@@ -8,7 +8,7 @@ class MessageSerializer(serializers.ModelSerializer):
     elapsed_time = serializers.DurationField(read_only=True)
     from_model = serializers.BooleanField(read_only=True)
     model = serializers.SlugField(
-        source='content_object.model', default=None, required=False
+        source='content_object.model', default=None, required=False, read_only=True
     )
     is_favourite = serializers.BooleanField(read_only=True)
     is_sent = serializers.BooleanField(read_only=True)