django.db.models.base.py中的meta.local_fields在哪里设置?

Question

我遇到了一个错误：
异常信息：(1110, "列 'about' 被指定了两次")

在查看Django的错误页面时，我发现对User模型的自定义似乎被添加了两次。

这个问题似乎出现在django/db/model/base.py的base_save()函数里：

values = [(f, f.get_db_prep_save(raw and getattr(self, f.attname) or f.pre_save(self, True))) for f in meta.local_fields]

这是Django错误页面显示的值：

values = [(<django.db.models.fields.CharField object at 0xa78996c>, u'kallie'),  
(<django.db.models.fields.CharField object at 0xa7899cc>, ''),   
(<django.db.models.fields.CharField object at 0xa789a2c>, ''),   
(<django.db.models.fields.EmailField object at 0xa789a8c>, u'kallie@email.com'),   
(<django.db.models.fields.CharField object at 0xa789b2c>, 'sha1$d4a80$0e5xxxxxxxxxxxxxxxxxxxxddadfb07'),   
(<django.db.models.fields.BooleanField object at 0xa789bcc>, False),   
(<django.db.models.fields.BooleanField object at 0xa789c6c>, True),   
(<django.db.models.fields.BooleanField object at 0xa789d2c>, False),   
(<django.db.models.fields.DateTimeField object at 0xa789dcc>, u'2010-02-03 14:54:35'),   
(<django.db.models.fields.DateTimeField object at 0xa789e2c>, u'2010-02-03 14:54:35'),   
# this is where the values from the User model customizations show up  
(<django.db.models.fields.BooleanField object at 0xa8c69ac>, False),   
(<django.db.models.fields.CharField object at 0xa8c688c>, None),  
(<django.db.models.fields.PositiveIntegerField object at 0xa8c69cc>, 1),   
(<django.db.models.fields.CharField object at 0xa8c69ec>, 'b5ab1603b2308xxxxxxxxxxx75bca1'),   
(<django.db.models.fields.SmallIntegerField object at 0xa8c6dac>, 0),   
(<django.db.models.fields.SmallIntegerField object at 0xa8c6e4c>, 0),   
(<django.db.models.fields.SmallIntegerField object at 0xa8c6e8c>, 0),   
(<django.db.models.fields.SmallIntegerField object at 0xa8c6ecc>, 10),   
(<django.db.models.fields.DateTimeField object at 0xa8c6eec>, u'2010-02-03 14:54:35'),   
(<django.db.models.fields.CharField object at 0xa8c6f2c>, ''),   
(<django.db.models.fields.URLField object at 0xa8c6f6c>, ''),   
(<django.db.models.fields.CharField object at 0xa8c6fac>, ''),   
(<django.db.models.fields.DateField object at 0xa8c6fec>, None),   
(<django.db.models.fields.TextField object at 0xa8cb04c>, ''),   
# at this point User model customizations repeats itself  
(<django.db.models.fields.BooleanField object at 0xa663b0c>, False),   
(<django.db.models.fields.CharField object at 0xaa1e94c>, None),   
(<django.db.models.fields.PositiveIntegerField object at 0xaa1e34c>, 1),   
(<django.db.models.fields.CharField object at 0xaa1e40c>, 'b5ab1603b2308050ebd62f49ca75bca1'),   
(<django.db.models.fields.SmallIntegerField object at 0xa8c6d8c>, 0),   
(<django.db.models.fields.SmallIntegerField object at 0xaa2378c>, 0),   
(<django.db.models.fields.SmallIntegerField object at 0xaa237ac>, 0),   
(<django.db.models.fields.SmallIntegerField object at 0xaa237ec>, 10),   
(<django.db.models.fields.DateTimeField object at 0xaa2380c>, u'2010-02-03 14:54:35'),   
(<django.db.models.fields.CharField object at 0xaa2384c>, ''),   
(<django.db.models.fields.URLField object at 0xaa2388c>, ''),   
(<django.db.models.fields.CharField object at 0xaa238cc>, ''),   
(<django.db.models.fields.DateField object at 0xaa2390c>, None),   
(<django.db.models.fields.TextField object at 0xaa2394c>, '')]  

因为这个应用正在生产环境中，我无法使用pdb.set_trace()来查看save_base内部发生了什么。

对User的自定义内容是：

    User.add_to_class('email_isvalid', models.BooleanField(default=False))  
    User.add_to_class('email_key', models.CharField(max_length=16, null=True))  
    User.add_to_class('reputation', models.PositiveIntegerField(default=1))  
    User.add_to_class('gravatar', models.CharField(max_length=32))  
    User.add_to_class('email_feeds', generic.GenericRelation(EmailFeed))  
    User.add_to_class('favorite_questions', models.ManyToManyField(Question, through=FavoriteQuestion, related_name='favorited_by'))                  
    User.add_to_class('badges', models.ManyToManyField(Badge, through=Award, related_name='awarded_to'))  
    User.add_to_class('gold', models.SmallIntegerField(default=0))  
    User.add_to_class('silver', models.SmallIntegerField(default=0))  
    User.add_to_class('bronze', models.SmallIntegerField(default=0))  
    User.add_to_class('questions_per_page', models.SmallIntegerField(choices=QUESTIONS_PER_PAGE_CHOICES, default=10))                             
    User.add_to_class('last_seen', models.DateTimeField(default=datetime.datetime.now))                     
    User.add_to_class('real_name', models.CharField(max_length=100, blank=True))  
    User.add_to_class('website', models.URLField(max_length=200, blank=True))  
    User.add_to_class('location', models.CharField(max_length=100, blank=True))  
    User.add_to_class('date_of_birth', models.DateField(null=True, blank=True))  
    User.add_to_class('about', models.TextField(blank=True)) 

Django1.1.1 Python 2.5

Answer 1

我也遇到过同样的问题。在我的情况下，代码被执行了两次。我当时的情况是：

在一个应用里：

from apps.accounts.models import User

在另一个应用里：

from accounts.models import User

因为自定义的代码放在了accounts/models.py这个模块里，所以它被执行了两次。