diff --git a/task_app/serializers.py b/task_app/serializers.py
index a31d21f..e686121 100644
--- a/task_app/serializers.py
+++ b/task_app/serializers.py
@@ -4,26 +4,30 @@ from djangorestframework_camel_case.parser import CamelCaseJSONParser
 from .models import Task, SubTask, AssignedTask
 
 class SubTaskSerializer(serializers.ModelSerializer):
+    task = serializers.CharField(source='task.id')
+
     class Meta:
         model = SubTask
-        fields = ['id', 'title', 'status']
+        fields = ['id', 'title', 'status', 'task']
 
 class AssignedTaskSerializer(serializers.ModelSerializer):
+    user_id = serializers.CharField(source='user.id', read_only=True)
+
     class Meta:
         model = AssignedTask
         fields = ['user_id']
 
 class TaskSerializer(serializers.ModelSerializer):
-    assignees = serializers.SerializerMethodField()
     subtasks = SubTaskSerializer(many=True, read_only=True)
+    assignees = AssignedTaskSerializer(source='assigned_tasks', many=True, read_only=True)
 
     def get_assignees(self, obj):
         return list(obj.assigned_tasks.all().values('user_id'))
 
     class Meta:
         model = Task
-        fields = ['id', 'title', 'description', 'category', 'priority', 'status', 'date',
-                  'creator', 'created_at', 'subtasks', 'assignees']
+        fields = ['id', 'title', 'description', 'category', 'priority', 'status', 'date', 'creator', 'created_at', 'subtasks', 'assignees']
+        read_only_fields = ['id', 'creator', 'created_at']
 
     renderer_classes = [CamelCaseJSONRenderer]
     parser_classes = [CamelCaseJSONParser]
\ No newline at end of file
diff --git a/task_app/tests/test_serializers.py b/task_app/tests/test_serializers.py
index 9f1f8c6..4d5c262 100644
--- a/task_app/tests/test_serializers.py
+++ b/task_app/tests/test_serializers.py
@@ -24,6 +24,7 @@ class SerializerTests(TestCase):
             date=self.test_date,
             creator=self.user
         )
+
         self.subtask1 = SubTask.objects.create(task=self.task, title='SubTask 1', status=True)
         self.subtask2 = SubTask.objects.create(task=self.task, title='SubTask 2', status=False)
         self.assigned_user = User.objects.create(email='assigned@example.com')
@@ -31,12 +32,12 @@ class SerializerTests(TestCase):
 
     def test_subtask_serializer(self):
         serializer = SubTaskSerializer(self.subtask1)
-        expected_data = {'id': str(self.subtask1.id), 'title': 'SubTask 1', 'status': True}
+        expected_data = {'id': str(self.subtask1.id), 'title': 'SubTask 1', 'status': True, 'task': str(self.task.id)}
         self.assertEqual(serializer.data, expected_data)
-
+        
     def test_assigned_task_serializer(self):
         serializer = AssignedTaskSerializer(self.assigned_task)
-        expected_data = {'user_id': self.assigned_user.id}
+        expected_data = {'user_id': str(self.assigned_user.id)}
         self.assertEqual(serializer.data, expected_data)
 
     def test_task_serializer(self):
@@ -52,13 +53,14 @@ class SerializerTests(TestCase):
             'creator': self.user.id,
             'created_at': self.task.created_at.isoformat().replace('+00:00', 'Z'),
             'subtasks': [
-                {'id': str(self.subtask1.id), 'title': 'SubTask 1', 'status': True},
-                {'id': str(self.subtask2.id), 'title': 'SubTask 2', 'status': False}
+                {'id': str(self.subtask1.id), 'title': 'SubTask 1', 'status': True, 'task': str(self.task.id)},
+                {'id': str(self.subtask2.id), 'title': 'SubTask 2', 'status': False, 'task': str(self.task.id)}
             ],
-            'assignees': [{'user_id': self.assigned_user.id}]
+            'assignees': [{'user_id': str(self.assigned_user.id)}]
         }
+        
         self.assertEqual(serializer.data, expected_data)
-
+        
     def test_task_serializer_create_validation(self):
         data = {
             'title': 'New Task',