在Django REST框架中，如何调用序列化程序的validate方法并验证提交的必填字段？

from rest_framework import serializers

class MySerializer(serializers.Serializer):
    field1 = serializers.CharField(required=True)
    field2 = serializers.CharField(required=True)

    def validate(self, data):
        # 自定义验证逻辑
        if data['field1'] == data['field2']:
            raise serializers.ValidationError("field1和field2不能相同")
        return data

from rest_framework.views import APIView
from rest_framework.response import Response

class MyView(APIView):
    def post(self, request):
        serializer = MySerializer(data=request.data)
        if serializer.is_valid():
            # 验证通过，可以进行后续操作
            return Response(serializer.validated_data)
        else:
            # 验证失败，返回错误信息
            return Response(serializer.errors)