Django AttributeError: 'Alias' 对象没有属性 'urls'

Question

我刚刚为我的 Heroes 应用编写了我的模型：

这是我的 Heroes 应用程序的 models.py 文件：

从 django.db 导入模型

# Create your models here.
class Hero(models.Model):
    codename = models.CharField(max_length = 30)
    profilePic = models.ImageField(blank=True) #blank makes this optional

    def __str__(self):
        return (self.codename)

class Stats(models.Model):
    heroID = models.ForeignKey('Hero')
    height = models.CharField(max_length = 10)
    weight = models.CharField(max_length = 10)
    STATS_CHOICES = (
    ('1', 'Extremely Low'),
    ('2', 'Very Low'),
    ('3', 'Low'),
    ('4', 'Average'),
    ('5', 'Good'),
    ('6', 'Above Average'),
    ('7', 'High'),
    ('8', 'Very High'),
    ('9', 'Super Human'),
    ('10', 'Above and Beyond'))
    powers = models.CharField(max_length = 5, choices = STATS_CHOICES)
    intelligence = models.CharField(max_length = 5, choices = STATS_CHOICES)
    durability = models.CharField(max_length = 5, choices = STATS_CHOICES)
    strength = models.CharField(max_length = 5, choices = STATS_CHOICES)
    speed = models.CharField(max_length = 5, choices = STATS_CHOICES)

    def __str__(self):
        return (self.heroID)

class Team(models.Model):
    name = models.CharField(max_length = 25)
    leader = models.IntegerField
    address = models.TextField
    description = models.TextField
    members = models.TextField

class Status(models.Model):
    heroID = models.ForeignKey('Hero')
    missionID = models.IntegerField
    TeamID = models.IntegerField

    def __str__(self):
        return (self.heroID, self.missionID, self.TeamID)

class Alias(models.Model):
    heroID = models.ForeignKey('Hero')
    firstName = models.CharField(max_length = 25)
    surname = models.CharField(max_length = 25)
    formerCodeNames = models.TextField
    occupation = models.CharField(max_length = 30)
    address = models.TextField
    citizenship = models.CharField(max_length = 40)
    species = models.CharField(max_length = 40)

    def __str__(self):
        return (self.heroID, self.firstName, self.surname)

我在已安装的应用程序下调整了我的 settings.py 文件：

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',

    #custom apps
    'heroes',
]

然后我调整了我的 admin.py 文件：

from django.contrib import admin

# Register your models here.
from .models import Hero, Stats, Team, Status, Alias

admin.site.register(Hero, Stats)
admin.site.register(Team)
admin.site.register(Status, Alias)

在命令提示符中，我输入： python manage.py makemigrations 并且我收到此错误 - “AttributeError: 'Alias' object has no attribute 'urls'”：

(secondproject) C:\Python34\Scripts\secondproject\heroes4Hire>python manage.py
emigrations
aceback (most recent call last):
File "manage.py", line 22, in <module>
  execute_from_command_line(sys.argv)
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\core\managem
\__init__.py", line 367, in execute_from_command_line
  utility.execute()
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\core\managem
\__init__.py", line 359, in execute
  self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\core\managem
\base.py", line 294, in run_from_argv
  self.execute(*args, **cmd_options)
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\core\managem
\base.py", line 342, in execute
  self.check()
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\core\managem
\base.py", line 374, in check
  include_deployment_checks=include_deployment_checks,
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\core\managem
\base.py", line 361, in _run_checks
  return checks.run_checks(**kwargs)
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\core\checks\
istry.py", line 81, in run_checks
  new_errors = check(app_configs=app_configs)
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\core\checks\
s.py", line 14, in check_url_config
  return check_resolver(resolver)
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\core\checks\
s.py", line 24, in check_resolver
  for pattern in resolver.url_patterns:
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\utils\functi
l.py", line 35, in __get__
  res = instance.__dict__[self.name] = self.func(instance)
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\urls\resolve
py", line 313, in url_patterns
  patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\utils\functi
l.py", line 35, in __get__
  res = instance.__dict__[self.name] = self.func(instance)
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\urls\resolve
py", line 306, in urlconf_module
  return import_module(self.urlconf_name)
File "C:\Python34\Scripts\secondproject\lib\importlib\__init__.py", line 109,
 import_module
  return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
File "<frozen importlib._bootstrap>", line 2226, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
File "<frozen importlib._bootstrap>", line 1129, in _exec
File "<frozen importlib._bootstrap>", line 1471, in exec_module
File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
File "C:\Python34\Scripts\secondproject\heroes4Hire\heroes4Hire\urls.py", lin
0, in <module>
  url(r'^admin/', admin.site.urls),
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\contrib\admi
ites.py", line 267, in urls
  return self.get_urls(), 'admin', self.name
File "C:\Python34\Scripts\secondproject\lib\site-packages\django\contrib\admi
ites.py", line 251, in get_urls
  url(r'^%s/%s/' % (model._meta.app_label, model._meta.model_name), include(m
l_admin.urls)),
tributeError: 'Alias' object has no attribute 'urls'

这是什么意思，我该如何解决？ 我在 StackOverFlow 上看过其他类似的问题，但我不明白如何解决它。

Answer 1

我终于在 codebar 的聚会上得到了答案！

model.p 中的每个类都需要位于 admin.py 上的单独一行中。

所以答案是：

from django.contrib import admin

# Register your models here.
from .models import Hero, Stats, Team, Status, Alias

admin.site.register(Hero)
admin.site.register(Stats)
admin.site.register(Team)
admin.site.register(Status)
admin.site.register(Alias)

Answer 2

你应该改变

admin.site.register(Status, Alias)

到

admin.site.register(Status)
admin.site.register(Alias)

此模型应通过单独的行添加到 admin 中。

Answer 3

register 函数将一个类列表作为它的第一个参数

from django.contrib import admin

# Register your models here.
from .models import Hero, Stats, Team, Status, Alias

admin.site.register( [Hero, Stats, Team, Status, Alias] )

Answer 4

（tl;dr：将模型放在列表中）

有同样的问题，在这里找到解决方案然后自己阅读代码并认为我会添加一些细节。

这是注册函数的定义（来自 django/contrib/admin/sites.py）。

def register(self, model_or_iterable, admin_class=None, **options):
   ...

它需要一个模型或一个可迭代对象，它做的第一件事是检查它是否有一个模型，如果有，把它放在一个列表中，然后在它上面运行主循环（第一行与那个无关)：

admin_class = admin_class or ModelAdmin
if isinstance(model_or_iterable, ModelBase):
   model_or_iterable = [model_or_iterable]
for model in model_or_iterable:
   ...

当您将第二个模型放在不在列表中时，它会被传递给 admin_class 参数并被视为这样，直到最终在某处给出错误为止。

因此，您可以将所有模型放在一个列表中，而不是多次调用此函数。 我什至会用一个来做 - 无论如何，该函数都会这样做，所以你只是为了避免自己和其他人在以后遇到这个问题而编辑代码。