Fixes in event handling

eventplanner/serializers.py

@@ -9,8 +9,8 @@ class ParticipationSerializer(serializers.Serializer):
 
     event = serializers.PrimaryKeyRelatedField(queryset=Event.objects.all())
     user = serializers.CharField()
-    status = serializers.CharField(required=False, default="-")
-    comment = serializers.CharField(required=False, allow_blank=True, default="")
+    status = serializers.CharField(required=False)
+    comment = serializers.CharField(required=False, allow_blank=True)
 
     def to_representation(self, instance):
         """Serialize an EventParticipation instance."""
@@ -32,14 +32,19 @@ class ParticipationSerializer(serializers.Serializer):
         """Create or update EventParticipation based on event and user."""
         event = validated_data.get("event")
         user = validated_data.get("user")
-        status = validated_data.get("status", "-")
-        comment = validated_data.get("comment", "")
 
-        # Use update_or_create to handle both new and existing participations
+        # Only include fields that were actually present in the request,
+        # so a status-only update doesn't wipe the comment (and vice versa).
+        defaults = {}
+        if "status" in validated_data:
+            defaults["status"] = validated_data["status"]
+        if "comment" in validated_data:
+            defaults["comment"] = validated_data["comment"]
+
         participation, created = EventParticipation.objects.update_or_create(
             event=event,
             user=user,
-            defaults={"status": status, "comment": comment},
+            defaults=defaults,
         )
 
         return participation