我已经意识到一些应用程序模型：
from django.db import models
class Commentary(models.Model):
user_id = models.ForeignKey(User)
created_date = models.DateField()
comment = models.TextField()
class Role(models.Model):
role_name = models.CharField(max_length=25)
class User(models.Model):
login = models.CharField(max_length=50)
password = models.CharField(max_length=50)
address = models.CharField(max_length=255)
phone = models.CharField(max_length=25)
postcode = models.CharField(max_length=25)
email = models.EmailField()
role_id = models.OneToOneField(Role)
之后，在控制台中输入“ python manage.py makemigration mainws”以在我的数据库中进行迁移，但是，在堆栈跟踪中出现了错误。如果在django文档中查找一对一的示例，我们可以看到与他的相似之处，但没有选择primary_key=True。我怎样才能解决这个问题或者也许更好的使用ForeignKey与unique=True此问题，或者其他什么东西？
堆栈跟踪：
=> python manage.py makemigration mainws
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/Users/savicvalera/code/lab8/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
utility.execute()
File "/Users/savicvalera/code/lab8/lib/python2.7/site-packages/django/core/management/__init__.py", line 354, in execute
django.setup()
File "/Users/savicvalera/code/lab8/lib/python2.7/site-packages/django/__init__.py", line 21, in setup
apps.populate(settings.INSTALLED_APPS)
File "/Users/savicvalera/code/lab8/lib/python2.7/site-packages/django/apps/registry.py", line 108, in populate
app_config.import_models(all_models)
File "/Users/savicvalera/code/lab8/lib/python2.7/site-packages/django/apps/config.py", line 202, in import_models
self.models_module = import_module(models_module_name)
File "/usr/local/Cellar/python/2.7.8_2/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/Users/savicvalera/code/lab8/website/mainws/models/__init__.py", line 1, in <module>
from . import Commentary, MailList, Product, Provider, Rate, Review, Role, Sale, ShoppingCart, Status, Supplies, User
File "/Users/savicvalera/code/lab8/website/mainws/models/Commentary.py", line 11, in <module>
from . import Product, User
File "/Users/savicvalera/code/lab8/website/mainws/models/User.py", line 14, in <module>
class User(models.Model):
File "/Users/savicvalera/code/lab8/website/mainws/models/User.py", line 21, in User
role_id = models.OneToOneField(Role,to_field='id')
File "/Users/savicvalera/code/lab8/lib/python2.7/site-packages/django/db/models/fields/related.py", line 1799, in __init__
super(OneToOneField, self).__init__(to, to_field, OneToOneRel, **kwargs)
File "/Users/savicvalera/code/lab8/lib/python2.7/site-packages/django/db/models/fields/related.py", line 1612, in __init__
assert isinstance(to, six.string_types), "%s(%r) is invalid. First parameter to ForeignKey must be either a model, a model name, or the string %r" % (self.__class__.__name__, to, RECURSIVE_RELATIONSHIP_CONSTANT)
AssertionError: OneToOneField(<module 'mainws.models.Role' from '/Users/savicvalera/code/lab8/website/mainws/models/Role.pyc'>) is invalid. First parameter to ForeignKey must be either a model, a model name, or the string u'self'
如果我正确理解您的代码组织，则问题出在您的导入中。当你说
from . import Role
您正在导入Role.py名为的模块对象Role。在该模块内（我假设）是您的Role模型类。因此，您真正想要的是：
from .Role import Role
或者：
from . import Role
...
role_id = models.OneToOneField(Role.Role)
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我来说两句