Bug: Quiz submission accepts empty answers, storing invalid quiz records

[anshul23102]

The quiz submission endpoint stores answer records without validating that answers are non-empty and properly formatted.

Problem: Empty answers accepted and persisted to database
Impact: Broken quiz analytics, invalid score calculations, data corruption

Solution: Validate all answers before database write:

• Check non-empty
• Check answer format matches expected type
• Validate against question options
• Return 400 if validation fails

Expected NSOC points: Level 2

Checklist:

• Not a duplicate
• Read CONTRIBUTING.md
• No em dashes or AI mentions

[Manav5234]

assign me under gssoc
i like to work on this

[Deepthii7]

Hi! I'm interested in investigating this issue and would like to work on it if it's available. I'll review the quiz submission flow and share my findings. Thanks!

[Dhyeya29]

Hi @MRIARC-08,

I'd be interested in working on this issue if it becomes available.

Proposed approach:

• Add server-side validation for quiz submissions
• Ensure answers are non-empty and correctly formatted
• Validate responses against question options before persistence
• Return appropriate 400 responses for invalid input

Thank you!

[MRIARC-08]

Assigned to @Dhyeya29.

Please keep the PR focused on this issue, mention "Closes #280" in the PR description, and share an update here if you need more time. I am balancing assignments across contributors, so please avoid picking up extra issues until this one is submitted or released.

[Dhyeya29]

Hi @MRIARC-08,

Just a quick update—I’ve started working on this issue as well and the implementation is underway. I’ll submit the PR soon. Thank you!

[Dhyeya29]

Hi @MRIARC-08,

I've completed the implementation for this issue and submitted a PR.

PR: #424

Thank you!