如何部分更新django rest框架中的模型类

# models.py
from django.db import models

class MyModel(models.Model):
    field1 = models.CharField(max_length=100)
    field2 = models.IntegerField()
    field3 = models.BooleanField()

# serializers.py
from rest_framework import serializers
from .models import MyModel

class MyModelSerializer(serializers.ModelSerializer):
    class Meta:
        model = MyModel
        fields = ['field1', 'field2', 'field3']

# views.py
from rest_framework.views import APIView
from rest_framework.response import Response
from .serializers import MyModelSerializer
from .models import MyModel

class MyModelView(APIView):
    def patch(self, request, pk):
        instance = MyModel.objects.get(pk=pk)
        serializer = MyModelSerializer(instance, data=request.data, partial=True)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        return Response(serializer.errors, status=400)