在Django Rest Framework的Serializer或ViewSet中使用事务(Transaction)进行并发处理。

代码示例：

1. Serializer中使用事务(Transaction)进行并发处理：

from django.db import transaction
from rest_framework import serializers

class SampleSerializer(serializers.ModelSerializer):
    # ... fields ...

    @transaction.atomic
    def create(self, validated_data):
        # ... create logic ...
        return instance

    @transaction.atomic
    def update(self, instance, validated_data):
        # ... update logic ...
        return instance

2. ViewSet中使用事务(Transaction)进行并发处理：

from django.db import transaction
from rest_framework import viewsets, mixins

class SampleViewSet(mixins.CreateModelMixin,
                    mixins.RetrieveModelMixin,
                    mixins.UpdateModelMixin,
                    viewsets.GenericViewSet):
    # ... queryset, serializer_class ...

    @transaction.atomic
    def create(self, request, *args, **kwargs):
        # ... create logic ...
        return response

    @transaction.atomic
    def update(self, request, *args, **kwargs):
        # ... update logic ...
        return response