[Django Rest框架]：如何在注册页面添加phone_number字段？

from django.contrib.auth.models import AbstractUser
from django.db import models

class User(AbstractUser):
    phone_number = models.CharField(max_length=20, blank=True, null=True)

from rest_framework import serializers
from .models import User

class UserSerializer(serializers.ModelSerializer):
    phone_number = serializers.CharField(required=False)

    class Meta:
        model = User
        fields = ['username', 'email', 'phone_number', 'password']

from rest_framework import generics
from .models import User
from .serializers import UserSerializer

class UserCreateView(generics.CreateAPIView):
    queryset = User.objects.all()
    serializer_class = UserSerializer

from django.urls import path
from .views import UserCreateView

urlpatterns = [
    path('api/register/', UserCreateView.as_view(), name='register'),
]