[Backend] As a logged-in user, I can submit my answers to the survey questions

[nkhanh44]

Why

The user can submit their answers to the survey questions.

Acceptance Criteria

The API endpoint /api/v1/responses is called with the following body:

{
  "survey_id": "{{survey_id}}",
  "questions": [
      {
          "id": "{{question_id}}",
          "answers": [
              {
                  "id": "{{answer_id}}"
              }
          ]
      },
      {
          "id": "{{question_id}}",
          "answers": [
              {
                  "id": "{{answer_id}}",
                  "answer": "My answer"
              }
          ]
      }
  ]
}

Unit tests are added and passed.

Resources

The API documentation is available on this publicly accessible Postman collection.