如何在django restapi[POST]中编写将field1和field2的数据库值添加到field3中？

from rest_framework.decorators import api_view
from rest_framework.response import Response
from .models import YourModel

@api_view(['POST'])
def update_field3(request):
    field1_value = request.data.get('field1')
    field2_value = request.data.get('field2')

    # 查询数据库中的对象
    obj = YourModel.objects.first()

    # 更新field3的值
    obj.field3 = field1_value + field2_value
    obj.save()

    return Response("Field3 updated successfully.")