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feat(discover): show why each item is suggested

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Each suggestion now carries the followed artists (seeds) that surfaced it,
from DiscoverySeedContribution joined to the current watched roster (an
unfollowed seed drops out), highest-scoring seed first. /discover renders
"Similar to Arctic Monkeys, Coldplay +2" under each artist and album row —
both kinds key off the candidate's artistMbid, so an album inherits its
artist's seeds. web 187 tests.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Jonathan
2026-07-14 22:07:05 +02:00
parent 18a22db7fb
commit a47d37a787
5 changed files with 67 additions and 0 deletions
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web/src/app/api/discover/route.test.ts
+29
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@@ -21,4 +21,33 @@ describe("discover feed API", () => {
expect(body.albums.map((a: any) => a.album)).toEqual(["Rec"]);
expect(body.artists[0]).toMatchObject({ artistMbid: "a2", seedCount: 2, sources: ["listenbrainz"] });
});
it("annotates each suggestion with the followed-artist seeds that surfaced it", async () => {
await prisma.watchedArtist.createMany({
data: [
{ mbid: "seed-am", name: "Arctic Monkeys" },
{ mbid: "seed-cp", name: "Coldplay" },
{ mbid: "seed-gone", name: "Unfollowed" },
],
});
await prisma.discoverySuggestion.createMany({
data: [
{ kind: "artist", artistMbid: "cand1", artistName: "The Strokes", score: 0.9, seedCount: 2,
sources: ["listenbrainz"], secondaryTypes: [], dedupeKey: "artist:cand1:" },
{ kind: "album", artistMbid: "cand1", artistName: "The Strokes", rgMbid: "rgX", album: "Room on Fire",
score: 0.7, seedCount: 2, sources: ["listenbrainz"], secondaryTypes: [], dedupeKey: "album:cand1:rgX" },
],
});
await prisma.discoverySeedContribution.createMany({
data: [
{ candidateMbid: "cand1", candidateName: "The Strokes", seedMbid: "seed-am", score: 0.6, sources: ["listenbrainz"] },
{ candidateMbid: "cand1", candidateName: "The Strokes", seedMbid: "seed-cp", score: 0.3, sources: ["listenbrainz"] },
{ candidateMbid: "cand1", candidateName: "The Strokes", seedMbid: "no-such-seed", score: 0.9, sources: ["listenbrainz"] },
],
});
const body = await (await GET()).json();
// highest-scoring seed first; an unresolved/unfollowed seed is dropped
expect(body.artists[0].seeds).toEqual(["Arctic Monkeys", "Coldplay"]);
expect(body.albums[0].seeds).toEqual(["Arctic Monkeys", "Coldplay"]); // album inherits its artist's seeds
});
});