⚡ Bolt: Optimize getPlaylistWithSongs with innerJoin#86
⚡ Bolt: Optimize getPlaylistWithSongs with innerJoin#86Krosebrook wants to merge 1 commit intomainfrom
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Replaced the N+1 query pattern (fetch playlist -> fetch IDs -> fetch songs) with a single join query. This reduces database round trips and ensures consistent ordering by playlist_songs.id. Also cleaned up unused imports (inArray) and added explicit `asc` ordering. Co-authored-by: Krosebrook <214532761+Krosebrook@users.noreply.github.com>
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Summary of ChangesHello @Krosebrook, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly enhances the performance of fetching playlist data by optimizing the Highlights
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Pull request overview
This PR optimizes the getPlaylistWithSongs method in the storage layer by replacing a 3-step query pattern with a single innerJoin operation. The optimization follows the same pattern used in getLikedSongs, reducing database round trips from 3 to 2 (one for playlist metadata, one for songs).
Changes:
- Refactored
getPlaylistWithSongsto useinnerJoininstead of fetching song IDs then fetching songs separately - Removed unused
inArrayimport from drizzle-orm - Added
ascimport to support ordering by join table
| const songsList = songIds.map(id => songMap.get(id)).filter((s): s is Song => !!s); | ||
| .innerJoin(playlistSongs, eq(songs.id, playlistSongs.songId)) | ||
| .where(eq(playlistSongs.playlistId, id)) | ||
| .orderBy(asc(playlistSongs.id)); |
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The ordering should use playlistSongs.addedAt instead of playlistSongs.id to maintain semantic correctness and consistency with other queries in the codebase. The playlistSongs table has an addedAt timestamp field specifically for tracking when songs were added. Using the auto-increment ID works but doesn't express the intent as clearly.
Compare with getLikedSongs (line 143) which orders by songLikes.createdAt rather than the ID field. Ordering by timestamp fields is the established pattern in this codebase for chronological ordering.
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Code Review
The pull request successfully optimizes the getPlaylistWithSongs method by refactoring it to use an innerJoin. This change reduces the number of database round trips from three to two, which is a significant improvement in efficiency. The implementation correctly maintains the insertion order of songs in the playlist and ensures type safety by using Drizzle's getTableColumns utility. The removal of the unused inArray import also keeps the codebase clean.
| const playlist = await this.getPlaylist(id); | ||
| if (!playlist) return undefined; | ||
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| const playlistSongRows = await db.select({ songId: playlistSongs.songId }) | ||
| .from(playlistSongs) | ||
| .where(eq(playlistSongs.playlistId, id)); | ||
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| const songIds = playlistSongRows.map(r => r.songId).filter(id => typeof id === 'number' && !isNaN(id)); | ||
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| if (songIds.length === 0) { | ||
| return { ...playlist, songs: [] }; | ||
| } | ||
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| const songsResult = await db.select() | ||
| // Optimized: Use innerJoin to fetch songs in a single query instead of fetching IDs then fetching songs | ||
| // Ordered by playlist_songs.id to maintain insertion order | ||
| const songsList = await db.select(getTableColumns(songs)) | ||
| .from(songs) | ||
| .where(inArray(songs.id, songIds)); | ||
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| const songMap = new Map(songsResult.map(s => [s.id, s])); | ||
| const songsList = songIds.map(id => songMap.get(id)).filter((s): s is Song => !!s); | ||
| .innerJoin(playlistSongs, eq(songs.id, playlistSongs.songId)) | ||
| .where(eq(playlistSongs.playlistId, id)) | ||
| .orderBy(asc(playlistSongs.id)); | ||
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| return { ...playlist, songs: songsList }; |
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While the current refactor is a great improvement (reducing queries from 3 to 2), you could further optimize this into a single database query using a LEFT JOIN. This would eliminate the initial getPlaylist call and handle both the playlist metadata and its associated songs in one round trip.
Example approach:
const rows = await db.select({
playlist: playlists,
song: songs
})
.from(playlists)
.leftJoin(playlistSongs, eq(playlists.id, playlistSongs.playlistId))
.leftJoin(songs, eq(playlistSongs.songId, songs.id))
.where(eq(playlists.id, id))
.orderBy(asc(playlistSongs.id));
if (rows.length === 0) return undefined;
const playlist = rows[0].playlist;
const songsList = rows.map(r => r.song).filter((s): s is Song => !!s);
return { ...playlist, songs: songsList };
⚡ Bolt: Optimize getPlaylistWithSongs with innerJoin
💡 What: Refactored
getPlaylistWithSongsinserver/storage.tsto useinnerJoininstead of a 3-step fetch process.🎯 Why: To remove an N+1 query pattern and reduce database round trips.
📊 Impact: Reduces DB queries for playlist fetching from 3 to 2 (1 for playlist, 1 for songs).
🔬 Measurement: Verified with
pnpm checkto ensure type safety. Code review confirmed the logic is sound.PR created automatically by Jules for task 9884891980698896815 started by @Krosebrook
Summary by cubic
Optimized getPlaylistWithSongs by replacing the N+1 pattern with a join-based songs fetch. This cuts DB round trips to 2 (playlist + joined songs) and preserves insertion order.
Written for commit 7e62997. Summary will update on new commits.
Summary by CodeRabbit