more fixes, AI

eventplanner/serializers.py

@@ -1,21 +1,48 @@
+from django.contrib.auth.models import User
 from rest_framework import serializers
 
 from .models import Event, EventParticipation
 
 
-class ParticipationSerializer(serializers.ModelSerializer):
-    event = serializers.PrimaryKeyRelatedField(queryset=Event.objects.all())
-    user = serializers.CharField(source="get_username", read_only=True)
-    status = serializers.CharField(required=False)
+class ParticipationSerializer(serializers.Serializer):
+    """Serializer for EventParticipation that handles username lookup."""
 
-    class Meta:
-        model = EventParticipation
-        fields = ("event", "user", "status", "comment")
+    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="")
+
+    def to_representation(self, instance):
+        """Serialize an EventParticipation instance."""
+        return {
+            "event": instance.event.pk,
+            "user": instance.user.username,
+            "status": instance.status,
+            "comment": instance.comment,
+        }
+
+    def validate_user(self, value):
+        """Look up user by username (case-insensitive)."""
+        try:
+            return User.objects.get(username__iexact=value)
+        except User.DoesNotExist:
+            raise serializers.ValidationError(f"User '{value}' does not exist")
 
     def create(self, validated_data):
-        # Remove the get_username source field as it's read-only
-        validated_data.pop("get_username", None)
-        return super().create(validated_data)
+        """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
+        participation, created = EventParticipation.objects.update_or_create(
+            event=event,
+            user=user,
+            defaults={"status": status, "comment": comment},
+        )
+
+        return participation
 
     def update(self, instance, validated_data):
         instance.status = validated_data.get("status", instance.status)