnulldrops a list and re-reads the file.null;[]is a value for the lists (credits nobody); removing the last correction deletes the override row.TrackMetadataPatch,TrackOverridesanddocs/api-v2-guide.mdstate the three states, with a{"year":null}example.required, every field typed[T, "null"].Why no version header
The one client that sends this patch was audited in
InstaZDLL/WaveFlow:remote/drain.rsbuilds the body with every field spelled out,nullincluded, so each request keeps its meaning field for field.sort_title,comment,musicbrainz_recording_id— go from erased to left alone. That is the bug, not a regression.None, sent asnull(remote/write.rs,correction()), so clearing a field still removes its correction.Its comments justified the explicit nulls by wholesale semantics, and read that way they invite the one optimisation that would break clearing: skipping
Nonefields. Corrected in the companion PR InstaZDLL/WaveFlow#607 — best merged after this one.Test plan
Run locally on Windows 11:
cargo fmt --all --checkcargo clippy --all-targets --all-features -- -D warningscargo test --all-features --lib— 49 passedcargo test --all-features --test native_api— 12 passed, two of them newcargo test --all-features --test service— 3 passed, schema lock includedwebapp/is untouchedProven by inversion, each one restored byte for byte before the next:
nullread as absent[]read as a removal{}without the short-circuit{}stops being a 404Notes
{}. They now sendnull, and{}is asserted to be a no-op: no write, no library feed event, and still refused to a listener. The first version still recorded anupserton the feed for it — found by CodeRabbit, fixed in 267b7c0.GET /tracks/{track_id}/overrides(feat: read a track's corrections and a library's members #183) stays. It is no longer needed to make a write safe; it is still how an editor shows which fields are corrected.By submitting this pull request, I confirm that my contribution is made under the terms of the AGPL-3.0-only license and is signed off via the Developer Certificate of Origin (
git commit -s).https://claude.ai/code/session_019coGCzcX775GmG9kYz8fft
Summary by CodeRabbit
Nouvelles fonctionnalités
nullou une chaîne vide supprime une correction, tandis qu’une liste vide reste une valeur explicite.Documentation