Django Rest框架-如何处理带有订单字段的项的更新

from django.db import models

class Item(models.Model):
    name = models.CharField(max_length=100)
    order = models.ForeignKey(Order, on_delete=models.CASCADE)
    # 其他字段...

from rest_framework import serializers

class ItemSerializer(serializers.ModelSerializer):
    class Meta:
        model = Item
        fields = '__all__'

from rest_framework import generics

class ItemUpdateView(generics.UpdateAPIView):
    queryset = Item.objects.all()
    serializer_class = ItemSerializer

from django.urls import path

urlpatterns = [
    path('items/<int:pk>/', ItemUpdateView.as_view(), name='item-update'),
]