Python FieldError位于/admin/-为UserProfile指定的未知字段（已添加）

我在Django中使用自定义用户模型。该模型运行良好，能够创建用户。但是当我尝试访问管理页面时，它会抛出错误

FieldError at /admin/
Unknown field(s) (added_on) specified for UserProfile

UserProfile

添加了一个

属性。我想不出有什么理由可以证明这一点。如果我从admin.py文件中删除
added_on
属性，管理面板将工作

这是我的模特

from django.db import models
from django.contrib.auth.models import User, BaseUserManager, AbstractBaseUser
from django.conf import settings

class UserProfileManager(BaseUserManager):
    def create_user(self, email, username, name, password=None):
        if not email:
            raise ValueError('Users must have an email address')

        user = self.model(
            username=username,
            name=name,
            email=self.normalize_email(email),
        )

        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_superuser(self, email, username, name, password):
        user = self.create_user(email=email,
                password=password,
                username=username,
                name=name
            )
        user.is_admin = True
        user.save(using=self._db)
        return user


class UserProfile(AbstractBaseUser):
    SHOPPER = 1
    TECH_ENTHU = 2
    TECH_JUNKIE = 3
    TECH_NINJA = 4
    TECH_GURU = 5
    LEVELS = (
        (SHOPPER, 'Shopper'),
        (TECH_ENTHU, 'Tech Enthusiast'),
        (TECH_JUNKIE, 'Tech Junkie'),
        (TECH_NINJA, 'Tech Ninja'),
        (TECH_GURU, 'Tech Guru')
    )

    email = models.EmailField(max_length=255, unique=True)
    username = models.CharField(max_length=100, unique=True)
    name = models.CharField(max_length=255)
    location = models.CharField(max_length=255, blank=True, null=True)
    website = models.CharField(max_length=255, blank=True, null=True)
    image_1 = models.CharField(max_length=255, blank=True, null=True)
    image_2 = models.CharField(max_length=255, blank=True, null=True)
    image_3 = models.CharField(max_length=255, blank=True, null=True)
    points = models.PositiveIntegerField(default=0)
    level = models.PositiveSmallIntegerField(choices=LEVELS, default=SHOPPER)
    added_on = models.DateTimeField(auto_now_add=True)

    is_active = models.BooleanField(default=True)
    is_admin = models.BooleanField(default=False)

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = ['username', 'name']

    objects = UserProfileManager()

    def get_full_name(self):
        return self.name

    def get_short_name(self):
        return self.name

    def __unicode__(self):
        return self.email

    def has_perm(self, perm, obj=None):
        return True

    def has_module_perms(self, app_label):
        return True

    @property
    def is_staff(self):
        return self.is_admin


class OldUser(models.Model):
    old_user_id = models.BigIntegerField()
    user = models.ForeignKey(settings.AUTH_USER_MODEL)
    converted = models.BooleanField(default=False)

这是我的管理员

from django import forms
from django.contrib import admin
from django.contrib.auth.models import Group
from django.contrib.auth.admin import UserAdmin
from django.contrib.auth.forms import ReadOnlyPasswordHashField

from users.models import UserProfile

class UserCreationForm(forms.ModelForm):
    """A form for creating new users. Includes all the required
    fields, plus a repeated password."""
    password1 = forms.CharField(label='Password', widget=forms.PasswordInput)
    password2 = forms.CharField(label='Password confirmation', widget=forms.PasswordInput)

    class Meta:
        model = UserProfile
        fields = ('username', 'name')

    def clean_password2(self):
        # Check that the two password entries match
        password1 = self.cleaned_data.get("password1")
        password2 = self.cleaned_data.get("password2")
        if password1 and password2 and password1 != password2:
            raise forms.ValidationError("Passwords don't match")
        return password2

    def save(self, commit=True):
        # Save the provided password in hashed format
        user = super(UserCreationForm, self).save(commit=False)
        user.set_password(self.cleaned_data["password1"])
        if commit:
            user.save()
        return user


class UserChangeForm(forms.ModelForm):
    """A form for updating users. Includes all the fields on
    the user, but replaces the password field with admin's
    password hash display field.
    """
    password = ReadOnlyPasswordHashField()

    class Meta:
        model = UserProfile
        fields = ('email', 'password', 'username', 'name', 'location', 'website', 'image_1', 'image_2', 'image_3',
                  'points', 'level', 'added_on', 'is_active', 'is_admin')

    def clean_password(self):
        # Regardless of what the user provides, return the initial value.
        # This is done here, rather than on the field, because the
        # field does not have access to the initial value
        return self.initial["password"]


class UserProfileAdmin(UserAdmin):
    # The forms to add and change user instances
    form = UserChangeForm
    add_form = UserCreationForm

