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WalkthroughAdds a planning document and implements bulk-fetch helpers for Tasks and TaskAnswers, refactors task result assembly to eliminate N+1 queries by loading data with IN queries and merging in-memory via a new mergeTaskAndAnswer helper, adds timing logs and guards for empty inputs. Changes
Sequence Diagram(s)sequenceDiagram
autonumber
participant Page as Workbook Page
participant TR as getTaskResultsByTaskId
participant TS as getTasksWithSelectedTaskIds
participant AN as getAnswersWithSelectedTaskIds
participant M as mergeTaskAndAnswer
Page->>TR: request(taskIds[], userId)
alt taskIds empty
TR-->>Page: []
else
TR->>TS: fetch Tasks by IN(taskIds)
TR->>AN: fetch Answers by IN(taskIds) & userId
TS-->>TR: Tasks[]
AN-->>TR: Answers[]
TR->>TR: build maps (taskById, answerByTaskId, statusById)
loop per taskId
TR->>M: mergeTaskAndAnswer(Task?, Answer?, statusById)
M-->>TR: TaskResult
end
TR-->>Page: TaskResult[]
end
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes Poem
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🧹 Nitpick comments (5)
docs/dev-notes/2025-10-13/fix-n-plus-1-query-for-prisma/plan.md (1)
13-17: Add languages to fenced code blocks (markdownlint MD040).Please annotate code fences with languages to satisfy linting and improve readability. Examples:
- Lines 13-17: use text
Node.js process exited with signal: 6 (SIGABRT) ...- Lines 56-60: use text
200個のPrismaクエリエンジン × 40-60MB/プロセス = 8GB〜12GB必要Similarly apply typescript, sql, bash where appropriate throughout the doc.
Also applies to: 56-60
src/lib/services/answers.ts (1)
23-44: Type the return, guard empty input, and consider selecting updated_at.
- Add an explicit return type to avoid type drift downstream.
- Early-return on empty selectedTaskIds to skip a no-op DB call.
- If future merges will use timestamps, include updated_at now.
Apply:
-export async function getAnswersWithSelectedTaskIds(selectedTaskIds: string[], userId: string) { - return await prisma.taskAnswer.findMany({ +export async function getAnswersWithSelectedTaskIds( + selectedTaskIds: string[], + userId: string, +): Promise<Array<Pick<TaskAnswer, 'task_id' | 'user_id' | 'status_id' | 'updated_at'>>> { + if (!selectedTaskIds?.length) return []; + return await prisma.taskAnswer.findMany({ where: { task_id: { in: selectedTaskIds }, user_id: userId, }, select: { task_id: true, user_id: true, status_id: true, + updated_at: true, }, }); }If you prefer not to expose updated_at, keep the select as-is but still add the explicit return type and early return.
Ensure a composite index exists on (task_id, user_id) to fully benefit from the combined filter.
src/lib/services/tasks.ts (1)
14-34: Tighten JSDoc, guard/normalize inputs, and verify return type compatibility.
- Fix JSDoc param name and stray backtick.
- Avoid duplicate IDs and skip empty queries.
- Confirm Tasks matches the selected projection.
Apply:
/** * Fetches tasks with the specified task IDs. - * @param taskIds - An array of task IDs to filter the tasks. + * @param selectedTaskIds - An array of task IDs to filter the tasks. * * @returns A promise that resolves to an array of Task objects. - * @note conditions: { task_id: { in: taskIds } }` for efficient filtering + * @note conditions: { task_id: { in: taskIds } } for efficient filtering */ export async function getTasksWithSelectedTaskIds(selectedTaskIds: string[]): Promise<Tasks> { - return await db.task.findMany({ + if (!selectedTaskIds?.length) return []; + const ids = Array.from(new Set(selectedTaskIds)); + return await db.task.findMany({ where: { - task_id: { in: selectedTaskIds }, // SQL: WHERE task_id IN ('id1', 'id2', ...) + task_id: { in: ids }, // SQL: WHERE task_id IN ('id1', 'id2', ...) }, select: { contest_id: true, task_table_index: true, task_id: true, title: true, grade: true, }, }); }Also, please verify that type Tasks equals the selected shape (or adjust to Pick<Task, 'contest_id' | 'task_table_index' | 'task_id' | 'title' | 'grade'>[]).
src/lib/services/task_results.ts (2)
191-229: Great N+1 elimination; align typing and minor robustness.
- Change answersMap construction to avoid forcing a broader type than the selected shape.
- Optionally dedupe taskIds before querying to cut noise.
- Consider chunking if ids can approach DB/driver param limits; keep current simple path for typical sizes.
Apply:
- const answersMap = new Map(answers.map((answer: TaskAnswer) => [answer.task_id, answer])); + const answersMap = new Map(answers.map((answer) => [answer.task_id, answer]));Optional:
- const taskIds = workBookTasks + const taskIds = Array.from( + new Set( + workBookTasks .map((workBookTask) => workBookTask.taskId) - .filter((id): id is string => id !== null && id !== undefined); + .filter((id): id is string => id !== null && id !== undefined), + ), + );And consider gating the console.log under a debug flag or using your logger to avoid prod noise.
