[英]'NoneType' object has no attribute 'username'
我目前正在从事一个项目,该项目将接收用户信息并存储它。 据我所知,存储数据没有问题,但是当我尝试访问管理页面上的用户部分时,它给了我这个错误:
AttributeError at /admin/users/profile/
'NoneType' object has no attribute 'username'
Request Method: GET
Request URL: http://127.0.0.1:8000/admin/users/profile/
Django Version: 2.2.10
Exception Type: AttributeError
Exception Value:
'NoneType' object has no attribute 'username'
Exception Location: /Users/ethanjay/Django Projects/opinions_app/users/models.py in __str__, line 28
Python Executable: /Users/ethanjay/Enviroments/py3/bin/python
Python Version: 3.7.4
Python Path:
['/Users/ethanjay/Django Projects/opinions_app',
'/Users/ethanjay/Enviroments/py3/lib/python37.zip',
'/Users/ethanjay/Enviroments/py3/lib/python3.7',
'/Users/ethanjay/Enviroments/py3/lib/python3.7/lib-dynload',
'/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7',
'/Users/ethanjay/Enviroments/py3/lib/python3.7/site-packages']
Server time: Fri, 28 Feb 2020 21:25:57 +0000
还有一些其他人发布了同样的错误,但我似乎无法理解他们的解决方案。 任何可以为我指明正确方向的帮助或建议将不胜感激!
模型.py
class Profile(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE, null=True, blank=True)
image = models.ImageField(default='default.jpg', upload_to='profile_pics')
gender = models.CharField(max_length = 1, choices = GENS, default = '')
birthday = models.DateField(default = '1900-01-01')
address = AddressField(on_delete=False, blank=True, null=True)
race = models.CharField(max_length = 2, choices = RACES, default = 'x')
ethnicity = models.CharField(max_length = 1, choices = ETHNICITIES, default = 'x')
income = models.CharField(max_length = 1, choices = INCBRACKET, default = 'x')
education = models.CharField(max_length = 2, choices = EDUCATION, default = 'x')
employment = models.CharField(max_length = 1, choices = EMPLOYMENT, default = 'x')
def __str__(self):
return f'{self.user.username} Profile'
def save(self, *args, **kawrgs):
super().save(*args, **kawrgs)
img = Image.open(self.image.path)
if img.height > 300 or img.width > 300:
output_size = (300, 300)
img.thumbnail(output_size)
img.save(self.image.path)
视图.py
def PII(request):
if request.method == 'POST':
form = PIIForm(request.POST,)
if form.is_valid():
form.save()
messages.success(request, f'Your account has been created! You are now able to log in')
return redirect('finalpii')
else:
form = PIIForm(request.POST)
return render(request, 'users/pii.html', {'form':form})
表格.py
class PIIForm(forms.ModelForm):
birthday = forms.DateField()
class Meta:
model = Profile
fields = [
'gender',
'birthday',
'address',
'race',
'ethnicity'
]
管理文件
from django.contrib import admin
from .models import Profile
admin.site.register(Profile)
由于您与用户模型的 oneToOne 关系可能为 null,您有时可能会收到此错误。 你有两个选择:
user = models.OneToOneField(User, on_delete=models.CASCADE, null=True, blank=True)
此外,您可能需要删除数据库,因为您将此字段设为不可为空,并且 db 中有一些行为空值。
if self.user:
return f'{self.user.username}'
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