Implemented Solution model endpoint views.py, serializers.py, & urls.py

Author: EthanZ23

backend/apps/lessons/serializers.py

@@ -1,5 +1,5 @@
 from rest_framework import serializers
-from .models import Assignment, Quiz, Question, Choice
+from .models import Assignment, Quiz, Question, Choice, Solution
 
 
 class AssignmentSerializer(serializers.ModelSerializer):
@@ -35,4 +35,10 @@ class Meta:
 class ChoiceSerializer(serializers.ModelSerializer):
     class Meta:
         model = Choice
-        fields = ["id", "question", "choice_text", "is_correct"]
+        fields = ["id", "question", "choice_text", "is_correct"]
+
+
+class SolutionSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Solution
+        fields = ["id", "question", "choices", "short_answer_text"]

backend/apps/lessons/urls.py

@@ -4,14 +4,18 @@
     AssignmentCreateView,
     QuizListCreateView,
     QuizDetailView,
-    QuizQuestionListView,
+    QQuestionListView,
     QuestionCreateView,
     QuestionUpdateView,
     QuestionDeleteView,
     ChoiceListView,
     ChoiceCreateView,
     ChoiceUpdateView,
-    ChoiceDeleteView
+    ChoiceDeleteView,
+    SolutionDetailView,
+    SolutionCreateView,
+    SolutionUpdateView,
+    SolutionDeleteView
 )
 
 urlpatterns = [
@@ -27,7 +31,7 @@
          QuizDetailView.as_view(), name="quiz-detail"),
     # - QUIZ Questions
     path("assignments/<int:assignment_id>/quiz/<int:quiz_id>/questions/",
-         QuizQuestionListView.as_view(), name="quiz-question-list"),
+         QQuestionListView.as_view(), name="quiz-question-list"),
     path("assignments/<int:assignment_id>/quiz/<int:quiz_id>/questions/create/",
          QuestionCreateView.as_view(), name="question-create"),
     path("assignments/<int:assignment_id>/quiz/<int:quiz_id>/questions/<int:question_id>/update/",
@@ -43,5 +47,15 @@
     path("assignments/<int:assignment_id>/quiz/<int:quiz_id>/questions/<int:question_id>/choices/update/",
          ChoiceUpdateView.as_view(), name="choice-update"),
     path("assignments/<int:assignment_id>/quiz/<int:quiz_id>/questions/<int:question_id>/choices/delete/",
-         ChoiceDeleteView.as_view(), name="choice-delete")
+         ChoiceDeleteView.as_view(), name="choice-delete"),
+
+    # CRUD endpoints for Solutions
+    path("assignments/<int:assignment_id>/quiz/<int:quiz_id>/questions/<int:question_id>/solution/",
+         SolutionDetailView.as_view(), name="solution-detail"),
+    path("assignments/<int:assignment_id>/quiz/<int:quiz_id>/questions/<int:question_id>/solution/create/",
+         SolutionCreateView.as_view(), name="solution-create"),
+    path("assignments/<int:assignment_id>/quiz/<int:quiz_id>/questions/<int:question_id>/solution/update/",
+         SolutionUpdateView.as_view(), name="solution-update"),
+    path("assignments/<int:assignment_id>/quiz/<int:quiz_id>/questions/<int:question_id>/solution/delete/",
+         SolutionDeleteView.as_view(), name="solution-delete")
 ]

backend/apps/lessons/views.py

@@ -4,8 +4,8 @@
 from rest_framework import status
 from rest_framework.permissions import IsAuthenticated, IsAdminUser
 from .permissions import IsAdminOrTutor
-from .models import Assignment, Quiz, Question, Choice
-from .serializers import AssignmentSerializer, QuizSerializer, QuestionSerializer, ChoiceSerializer
+from .models import Assignment, Quiz, Question, Choice, Solution
+from .serializers import AssignmentSerializer, QuizSerializer, QuestionSerializer, ChoiceSerializer, SolutionSerializer
 
 
 # - Assignments:
@@ -130,10 +130,11 @@ def delete(self, request, assignment_id, quiz_id):
         quiz = self.get_object(assignment_id, quiz_id)
         quiz.delete()
         return Response({"status": "success", "message": "Quiz deleted"}, status=status.HTTP_200_OK)
+# --------------
 
 
 # - Quizzes and Questions:
-class QuizQuestionListView(APIView):
+class QQuestionListView(APIView):
     permission_classes = [IsAuthenticated]
 
     # Fetch/get all questions for a quiz
@@ -272,4 +273,76 @@ def delete(self, request, assignment_id, quiz_id, question_id):
             return Response({"error": "Question not found"}, status=status.HTTP_404_NOT_FOUND)
 
         Choice.delete_choices(question)
-        return Response({"status": "success", "message": "All choices deleted"}, status=status.HTTP_200_OK)
+        return Response({"status": "success", "message": "All choices deleted"}, status=status.HTTP_200_OK)
+# --------------
+
+
+# - Solutions:
+class SolutionDetailView(APIView):
+    permission_classes = [IsAdminOrTutor]
+
+    # Helper method to check if object is found or not
+    def get_object(self, question_id):
+        try:
+            # Assumes each question has one solution
+            return Solution.objects.get(question__id=question_id)
+        except Solution.DoesNotExist:
+            return None
+
+    # Retrieve a solution for a given question (Admin/Tutor only)
+    def get(self, request, question_id):
+        solution = self.get_object(question_id)
+        if not solution:
+            return Response({"error": "Solution not found"}, status=status.HTTP_404_NOT_FOUND)
+        serializer = SolutionSerializer(solution)
+        return Response({"status": "success", "data": serializer.data}, status=status.HTTP_200_OK)
+
+
+class SolutionCreateView(APIView):
+    permission_classes = [IsAdminOrTutor]
+
+    # Create a Solution for a given question (Admin/Tutor only)
+    def post(self, request, question_id):
+        question = Question.get_question(question_id)
+        if not question:
+            return Response({"error": "Question not found"}, status=status.HTTP_404_NOT_FOUND)
+
+        data = request.data.copy()
+        data["question"] = question_id  # Associate the solution with the question
+
+        serializer = SolutionSerializer(data=data)
+        if serializer.is_valid():
+            serializer.save()
+            return Response({"status": "success", "data": serializer.data}, status=status.HTTP_201_CREATED)
+        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
+
+
+class SolutionUpdateView(APIView):
+    permission_classes = [IsAdminOrTutor]
+
+    # Update the Solution for a given question (Admin/Tutor only)
+    def put(self, request, question_id):
+        try:
+            solution = Solution.objects.get(question__id=question_id)
+        except Solution.DoesNotExist:
+            return Response({"error": "Solution not found"}, status=status.HTTP_404_NOT_FOUND)
+
+        serializer = SolutionSerializer(solution, data=request.data, partial=True)
+        if serializer.is_valid():
+            serializer.save()
+            return Response({"status": "success", "data": serializer.data}, status=status.HTTP_200_OK)
+        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
+
+
+class SolutionDeleteView(APIView):
+    permission_classes = [IsAdminOrTutor]
+
+    # Delete the solution for a given question (Admin/Tutor only)
+    def delete(self, request, question_id):
+        try:
+            solution = Solution.objects.get(question__id=question_id)
+        except Solution.DoesNotExist:
+            return Response({"error": "Solution not found"}, status=status.HTTP_404_NOT_FOUND)
+
+        solution.delete()
+        return Response({"status": "success", "message": "Solution deleted"}, status=status.HTTP_200_OK)