我以前使用from django.contrib.auth.models import User，但现在我需要切换到AbstractUser。如何将数据从上一个auth_user表传输到AbstractUser？我跟着code from here。
models.py

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

class User(AbstractUser):
    username = models.CharField(max_length=50, unique=True)
    email = models.CharField(max_length=100)
    password = models.CharField(max_length=100)

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

serializers.py

from .models import User
from rest_framework import serializers

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ['username', 'email', 'password']
        extra_kwargs = {
            'password': {'write_only': True} # Don't return password
        }

    def create(self, validated_data): # Hash password
        password = validated_data.pop('password', None)
        instance = self.Meta.model(**validated_data)
        if password is not None:
            instance.set_password(password)
        instance.save()
        return instance

当我登录到管理页面时，我得到：
无此类记录：API_user
我想在不删除auth_user表的情况下使用AbstractUser。