49 lines
2.1 KiB
Markdown
49 lines
2.1 KiB
Markdown
---
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id: 71256008-18b8-4206-a036-909fe11ce901
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type: workflow
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title: "PR review: paper-dynasty-database#45 — batch BattingCard/BattingCardRatings lookups (APPROVED)"
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tags: [pr-reviewer, paper-dynasty-database, python, peewee, performance, batch-query, sqlite]
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importance: 0.4
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confidence: 0.8
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created: "2026-03-03T23:48:28.060018+00:00"
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updated: "2026-03-03T23:48:28.467508+00:00"
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relations:
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type: RELATED_TO
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direction: outgoing
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strength: 0.72
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type: RELATED_TO
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direction: outgoing
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strength: 0.72
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edge_id: ef594550-29a0-4130-aceb-ef7d88ad1fae
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---
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## PR #45 — fix: batch BattingCard/BattingCardRatings lookups in lineup builder
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**Verdict:** APPROVED (could not post — Gitea blocks self-review)
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**Files reviewed:** `app/routers_v2/teams.py`
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**What the PR does:**
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- Before the position loop in `get_team_lineup`, batch-fetches all `BattingCard` rows for `legal_players ∪ backup_players` in one query
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- Batch-fetches all `BattingCardRatings` for those cards in a second query
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- Builds `_batting_cards_by_player` (player_id → BattingCard) and `_ratings_by_card_hand` (card_id → {hand → BattingCardRatings}) dicts
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- Rewrites `get_bratings()` closure to do O(1) dict lookups instead of 3 DB queries per player
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**Key correctness checks:**
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- Dict keys match: `battingcard_id` (FK integer) in ratings dict == `this_bcard.id` in lookup
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- Error behaviour preserved: missing card/ratings still raises AttributeError (caught by callers)
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- Empty guard: `if _batting_cards_by_player else []` prevents empty IN clause
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- Passing BattingCard model instances to Peewee `<<` is valid; PK extraction is automatic
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**Pre-existing issues noted (out of scope):**
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- Dead code block lines 544-576 (old batch approach, commented out)
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- `get_bratings()` call at line 537 not wrapped in try/except
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