django中的用户模型没有扩展到其他模型

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

class CustomUser(AbstractUser):
    # 可以在这里添加额外的字段
    pass

class UserProfile(models.Model):
    user = models.OneToOneField(CustomUser, on_delete=models.CASCADE)
    avatar = models.ImageField(upload_to='avatars/', null=True, blank=True)
    bio = models.TextField(max_length=500, blank=True)

    def __str__(self):
        return self.user.username

AUTH_USER_MODEL = 'yourapp.CustomUser'

python manage.py makemigrations
python manage.py migrate

from django.db.models.signals import post_save
from django.dispatch import receiver
from .models import CustomUser, UserProfile

@receiver(post_save, sender=CustomUser)
def create_user_profile(sender, instance, created, **kwargs):
    if created:
        UserProfile.objects.create(user=instance)

@receiver(post_save, sender=CustomUser)
def save_user_profile(sender, instance, **kwargs):
    instance.userprofile.save()

# forms.py
from django import forms
from .models import UserProfile

class UserProfileForm(forms.ModelForm):
    class Meta:
        model = UserProfile
        fields = ['avatar', 'bio']

# views.py
from django.shortcuts import render, redirect
from .forms import UserProfileForm
from .models import CustomUser

def update_profile(request):
    if request.method == 'POST':
        form = UserProfileForm(request.POST, request.FILES, instance=request.user.userprofile)
        if form.is_valid():
            form.save()
            return redirect('profile')
    else:
        form = UserProfileForm(instance=request.user.userprofile)
    return render(request, 'update_profile.html', {'form': form})