def submit_answer(self, request, pk=None):
""" Submit an answer to a question """
question = get_object_or_404(Question, pk=pk)
self.check_object_permissions(request, question)
question_history = QuestionHistory.objects.get(
student=request.user,
question=question
)
if question_history.status == QuestionHistory.AWAITING_RESULTS:
error = {
'status': False,
'detail': 'Please wait for some time'
}
return Response(error, status.HTTP_400_BAD_REQUEST)
if question_history.status == QuestionHistory.SOLVED:
error = {
'status': False,
'detail': 'Question already answered'
}
return Response(error, status.HTTP_400_BAD_REQUEST)
if question_history.answer_shown:
error = {
'status': False,
'detail': 'Correct answer already displayed'
}
return Response(error, status.HTTP_400_BAD_REQUEST)
if question_history.attempts >= question.attempts:
error = {
'status': False,
'detail': 'Exceeded the maximum number of attempts'
}
return Response(error, status.HTTP_400_BAD_REQUEST)
question_history.attempts += 1
attempts_remaining = question.attempts - question_history.attempts
serializer = serializers.AnswerSubmitSerializer(data=request.DATA)
if serializer.is_valid():
# Evaluate the submission and put in the submission
question_history.status = QuestionHistory.AWAITING_RESULTS
submission = Submission(
#course=question.course,
question=question,
student=request.user,
grader_type=question.grader_type,
answer=serializer.data['answer']
)
# Optimization: let the grader save the submission
# submission.save()
data = {
'status': submission.status,
'is_correct': submission.is_correct,
'result': submission.result,
'attempts_remaining': attempts_remaining
}
grader = Grader(submission=submission,
question=question,
question_history=question_history)
if grader.grade():
submission = grader.submission
data['status'] = submission.status
data['is_correct'] = submission.is_correct
data['result'] = submission.result
if attempts_remaining == 0 or submission.is_correct:
if grader.the_question is None:
the_question = Question.objects.get_subclass(
pk=submission.question.pk)
data['answer'] = \
the_question.get_answer(showToUser=True)
else:
data['answer'] = \
grader.the_question.get_answer(showToUser=True)
data['answer_description'] = question.answer_description
serializer = serializers.FrontEndSubmissionSerializer(data)
else:
serializer = serializers.FrontEndSubmissionSerializer(data)
# return the result of grading
return Response(serializer.data)
else:
question_history.save()
content = serializer.errors
return Response(content, status.HTTP_400_BAD_REQUEST)
def test_quiz_history_model(self):
submission = Submission.objects.get(pk=1)
self.assertEqual(submission.question, Question.objects.get(pk=1))
self.assertEqual(submission.student, self.student.user)
self.assertEqual(submission.answer, 'this is the answer')
self.assertEqual(submission.status, 'A')
grader = Grader(submission,None,None)
self.assertFalse(grader.grade())
self.assertEqual(submission.status, 'A')
with self.assertRaises(QuestionHistory.DoesNotExist):
QuestionHistory.objects.get(student=submission.student, question=submission.question)
submission = Submission.objects.get(pk=2)
grader = Grader(submission,None,None)
self.assertTrue(grader.grade())
self.assertEqual(submission.status, 'D')
self.assertEqual(submission.is_correct, False)
self.assertEqual(submission.result, 0.0)
question_hist = QuestionHistory.objects.get(student=submission.student, question=submission.question)
#Note : attempts not increased in grader or submission model
# self.assertEqual(question_hist.attempts, 1)
self.assertEqual(question_hist.status, 'O')
quiz_hist = QuizHistory(user=submission.student, quiz=Quiz.objects.get(pk=1))
self.assertEqual(quiz_hist.marks, 0.0)
submission = Submission.objects.get(pk=3)
grader = Grader(submission,None,None)
self.assertTrue(grader.grade())
self.assertEqual(submission.status, 'D')
self.assertEqual(submission.is_correct, True)
# marks not updated as depend on attempts
# self.assertEqual(submission.result, 2.0)
question_hist = QuestionHistory.objects.get(student=submission.student, question=submission.question)
self.assertEqual(question_hist.status, 'S')
# self.assertEqual(quiz_hist.marks, 2.0)
quiz_hist = QuizHistory(user=submission.student, quiz=Quiz.objects.get(pk=1))
# self.assertEqual(quiz_hist.marks, 2.0)
submission = Submission.objects.get(pk=4)
grader = Grader(submission,None,None)
self.assertTrue(grader.grade())
self.assertEqual(submission.is_correct, False)
question_hist = QuestionHistory.objects.get(student=submission.student, question=submission.question)
self.assertEqual(question_hist.status, 'O')
submission = Submission.objects.get(pk=5)
grader = Grader(submission,None,None)
self.assertTrue(grader.grade())
self.assertEqual(submission.is_correct, True)
question_hist = QuestionHistory.objects.get(student=submission.student, question=submission.question)
self.assertEqual(question_hist.status, 'S')
submission = Submission.objects.get(pk=6)
grader = Grader(submission,None,None)
self.assertTrue(grader.grade())
self.assertEqual(submission.is_correct, False)
question_hist = QuestionHistory.objects.get(student=submission.student, question=submission.question)
self.assertEqual(question_hist.status, 'O')
submission = Submission.objects.get(pk=7)
grader = Grader(submission,None,None)
self.assertTrue(grader.grade())
self.assertEqual(submission.is_correct, True)
question_hist = QuestionHistory.objects.get(student=submission.student, question=submission.question)
self.assertEqual(question_hist.status, 'S')