Backend Preparation for Assignment & Quiz Creation Integration

<h2>Backend Preparation for Assignment & Quiz Creation Integration</h2>

<h3>Is your feature request related to a problem?</h3>
<p>🔹 Frontend for creating/editing assignments and quizzes is complete. However, backend APIs and serializers need to be verified and prepped to ensure full compatibility with the current React JSX interface.</p>

<h3>Describe the solution you'd like</h3>
<p>✅ We need fully functional and integrated backend endpoints that support the following:</p>
<ul>
  <li>Creating, retrieving, updating, and deleting:
    <ul>
      <li>Assignments</li>
      <li>Quizzes linked to assignments</li>
      <li>Questions (SA/MC)</li>
      <li>Choices for MC questions</li>
      <li>Solutions for both MC and SA types</li>
    </ul>
  </li>
  <li>Consistent endpoint structure using <code>assignment_id</code>, <code>quiz_id</code>, and <code>question_id</code> as route parameters</li>
  <li>JSON validation in serializers for required fields</li>
  <li>Error handling for missing or invalid payloads</li>
  <li>Integration of permissions (admin/tutor only where needed)</li>
</ul>

<h3>Tasks Breakdown</h3>
<ul>
  <li>[x] Confirm all endpoint routes from <code>urls.py</code> are active and functional</li>
  <li>[ ] Validate all views return consistent response structures (<code>status</code>, <code>data</code>, <code>error</code>)</li>
  <li>[ ] Update serializers if needed to support nested object creation or validation</li>
  <li>[ ] Ensure choices are only accepted for MC questions and <code>short_answer_text</code> for SA</li>
  <li>[ ] Confirm all routes align with frontend fetch/post expectations</li>
  <li>[ ] Add necessary unit tests for:
    <ul>
      <li>Assignment creation</li>
      <li>Quiz creation under assignment</li>
      <li>Adding questions (SA/MC)</li>
      <li>Handling MC choices correctly</li>
      <li>Handling SA solutions cleanly</li>
    </ul>
  </li>
</ul>

<h3>Additional Context</h3>
<ul>
  <li>📌 Frontend: <code>AssignmentCreate.jsx</code> (React)</li>
  <li>📌 Backend:
    <ul>
      <li>Models: <code>Assignment</code>, <code>Quiz</code>, <code>Question</code>, <code>Choice</code>, <code>Solution</code></li>
      <li>Views: <code>AssignmentDetailView</code>, <code>QuizListCreateView</code>, etc.</li>
      <li>Serializers: <code>AssignmentSerializer</code>, <code>QuestionSerializer</code>, etc.</li>
    </ul>
  </li>
  <li>📌 Permissions: <code>IsAdminOrTutor</code> enforced for all create/update/delete endpoints</li>
</ul>

<h3>Priority & Impact</h3>
<p>⚡ <strong>High</strong> – This feature blocks full quiz/assignment UI functionality and frontend/backend testing.</p>


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Backend Preparation for Assignment & Quiz Creation Integration #164