⚡ Bolt: Optimize getPlaylistWithSongs with innerJoin

[Krosebrook]

💡 What: Refactored getPlaylistWithSongs in server/storage.ts to use a single innerJoin query instead of multiple queries and application-side mapping.
🎯 Why: Resolves an N+1 query bottleneck (technically 3 queries reduced to 2) and eliminates O(n) application-side loop overhead for mapping and sorting.
📊 Impact: Reduces database round trips by 33% (3 -> 2 queries) per playlist fetch. Ensures consistent ordering via DB-level sort.
🔬 Measurement: Verified type safety with pnpm check and code inspection.

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PR created automatically by Jules for task 17771203977942098943 started by @Krosebrook

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Summary by cubic

Refactored getPlaylistWithSongs to fetch songs with a single innerJoin, cutting DB round trips (3→2) and removing mapping loops. The query now enforces song order at the DB level.

• Refactors
  • Join songs with playlist_songs using getTableColumns(songs).
  • Filter by playlistId and order by playlist_songs.id.
  • Removed inArray and Map-based reconstruction.

^{Written for commit c9e1fde. Summary will update on new commits.}

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[gemini-code-assist]

Summary of Changes

Hello @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 playlist song retrieval by optimizing the database interaction. It moves from a multi-query, application-processed approach to a more efficient single-join query, thereby reducing database load and improving the speed of data assembly on the server.

Highlights

• Performance Optimization: Refactored the getPlaylistWithSongs function in server/storage.ts to utilize a single innerJoin query, replacing multiple database calls and application-side processing.
• Reduced Database Queries: Addressed an N+1 query bottleneck by reducing the number of database round trips from three to two when fetching a playlist's songs, resulting in a 33% reduction.
• Improved Application Efficiency: Eliminated O(n) application-side loop overhead previously used for mapping and sorting song data, improving server-side processing efficiency.
• Consistent Ordering: Ensured consistent song ordering by implementing a database-level sort within the optimized query.

Changelog

• server/storage.ts
  • Removed the inArray import as it is no longer needed for the optimized query.
  • Rewrote the getPlaylistWithSongs method to fetch songs using an innerJoin with playlistSongs table.
  • Eliminated the previous logic involving separate queries for playlistSongRows and songsResult, along with the songIds mapping and songMap creation.

Activity

• PR created automatically by Jules for task 17771203977942098943, initiated by @Krosebrook.

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[cubic-dev-ai]

No issues found across 1 file

[gemini-code-assist]

Code Review

The pull request successfully optimizes the getPlaylistWithSongs method by replacing a multi-query approach with a single innerJoin query. This refactoring reduces database round trips and eliminates unnecessary application-side mapping and filtering logic. The use of getTableColumns(songs) ensures type safety and maintains the expected return structure. The addition of an explicit orderBy clause also improves the consistency of the returned song list. The changes are clean, efficient, and follow the existing patterns in the codebase.

[Copilot]

Pull request overview

This PR optimizes the getPlaylistWithSongs method in the storage layer by replacing a pattern that used separate queries and application-side mapping with a single innerJoin query. The optimization reduces database round trips from 3 queries (get playlist, get song IDs, get songs) to 2 queries (get playlist, get songs with join), eliminating the N+1 query pattern and O(n) map/filter operations on the application side.

Changes:

• Refactored getPlaylistWithSongs to use innerJoin instead of inArray query pattern
• Removed unused inArray import from drizzle-orm
• Added database-level ordering to ensure consistent song order within playlists

[Copilot]

The query orders by playlistSongs.id which represents the auto-incremented primary key. However, the playlistSongs table has an addedAt timestamp field (line 74 of shared/schema.ts) that semantically represents when a song was added to the playlist.

Following the codebase convention established in getLikedSongs (line 143) which orders by songLikes.createdAt, and the stored memory that states "Order query results by timestamp fields (createdAt, addedAt) instead of ID fields for semantic correctness", this should order by playlistSongs.addedAt instead.

While ordering by id will usually give chronological results due to auto-increment, using the semantic timestamp field is more correct and guards against edge cases where IDs might be reused or assigned out of order.

Suggested change

	.orderBy(playlistSongs.id);
	.orderBy(playlistSongs.addedAt);