    # The fields to be used in displaying the User model.
    # These override the definitions on the base UserAdmin
    # that reference specific fields on auth.User.
    list_display = ('email', 'username', 'name', 'points', 'level', 'is_admin')
    list_filter = ('is_admin',)
    fieldsets = (
        (None, {'fields': ('email', 'password')}),
        ('Personal info', {'fields': ('username', 'name', 'location', 'website', 'image_1', 'image_2', 'image_3',
                           'points', 'level', 'added_on')}),
        ('Permissions', {'fields': ('is_admin',)}),
    )
    # add_fieldsets is not a standard ModelAdmin attribute. UserAdmin
    # overrides get_fieldsets to use this attribute when creating a user.
    add_fieldsets = (
        (None, {
            'classes': ('wide',),
            'fields': ('email', 'username', 'name', 'password1', 'password2')}
        ),
    )
    search_fields = ('email',)
    ordering = ('email',)
    filter_horizontal = ()

admin.site.register(UserProfile, UserProfileAdmin)
# Since we're not using Django's built-in permissions,
# unregister the Group model from admin.
admin.site.unregister(Group)

这是回溯

Environment:


Request Method: GET
Request URL: http://127.0.0.1:8000/admin/

Django Version: 1.6.2
Python Version: 2.7.3
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'users')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware')


Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  101.                 resolver_match = resolver.resolve(request.path_info)
File "/usr/local/lib/python2.7/dist-packages/django/core/urlresolvers.py" in resolve
  318.             for pattern in self.url_patterns:
File "/usr/local/lib/python2.7/dist-packages/django/core/urlresolvers.py" in url_patterns
  346.         patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/usr/local/lib/python2.7/dist-packages/django/core/urlresolvers.py" in urlconf_module
  341.             self._urlconf_module = import_module(self.urlconf_name)
File "/usr/local/lib/python2.7/dist-packages/django/utils/importlib.py" in import_module
  40.         __import__(name)
File "/home/jaskaran/coding/buyingiq/authentication/authentication/urls.py" in <module>
  4. admin.autodiscover()
File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/__init__.py" in autodiscover
  29.             import_module('%s.admin' % app)
File "/usr/local/lib/python2.7/dist-packages/django/utils/importlib.py" in import_module
  40.         __import__(name)
File "/home/jaskaran/coding/buyingiq/authentication/users/admin.py" in <module>
  36. class UserChangeForm(forms.ModelForm):
File "/usr/local/lib/python2.7/dist-packages/django/forms/models.py" in __new__
  292.                 raise FieldError(message)

Exception Type: FieldError at /admin/
Exception Value: Unknown field(s) (added_on) specified for UserProfile

环境：
请求方法：获取
请求URL:http://127.0.0.1:8000/admin/
Django版本：1.6.2
Python版本：2.7.3
已安装的应用程序：
（“django.contrib.admin”，
“django.contrib.auth”，
“django.contrib.contenttypes”，
“django.contrib.sessions”，
“django.contrib.messages”，
“django.contrib.staticfiles”，
"用户")
已安装的中间件：
（'django.contrib.sessions.middleware.SessionMiddleware'，
'django.middleware.common.CommonMiddleware'，
“django.middleware.csrf.CsrfViewMiddleware”，
'django.contrib.auth.middleware.AuthenticationMiddleware'，
'django.contrib.messages.middleware.MessageMiddleware'，
'django.middleware.clickjacking.xframeoptions中间件'）
回溯：
get_响应中的文件“/usr/local/lib/python2.7/dist packages/django/core/handlers/base.py”
101解析程序匹配=解析程序.resolve（请求.path\u信息）
解析中的文件“/usr/local/lib/python2.7/dist packages/django/core/urlresolvers.py”
318对于self.url_模式中的模式：
url_模式中的文件“/usr/local/lib/python2.7/dist packages/django/core/urlresolvers.py”
346patterns=getattr（self.urlconf_模块，“urlpatterns”，self.urlconf_模块）
urlconf_模块中的文件“/usr/local/lib/python2.7/dist packages/django/core/urlresolvers.py”
341self.\u urlconf\u module=import\u模块（self.urlconf\u名称）
导入模块中的文件“/usr/local/lib/python2.7/dist packages/django/utils/importlib.py”
40.         __导入（名称）
文件“/home/jaskaran/coding/buyingiq/authentication/authentication/url.py”
4.admin.autodiscover（）
自动发现中的文件“/usr/local/lib/python2.7/dist-packages/django/contrib/admin/_-init__.py”
29导入模块（“%s.admin”%app）
导入模块中的文件“/usr/local/lib/python2.7/dist packages/django/utils/importlib.py”
40.         __导入（名称）
文件“/home/jaskaran/coding/buyingiq/authentication/users/admin.py”
36类UserChangeForm（forms.ModelForm）：
新文件中的“/usr/local/lib/python2.7/dist packages/django/forms/models.py”__
292raise FIELD错误（消息）
异常类型：字段错误位于/admin/
异常值：为UserProfile指定的未知字段（已添加）
您的问题是该字段上的
自动\u now\u add=True
。请参见以下页面上的注释：

请注意，始终使用当前日期；它不仅仅是一个可以覆盖的默认值

及

按照当前的实施方式，设置
auto\u now
或
auto\u now\u add
至
True
将导致字段设置
editable=False
和
blank=True

由于editable=False，因此不能将其包含在该表单的字段列表中（当然可以将其放入
只读字段中）

如果希望该值将创建日期作为默认值，但仍允许对其进行编辑和覆盖，则应改用
default
：

added_on = models.DateTimeField(default=datetime.datetime.now)

（旁注，您应该始终使用callable作为默认值，而不使用调用括号）。
要使auto\u now\u add字段在管理中可见（只读），您必须将其添加到只读字段和字段中。