Question

我正在尝试将基于角色的权限实现到我的应用程序中。我有一个decorator role_required，我可以传递一组用户角色，只有具有该角色的用户才能访问该视图。我已经为用户正确分配了角色，但现在我收到了AttributeError，声明'Role' object has no attribute '__name__'

views.py档案：

m_role_required = method_decorator(role_required)
class AddProposal(FormView):

    @m_role_required(roles.space_admin)
    def dispatch(self, *args, **kwargs):
        return super(AddProposal, self).dispatch(*args, **kwargs)

装饰者role_required：

from django.contrib.auth.decorators import user_passes_test
def role_required(*roles):

    def check_role(user):
        return getattr(user, 'role', None) in roles
    return user_passes_test(check_role)

Role类：

class Roles(object):
    _roles_dict = None

    @property
    def roles_dict(self):

        if self._roles_dict is None:
            self._roles_dict = {}
            for item in self._config:
                if isinstance(item, basestring):
                    # An item like 'manager'
                    self._roles_dict[item] = None
                else:
                    # Anything else
                    raise ImproperlyConfigured(_INCORRECT_ARGS)
        return self._roles_dict

    @property
    def choices(self):

        return [(role, role) for role in self.roles_dict.keys()]

    def __init__(self, config=None):

        self._config = config or getattr(settings, 'USER_ROLES', ())

    def __getattr__(self, name):

        if name in self.roles_dict.keys():
            return Role(name=name)
        else:
            raise AttributeError("No such role exists '%s'" % name)

roles = Roles()

我无法找出导致此错误的原因。谁能帮忙。让我用这个添加回溯，

环境：

Request Method: GET
Request URL: http://127.0.0.1:8000/en-gb/spaces/bithin/proposal/add/


Traceback:

  48. class AddProposal(FormView):
File "/home/bithin/gsoc/week3/e-cidadania/src/apps/ecidadania/proposals/views.py" in AddProposal
  78.     @m_role_required(roles.space_admin)
File "/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py" in _dec
  34.         update_wrapper(_wrapper, func)
File "/usr/lib/python2.7/functools.py" in update_wrapper
  33.         setattr(wrapper, attr, getattr(wrapped, attr))

Exception Type: AttributeError at /en-gb/spaces/bithin/proposal/add/
Exception Value: 'Role' object has no attribute '__name__'

Answer 1

查看django.utils.decorators.method_decorator的代码。它返回的方法装饰器不能接受进一步的参数保存为实际的装饰功能。此函数的属性（包括其__name__）通过functools.update_wrapper以通常的Python方式复制。您收到此错误是因为您传递了Role对象而不是函数。

换句话说，你需要像这样重写你的观点：

space_admin_required = method_decorator(role_required(roles.space_admin))
class AddProposal(FormView):

    @space_admin_required
    def dispatch(self, *args, **kwargs):
        return super(AddProposal, self).dispatch(*args, **kwargs)

Answer 2

这是Why do python instances have no __name__ attribute?

的潜在副本

简答：类的名称存储在类中，并且不能直接用于实例。您可以通过myinstance.__class__.__name__访问实例的类名。

'Role'对象没有属性'name'

2 个答案:

'Role'对象没有属性'__name__'

2 个答案:

'Role'对象没有属性'name'