I am trying to implement role based permission into my application. I have a decorator role_required into which I can pass a set of user roles and only those user with that role can access that view. I have properly assigned roles to the user but, now I am getting AttributeError stating that 'Role' object has no attribute '__name__'
views.py
file:
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)
The decorator 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)
The Role
class:
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()
I am not able to find out why this error is being raised. Can anyone help. Let me add the traceback with this,
Environment:
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__'
Have a look at the code for django.utils.decorators.method_decorator
. The method decorator it returns cannot accept further parameters save for the actual function to decorate. Properties of this function, including its __name__
, are copied over via functools.update_wrapper
, in the usual Python fashion. You get this error because you pass a Role
object instead of a function.
In other words, you need to rewrite your view like this:
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)