243-266: Consider propagating updated_at when an answer exists.If answers include updated_at (see suggested change in answers.ts), set taskResult.updated_at accordingly to keep parity with other paths (e.g., getTaskResultsOnlyResultExists).
Example:
if (status) { taskResult.status_id = status.id; taskResult.status_name = status.status_name; taskResult.submission_status_image_path = status.image_path; taskResult.submission_status_label_name = status.label_name; taskResult.is_ac = status.is_ac; taskResult.user_id = userId; + if ((answer as any).updated_at) { + taskResult.updated_at = (answer as any).updated_at; + } }Prefer a proper AnswerSummary type over any-casts if you adopt this.
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docs/dev-notes/2025-10-13/fix-n-plus-1-query-for-prisma/plan.md(1 hunks)src/lib/services/answers.ts(1 hunks)src/lib/services/task_results.ts(4 hunks)src/lib/services/tasks.ts(2 hunks)
🧰 Additional context used
🪛 markdownlint-cli2 (0.18.1)
docs/dev-notes/2025-10-13/fix-n-plus-1-query-for-prisma/plan.md
13-13: Fenced code blocks should have a language specified
(MD040, fenced-code-language)
56-56: Fenced code blocks should have a language specified
(MD040, fenced-code-language)
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src/lib/services/task_results.ts (1)
287-298: LGTM on refactor to reuse mergeTaskAndAnswer.Keeps behavior while centralizing merge logic.
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docs/dev-notes/2025-10-13/fix-n-plus-1-query-for-prisma/plan.md(1 hunks)src/lib/services/answers.ts(1 hunks)src/lib/services/task_results.ts(4 hunks)src/lib/services/tasks.ts(2 hunks)
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- src/lib/services/answers.ts
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🔇 Additional comments (5)
docs/dev-notes/2025-10-13/fix-n-plus-1-query-for-prisma/plan.md (1)
1-740: Excellent planning document!This is a very thorough and well-structured planning document that clearly explains:
- The root cause analysis (N+1 queries causing memory exhaustion)
- The solution approach (bulk queries with IN clause)
- Implementation phases with clear checklists
- Success criteria and risk mitigation
- Detailed code examples and technical explanations
The documentation will be valuable for future reference and for other team members to understand the fix.
src/lib/services/task_results.ts (4)
191-200: Good defensive programming with early return.The early return for empty input prevents unnecessary database queries and potential errors downstream.
226-229: Excellent addition of performance logging.The duration logging will help monitor the performance improvement and detect any regressions in production.
287-298: Good refactoring to use shared helper.The refactoring eliminates code duplication and ensures consistent merge logic across the codebase.
202-209: Cannot locate bulk query functions or confirm selected fields.
Please verify thatgetTasksWithSelectedTaskIdsandgetAnswersWithSelectedTaskIdsexist intasks.tsandanswers.ts, respectively, and that they each select the required fields (contest_id,task_table_index,task_id,title,gradefor tasks;task_id,user_id,status_id,updated_atfor answers`).
docs/dev-notes/2025-10-13/fix-n-plus-1-query-for-prisma/plan.md
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src/lib/services/task_results.ts (2)
187-232: LGTM! Excellent N+1 resolution with bulk queries.The refactor successfully addresses the N+1 query problem:
- Type-safe filtering (lines 194-196): Proper type guard ensures only valid task IDs are processed
- Early return (lines 198-200): Prevents unnecessary queries when no tasks exist
- Bulk fetches (lines 203-204): Reduces 200 queries to 2 queries (99% reduction)
- O(1) lookup (lines 207-209): Map-based lookups for efficient in-memory merging
- Error handling (lines 215-218): Gracefully handles missing tasks with warning and continues
- Performance logging (lines 226-229): Enables monitoring of execution time in production
The implementation follows best practices for batch operations and maintains type safety throughout.
291-302: LGTM! Good refactor for consistency.The function now correctly delegates merge logic to the shared
mergeTaskAndAnswerhelper, ensuring consistent behavior withgetTaskResultsByTaskId. The deprecation note is appropriate for future bulk-only operations.Once the
updated_atbug inmergeTaskAndAnswer(line 264-266) is fixed, this function will automatically benefit from the correction.docs/dev-notes/2025-10-13/fix-n-plus-1-query-for-prisma/plan.md (1)
222-224: Inconsistency: Plan is correct, but implementation differs.The example code here correctly shows using
answer.updated_at:if (answer.updated_at) { taskResult.updated_at = answer.updated_at; }However, the actual implementation in
src/lib/services/task_results.ts(lines 264-266) incorrectly usesstatus.updated_at. Please ensure the implementation matches this correct pattern shown in your plan.
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plan.md の phase 2以降は、動作確認中です。
Summary by CodeRabbit
Bug Fixes
Refactor
Documentation