---
id: ML-176.1
title: "API: accept search query parameter on GET /api/v1/collection"
status: To Do
assignee: []
created_date: "2026-05-10 13:35"
labels:
  - api
  - backend
  - collection
milestone: m-0
dependencies: []
references:
  - lib/music_library/records/search.ex (FTS5 search implementation)
  - lib/music_library_web/controllers/collection_json.ex (response format)
modified_files:
  - lib/music_library_web/controllers/collection_controller.ex
parent_task_id: ML-176
priority: medium
---

## Description

<!-- SECTION:DESCRIPTION:BEGIN -->

Extend the existing `GET /api/v1/collection` endpoint to accept an optional `q` query parameter for full-text search.

When `q` is present and non-empty, pass it to `Collection.search_records/2` instead of the current empty-string default. When absent or empty, preserve existing behavior (return all collection records).

The existing FTS5 search in `Records.Search` handles the query — no new search logic is needed. It searches across all indexed fields (title, artists, genres) and supports the `artist:`, `album:`, etc. structured syntax, though the Presto client will only send plain text.

**Response format**: unchanged — the existing `CollectionJSON.index/1` already returns `{total, limit, offset, records}` with all fields the Presto needs.

**Key decisions** (from user):

- Collection-only scope (purchased_at IS NOT NULL) — already the default for this endpoint
- Alphabetical ordering — already the default
- Plain text query — passed as-is to FTS5
- Always returns paginated (limit/offset) — existing behavior
<!-- SECTION:DESCRIPTION:END -->

## Acceptance Criteria

<!-- AC:BEGIN -->

- [ ] #1 GET /api/v1/collection returns all records when q is absent (existing behavior unchanged)
- [ ] #2 GET /api/v1/collection?q=beatles returns only records matching FTS5 query for 'beatles'
- [ ] #3 GET /api/v1/collection?q= returns all records (empty string treated as no query)
- [ ] #4 GET /api/v1/collection?q=beatles&limit=5&offset=0 respects pagination with search
- [ ] #5 Response format matches existing schema: {total, limit, offset, records} with all record fields
- [ ] #6 Controller test covers: no q param, empty q, populated q, q with no matches, q with pagination
<!-- AC:END -->