在同一视图中创建两个实例时，Django OneToOne字段冲突

from django.db import models

class Person(models.Model):
    name = models.CharField(max_length=100)

class Profile(models.Model):
    person = models.OneToOneField(Person, on_delete=models.CASCADE)
    bio = models.TextField()

from django.shortcuts import render, get_object_or_404, redirect
from .models import Person, Profile
from .forms import ProfileForm

def create_profile(request, person_id):
    person = get_object_or_404(Person, id=person_id)
    
    if request.method == 'POST':
        form = ProfileForm(request.POST)
        if form.is_valid():
            profile = form.save(commit=False)
            if not hasattr(person, 'profile'):
                profile.person = person
                profile.save()
                return redirect('profile_detail', person_id=person.id)
            else:
                # 处理已经存在关联实例的情况
                form.add_error(None, 'Profile already exists for this person.')
    else:
        form = ProfileForm()
    
    return render(request, 'create_profile.html', {'form': form, 'person': person})