NoMethodError: undefined method `to_i' for an instance of ActionController::Parameters

I'll start by invoking the rca skill and reading the cluster file.

Let me load the Skill tool schema.

Now let me invoke the rca skill.

Let me set up my investigation. First, per the task instructions, I'll check the status-board and se

No active incident. `svc:` scope means normal RCA. Now search Datadog around last_seen and locate th

last_seen is 2026-07-24, outside the 14d retention window (today is 2026-08-04). Let me search Datad

I'll search Datadog for the recent occurrence and grep the tesla repo in parallel.

0 logs, as expected — last_seen (2026-07-24) is outside the 14d retention window. The message is a f

The error is a Rails-generic message. `to_i` called on `ActionController::Parameters` means code did

There are many candidate sites. `to_i` on `ActionController::Parameters` throws when a client sends

Let me check the two error-controller concerns to confirm `NoMethodError` is NOT rescued (→ falls th

Key finding: `NoMethodError` is NOT explicitly rescued. But `RuntimeError` is rescued at server_erro

This confirms the pattern: `panos#nearest` (`GET /api/v1/reviews/:review_key/panos/nearest`) checks

KST conversions: first_seen 2025-08-23T06:37:45Z → 2025-08-23 15:37 KST; last_seen 2026-07-24T02:09:

RCA report written. Per the task instructions, I will NOT modify the cluster frontmatter (the pipeli

Let me update memory with this episode for future reference.

Done. RCA report written to `content/docs/incidents/a21860c9-bf2b-4601-8047-ad862280f91b/rca.mdx`.

I need to load the StructuredOutput tool schema first.

RCA complete.

I'll start by loading the code-fix skill to follow its phases exactly.

Now invoking the code-fix skill.

Let me check for existing state and read the key inputs.

No existing state. Starting from Phase 0.

The selected fix is "단기 개선 (1주 이내)". It has two options:

Note: memory has an episode for this exact cluster (a21860c9). Let me check memory episodes and the

Category is `missing_validation`. Let me read the category guide and the cupixworks-api service memo

No episode file exists yet for a21860c9 (it's in MEMORY.md as an RCA note only). Let me check the se

Now let me look at the repo-mapping skill and read templates.

Target repo is **tesla**, base branch `develop`. Now let me read the templates.

Now let me examine the actual tesla code to plan the fix. The selected fix is "단기 개선 (1주 이내)" which

This is a good pattern. The RCA's short-term recommendation option 2 (low-cost) is a clean, minimal,

Now let me check the ordering: ClientErrorController and ServerErrorController rescue_from precedenc

ServerErrorController is included after ClientErrorController. Rails searches `rescue_from` handlers

Now let me determine the exact NoMethodError message format. The RCA cites two variants:

Ruby 3.3.7. In Ruby 3.3, the NoMethodError message format is `undefined method 'to_i' for an instanc

I now have everything to plan. I have a clean spec pattern to mirror. Let me create the state file (

Now Phase 2: the plan. Let me read the plan template.

Phase 3: Create Jira issue. Let me read the jira template and release state.

Now create the Jira issue. Rendered summary and description in Korean, no code snippets.

Created TSLA-13890. Now update the description with full RCA and add a remote link.

Update state: jira done, branch, phase preparing.

Phase 4: Prepare worktree for tesla (base branch develop, not a monorepo → no sparse checkout; copy

Worktree Setup for tesla = copy `.env`. Install = `bundle install`. Per service memory, native gems

No `.env` in source — skip. Since validation is diff-based (blind subagent) and I can only do `ruby

Phase 5: Implement. Editing the worktree copy of the controller concern.

Now add the `rescue_from NoMethodError` line and the handler method.

Now the spec. Let me update the worktree spec file.

Now validate syntax with `ruby -c` (native gems for rubocop/rspec unavailable per service memory).

Rubocop actually ran (a pre-hook rake task couldn't connect to MySQL, but rubocop itself completed):

No `# typed:` sigil → `typed: false` default, no strict typing to satisfy. Rubocop passed, syntax OK

Committed; pre-commit rubocop hook passed. Update state and record implementation metrics.

Phase 6: blind validation. Let me read the validator agent doc, validation template, and collect the

Now launch the blind validation subagent. I need the Task/Agent tool.

APPROVED. Let me confirm the validation file was written and update state.

Phase 7: Create PR. Read the PR template and push.

This creates a PR (shared-state action). This is the standard final step of the code-fix pipeline th

The pre-push hook ran rspec on changed files and **passed**. Now create the PR.

The remote URL format is `https://dev.azure.com/cupix/tesla/_git/tesla` (not the DefaultCollection f

Now render the PR body and create the PR. Background info from RCA, summary from plan.

PR #89595 created. Web URL: https://dev.azure.com/cupix/tesla/_git/tesla/pullrequest/89595

Now set `resolution: pr_created` in the cluster file. Note memory warns the `resolution` field is im

The cluster file has no `resolution` field (uses `status: approved`). Per memory, `resolution` is se

Now update service memory with the new pattern.

Now the summary.mdx.

Code-fix skill completed all phases for cluster `a21860c9`.