LIL-33. Add read only fields for CommentSerializer

api/v1/serializers/course.py

@@ -389,6 +389,13 @@ class CommentSerializer(serializers.ModelSerializer):
             'update_at',
         )
 
+        read_only_fields = (
+            'id',
+            'deactivated_at',
+            'created_at',
+            'update_at',
+        )
+
     def to_representation(self, instance):
         if isinstance(instance, CourseComment):
             return CourseCommentSerializer(instance, context=self.context).to_representation(instance)
@@ -407,6 +414,10 @@ class CourseCommentSerializer(serializers.ModelSerializer):
             'children',
         )
 
+        read_only_fields = CommentSerializer.Meta.read_only_fields + (
+            'children',
+        )
+
 
 class LessonCommentSerializer(serializers.ModelSerializer):
     author = UserSerializer()
@@ -418,3 +429,7 @@ class LessonCommentSerializer(serializers.ModelSerializer):
             'lesson',
             'children',
         )
+
+        read_only_fields = CommentSerializer.Meta.read_only_fields + (
+            'children',
+        )