self.field.rel.to.DoesNotExist尝试通过模型访问用户 [英] self.field.rel.to.DoesNotExist when trying to access user through model

问题描述

 从django.db导入
从django.contrib.auth.models import用户
 
 class TestModel（models.Model）：
 user = models.OneToOneField（User）
 
 def __unicode __（self）：
 returnValue [+ self.user +]; 
  

当我尝试测试这个但是我得到以下内容：

 >>> t = TestModel（）
>>> t 
追溯（最近的最后一次呼叫）：
文件< console>，第1行，< module> 
文件/Library/Python/2.7/site-packages/django/db/models/base.py，第373行，__repr__ 
u = unicode（self）
文件/ Users /lkatz/tmp/private/Projects/Web/rcos_portal/driver/models.py，第39行，__unicode__ 
 returnValue [+ self.user +]; 
文件/Library/Python/2.7/site-packages/django/db/models/fields/related.py，第343行，__get__ 
 raise self.field.rel.to.DoesNotExist 
 DoesNotExist 
  

解决方案

您没有传递用户实例到你的班级TestModel：

做这样的事情：

  from django.contrib.auth.models import User 
 
 us = User.objects.all（）[0] 
t = TestModel（user = us）
 t.save（）
 print t 
  

I am trying to extend my model to include User but without much luck.

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

class TestModel(models.Model):
    user = models.OneToOneField(User)

    def __unicode__(self):
        return "Value[" + self.user + "];"

When I try to test this however I get the following:

>>> t = TestModel()
>>> t
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/Library/Python/2.7/site-packages/django/db/models/base.py", line 373, in __repr__
    u = unicode(self)
  File "/Users/lkatz/tmp/private/Projects/Web/rcos_portal/driver/models.py", line 39, in __unicode__
    return "Value[" + self.user + "];"
  File "/Library/Python/2.7/site-packages/django/db/models/fields/related.py", line 343, in __get__
    raise self.field.rel.to.DoesNotExist
DoesNotExist

解决方案

You are not passing a User instance to your class TestModel:

do something like this:

from django.contrib.auth.models import User

us = User.objects.all()[0]
t = TestModel(user=us)
t.save()
print t

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