[fix]

backend/project/api/events/serializers.py

@@ -1,18 +1,9 @@
 from rest_framework import serializers
 
-from api.events.models import Event, Tree
+from api.events.models import Event
 
 
 class EventSerializer(serializers.ModelSerializer):
-    tree = serializers.JSONField(write_only=True)
-
     class Meta:
         model = Event
         fields = "__all__"
-
-    def create(self, validated_data):
-        tree = Tree.objects.get_or_create(pk=validated_data.pop("tree"))
-
-        validated_data["tree"] = tree.id
-
-        return Event.objects.create(**validated_data)