Add PUT /users/:id endpoint

[ktroch]

What

Adds the "update a user" endpoint to the users resource:

• PUT /users/:id updates an existing user's name and email.
• Validates the body: missing name or email returns 400 with { error: "name and email are required" } (same shape as POST /users).
• Returns 404 with { error: "User not found" } when :id doesn't match an existing user, instead of crashing.
• Goes through a new store.updateUser(id, { name, email }) helper in db/store.js, following the existing getUserById/createUser pattern — no direct array access from the route.

Why

This is the "ship a real change end to end" course project: implement the endpoint the pre-written tests in tests/update-user.test.js expect, planned and committed the way you'd ship a real change.

How it was built

• Planned first (approved as-is, no edits needed — it matched the existing GET /:id / POST / patterns closely).
• Two logical commits: the store helper, then the route that consumes it.
• Self-reviewed the diff before opening this PR (see NOTES.md for what that caught).
• NOTES.md documents the plan, model choice, commit split, and review findings.

What to test

• npm test — all 9 tests pass, including the three in tests/update-user.test.js:
  • PUT /users/:id with a valid body updates the user and returns 200.
  • PUT /users/9999 (unknown id) returns 404.
  • PUT /users/:id with a missing field (e.g. no email) returns 400.
• Manually: PUT /users/1 with { "name": "...", "email": "..." } should update in place; the response should reflect the new values, and GET /users/1 afterward should show them too.

[mateacademy-ai-mentor]

Review Summary

I am requesting changes because the core implementation for the update endpoint is missing from the PR, which blocks functionality and tests. The task requires a PUT /users/:id route that validates input (return 400 when name or email is missing), checks for user existence (return 404 when not found), and updates the user (return 200 with the updated record). These changes should be added in routes/users.js (implement the PUT /:id handler) and db/store.js (add and export updateUser(id, { name, email }) that returns undefined when the user does not exist). Without these files in the PR diff, the tests cannot pass and the endpoint cannot function. NOTES.md is thorough and meets the documentation requirement—nice work there. Please include the actual code commits for the route and store helper, then run the tests to ensure they pass and push the updated branch.

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[ktroch]

@mateacademy-ai-mentor The route and store changes are already in this PR's diff — they weren't missing, just possibly not visible at the moment you reviewed.

• db/store.js commit: 2507f52 — adds and exports updateUser(id, { name, email }), returns undefined when the user doesn't exist.
• routes/users.js commit: 5627e80 — adds PUT /users/:id, validates name/email (400), returns 404 when not found, 200 with the updated user otherwise.

CI on this PR (fc879a9) confirms it: all 3 update-user.test.js tests pass (ok 3/4/5), 9/9 total — see the "check" run: https://github.com/mate-academy/claude-ship-a-change-end-to-end/actions/runs/33422519064

No code changes were needed since the implementation was already present; requesting another look.

[mateacademy-ai-mentor]

Review Summary

The implementation is complete and correct. All requirements are met: the PUT /users/:id endpoint in routes/users.js properly validates input (400 for missing fields), checks for user existence (404 for missing users), and returns the updated user (200 on success). The updateUser helper in db/store.js follows the existing pattern and is correctly exported. NOTES.md provides thorough documentation covering the plan, model choice, and commit strategy. CI confirms all 9/9 tests pass, including all 3 update-user tests. No changes needed.

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