UserProfile模型不保存ForeignKeys

Question

我遵循以下指南：http://www.turnkeylinux.org/blog/django-profile它工作得很好，除了我似乎無法將ForeignKey保存到用戶配置文件。

模型

PCBuild模型

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

class PCBuild(models.Model): 
    name = models.CharField(max_length=50) 
    owner = models.ForeignKey(User) 

用戶配置模型

import datetime 
import md5 

from apps.pcbuilder.models import PCBuild 
from django.contrib.auth.models import User 
from django.db import models 

class UserProfile(models.Model): 
    user = models.OneToOneField(User) 
    email_hash = models.CharField(max_length=200) #MD5 hash of e-mail 

    current_build = models.ForeignKey(PCBuild, 
     related_name='current_build', null=True, blank=True) 

    def __unicode__(self): 
     return self.user.email 


User.profile = property(lambda u: UserProfile.objects.get_or_create(
          user=u, 
          email_hash=md5.new(u.email).hexdigest())[0]) 

的問題

>>> from django.contrib.auth.models import User 
>>> from apps.pcbuilder.models import PCBuild 
>>> from django.shortcuts import get_object_or_404 

>>> user = get_object_or_404(User, pk=2) 
>>> user 
    <User: Trevor> 

>>> pcbuild = get_object_or_404(PCBuild, pk=11) 
>>> pcbuild 
    <PCBuild: StackOverflowBuild> 

>>> pcbuild.owner 
    <User: Trevor> 

>>> user.profile.email_hash 
    u'd41d8cd98f00b204e9800998ecf8427e' 

>>> user.profile.current_build = pcbuild 
>>> user.profile.save() 
>>> user.profile.current_build 
    # nothing is stored/outputted - this is the problem! 

我是新來的Django，儘管谷歌一直樂於助人，到目前爲止，這個我還沒幾個小時後征服例。如果需要更多關於這個問題的信息，我會很樂意提供！

謝謝。

編輯：

事情我已經發現，可能是有用的（但並沒有解決我的具體問題）：

• https://docs.djangoproject.com/en/dev/topics/db/queries/#saving-foreignkey-and-manytomanyfield-fields

• http://sam.odio.com/blog/2008/05/extending-user-model-profiles-in-django.php

Answer 1

你會遇到神祕的錯誤使用該屬性。由於UserProfile至User的關係爲OneToOneField，因此可以通過執行user.userprofile從實例訪問配置文件實例。如果您想更改名稱，您可以更新OneToOneField的related_name屬性。當像這樣在創建用戶

使用信號來自動創建配置文件：

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

def create_profile(sender, **kwargs): 
    """Create a UserProfile instance when a User is created.""" 
    u = kwargs['instance'] 
    if kwargs['created']: 
     UserProfile.objects.get_or_create(
         user=u, 
         email_hash=md5.new(u.email).hexdigest()) 

post_save.connect(create_profile, sender=User) 

Answer 2

我想通了 - 但我打開其他答案仍然&將稍後檢查。我很確定它與我用來獲取配置文件的lambda函數有關。我在Python shell如何去一下吧：

>>> from django.contrib.auth.models import User 
>>> from apps.pcbuilder.models import PCBuild 
>>> from django.shortcuts import get_object_or_404 
>>> user = get_object_or_404(User, pk=2) 
>>> user 
    <User: Trevor> 

>>> pcbuild = get_object_or_404(PCBuild, pk=11) 
>>> pcbuild 
    <PCBuild: StackOverflowBuild> 

>>> user.profile.current_build 
    # nothing (which is expected as there is nothing 
    # yet in the current_build of this user profile) 


# NOTE: I'm creating a new "profile" variable that holds the user profile. 

>>> profile = user.profile 
>>> profile 
    <UserProfile: Trevor> 

>>> profile.current_build 
    # nothing (which is expected as there is nothing 
    # yet in the current_build of this user profile) 

>>> profile.current_build = pcbuild 
>>> profile.save() 

>>> user.profile.current_build 
    <PCBuild: StackOverflowBuild> 

    # As you can see, it worked! 

我基本上分配user.profile到它自己的變量（輪廓中的例子），然後修改變量，保存，與其後的用戶對象。

它似乎有點尷尬，但它的工作原理。