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date: 2025-07-26 topics: [nodejs, backend, devflow, testing, dsa] day: 10

📘 Day 10 – Answer Module: DONE & DUSTED 💥

✅ What I Worked On

🔨 Goal: Wrap up the Answer module in DevFlow
And that’s exactly what I did 👇

Task	Status
➕ Pending Service/Controller logic	✅ Completed
🔒 Ownership checks for delete/update	✅ Secured
📄 Finalized route-level documentation	✅ Documented
🧪 Unit tests for service/controller	✅ Added
📘 DSA revision: Sorting techniques	✅ Reviewed

🧠 Backend Highlights

✅ Service & Controller Logic

• Finished all remaining routes: create, update, getById, getAllByQuestion
• Services structured to return clean, validated responses

🔒 Ownership Checks (Security)

• Only authors can update or delete their answers:

if (answer.userId !== req.user.id) {
  throw new UnauthorizedError("Access denied");
}

Clean separation of logic: controller handles request, service enforces rules

📄 Route Documentation

• All routes now follow Swagger/JSDoc style:

/**
 * @route   PUT /api/v1/answers/:id
 * @desc    Update an answer
 * @access  Private
 */

🧪 Unit Testing Added

• Service layer covered with basic tests:

  • Create
  • Update with wrong user
  • Delete with ownership
  • Edge cases (e.g., non-existent answer)

📘 DSA Review – Sorting Techniques

• 🔁 Bubble Sort (swap until sorted)
• 🔢 Selection Sort (min each pass)
• 🪜 Insertion Sort (place where it fits)
• 🧠 Compared time complexity and stability

❌ Blockers

• Needed some tweaks to mock Mongoose methods in unit tests
• Minor bugs in middleware chaining for auth + validation (now resolved)

🧠 Reflection

This wasn’t just “finish the module.” It was about doing it right: clean code, secure access, test coverage, and docs.

Feeling confident in the structure of DevFlow’s backend now!

📸 Progress Snapshot

🔗 References / Code

• 💻 DevFlow GitHub Repo
• 💻 commit