fix(client): use questionFrontendId for problem metadata & optimize topic attachment by shadowmkj · Pull Request #32 · shadowmkj/leetrs

shadowmkj · 2026-08-24T16:22:54Z

🎯 Fix problem ID mismatch & optimize topic tag attachment

Fixes: #14

Summary

Resolves a problem ID discrepancy between LeetCode's internal database ID (questionId) and the public-facing problem number
(questionFrontendId), ensuring generated file headers display the correct problem number while preserving submission judge
compatibility. Also optimizes topic tag merging from O(T × Q × P) to O(P + T × Q).
──────

Key Changes

• GraphQL & Models (src/client.rs, src/models/problem.rs):
• Added questionFrontendId to the questionData GraphQL query.
• Added question_frontend_id to problem.rs:44-55 with documentation detailing the distinction between internal DB ID and
public frontend ID.
• File Metadata (src/picker.rs):
• Updated code file header generation to use question_frontend_id (e.g. // id=1550 ... instead of internal // id=1677 ...
).
• Submission Safety (src/services/submission.rs):
• Documented that /submit/ and /interpret_solution/ payloads strictly require the internal question_id.
• Performance Optimizations (src/picker.rs, src/tui/widgets/filter_state.rs):
• Replaced O(T × Q × P) linear scanning with a O(P + T × Q) HashMap lookup in attach_topics.
• Cached static topic catalog parsing using std::sync::LazyLock.

Summary by CodeRabbit

Summary

Bug Fixes
- Generated solution metadata now uses the public problem number.
- Problem topics are assigned more reliably when listing and filtering problems.
- Problem data now preserves both public and internal identifiers for accurate submissions.
Performance
- Topic information loads more efficiently by avoiding repeated parsing.
Documentation
- Added clearer explanations of public problem numbers and internal identifiers.

…c topics

- Add `question_frontend_id` to the `Question` model to store LeetCode's public-facing problem number - Keep `question_id` for internal database IDs required by submission and test judge endpoints - Update code file generation in picker to display `question_frontend_id` in metadata headers - Add unit tests verifying correct deserialization of both ID fields

coderabbitai · 2026-08-24T16:23:04Z

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📝 Walkthrough

Walkthrough

The change adds questionFrontendId to question retrieval, updates the API return type, maps internal IDs to public IDs during topic enrichment, updates generated metadata, adds tests, and caches parsed topic data.

Changes

Question data flow

Layer / File(s)	Summary
Question identifier contract and usage `src/client.rs`, `src/models/problem.rs`, `src/models/mod.rs`, `src/picker.rs`, `src/services/submission.rs`	The GraphQL query and `Question` model now carry both internal and public identifiers. Problem-list retrieval returns an ID map. Generated metadata uses `question_frontend_id`, and submission comments document endpoint requirements.
Problem topic enrichment `src/picker.rs`	Problem loading and cache refresh pass the ID map to `attach_topics`. Topic IDs are translated before indexed lookup. Tests cover direct IDs and differing internal and frontend IDs.
Cached topic catalog `src/tui/widgets/filter_state.rs`	Topic parsing, filtering, and sorting occur once in a lazy static catalog. New filter states clone the cached catalog.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to 5c071

The PR updates problem metadata identifiers and optimizes topic attachment without any identified merge-blocking risk; it is merge-ready after normal checks and review.

Sequence Diagram(s)

sequenceDiagram
  participant LeetCodeClient
  participant Picker
  participant ProblemSummaries
  LeetCodeClient->>Picker: return summaries and internal-to-frontend ID map
  Picker->>ProblemSummaries: translate topic IDs
  Picker->>ProblemSummaries: attach topic tags by indexed lookup

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	The PR also changes question ID models, client APIs, submission comments, generated headers, and topic catalog caching beyond issue `#14`.	Split the question ID migration and topic catalog caching into separate issues or link the PR to requirements that cover those changes.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the ID correction and topic attachment optimization, which are the main changes in the pull request.
Linked Issues check	✅ Passed	The PR replaces linear topic searches with HashMap indexing and adds tests for direct and translated topic ID matching, satisfying issue `#14`.
Docstring Coverage	✅ Passed	Docstring coverage is 88.89% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 2 files.

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codecov · 2026-08-24T16:25:44Z

Codecov Report

❌ Patch coverage is 69.90291% with 62 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/client.rs	0.00%	57 Missing ⚠️
src/picker.rs	95.83%	5 Missing ⚠️

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Actionable comments posted: 2

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Inline comments:
In `@src/picker.rs`:
- Around line 103-109: Define and implement the migration policy for existing
generated files in the slug-based early-return flow: either update or validate
legacy headers using question_id, or explicitly document that
question_frontend_id metadata applies only to newly generated files. Ensure the
behavior is consistent for files skipped by the existing generation logic.
- Around line 250-262: Update attach_topics and its caller get_problem_list to
translate each questionTopicTags questionId from the internal question ID to the
corresponding frontend_question_id before looking it up in problem_map. Ensure
topics are attached only to the matching ProblemSummary when the identifiers
differ, and add a regression test covering unequal internal and frontend IDs.

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📒 Files selected for processing (6)

src/client.rs
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… attachment

shadowmkj · 2026-08-24T16:59:10Z

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shadowmkj · 2026-08-24T17:01:59Z

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shadowmkj · 2026-08-24T17:07:30Z

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shadowmkj · 2026-08-24T19:02:29Z

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- Guard against division by zero when calculating problem acceptance rates with zero submissions - Skip missing internal-to-frontend ID mappings instead of falling back to raw internal IDs - Update tests to explicitly provide ID mappings for problem tags

shadowmkj added 2 commits August 24, 2026 21:47

perf(picker): optimize topic attachment with hash map and cache stati…

87ac147

…c topics

coderabbitai Bot reviewed Aug 24, 2026

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Comment thread src/picker.rs

Comment thread src/picker.rs

shadowmkj added 2 commits August 24, 2026 22:16

docs(picker): document existing file preservation and migration policy

c8abae4

refactor(client): map internal question IDs to frontend IDs for topic…

5c07153

… attachment

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🎯 Fix problem ID mismatch & optimize topic tag attachment

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