结合用户和个人资料时，signals.py 上的 AttributeError答案

【问题标题】：AttributeError on signals.py when combine user and profile结合用户和个人资料时，signals.py 上的 AttributeError
【发布时间】：2021-02-14 09:40:51
【问题描述】：

在signals.py中包含的注册模板表单上将用户与自定义配置文件结合起来以与用户模型同步。知识库提供了在 OnetoOneFiedld 上的 models.py 中添加 related_name 的解决方案，但问题仍然存在。

    AttributeError at /createuser
'User' object has no attribute 'profile'
Request Method: POST
Request URL:    http://127.0.0.1:8000/createuser
Django Version: 3.1.2
Exception Type: AttributeError
Exception Value:    
'User' object has no attribute 'profile'
Exception Location: D:\Dev\main0\main\accounts\signals.py, line 16, in update_profile
Python Executable:  D:\Dev\main0\venv\Scripts\python.exe
Python Version: 3.8.5
Python Path:    
['D:\\Dev\\main0\\main',
 'D:\\Dev\\main0\\venv\\Scripts\\python38.zip',
 'c:\\python38\\DLLs',
 'c:\\python38\\lib',
 'c:\\python38',
 'D:\\Dev\\main0\\venv',
 'D:\\Dev\\main0\\venv\\lib\\site-packages']
Server time:    Sun, 01 Nov 2020 14:34:42 +000

我试图找出错误的根本原因这是 Signals.py 文件

@receiver(post_save, sender=User) 
def create_profile(sender, instance, created, **kwargs):
    if created:
        Profile.objects.create(user=instance)


@receiver(post_save, sender=User) 
def update_profile(sender, instance, created, **kwargs):
    if created == False:
        instance.profile.save()

和views.py

def CreateUser(request):
if request.method == 'POST':
    first_name = request.POST['first_name']
    last_name = request.POST['last_name']
    username = request.POST['username']
    password = request.POST['password1']
    repassword = request.POST['password2']
    email = request.POST['email']

    if password == repassword:
        if User.objects.filter(username=username).exists():
            messages.error(request, f'User {username} already existed!!!')
            return redirect('register-page')
        elif User.objects.filter(email=email).exists():
            messages.error(request, f'email {email} already existed!!!')
            return redirect('register-page')
        else:
            user = User.objects.create_user(
                username=username, 
                password=password, 
                email=email, 
                first_name=first_name, 
                last_name=last_name
                )
            user.save()
            profile = Profile.objects.create(
                gender=gender,
                date_of_birth=date_of_birth,
                phone_number=phone_number,
                photo=photo
                )
            profile.user = user
            profile.save()           
            messages.success(request, f'User {username} has been created successfully!!')
            return redirect('main-users-page')
    else:
        messages.info(request,'password does not match')
        return redirect('register-page')
else:
    return render(request, 'registration/register.html')

【问题讨论】：

标签： django django-models django-views django-signals django-errors

【解决方案1】：

在signals.py上添加细节的解决方案

    @receiver(post_save, sender=User) 
def create_profile(sender, instance, created, **kwargs):
    if created:
        Profile.objects.create(user=instance)
        

    post_save.connect(create_profile, sender=User)
    
    @receiver(post_save, sender=User) 
    def update_profile(sender, instance, created, **kwargs):
        if created == False:
            instance.profile.save()
            print('Profile updated!!')
    
    post_save.connect(update_profile, sender=User)

【讨论】：