为什么基于类的视图返回的类型对象“Profile”没有属性“model”?

这是项目URL。py:

urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'^', include('accounts.urls')),
url(r'^login/$', LoginView.as_view(), name='login'),
url(r'^register/$', RegisterView.as_view(), name='register'),
url(r'^logout/$', logout_view, name="logout")
]

from . import views
urlpatterns = [
url(r'(?P<username>[\w]+)/$', views.Profile.as_view(), name='profile_cbv'),
]

这是剖面模型:

class Profile(models.Model):
    user = models.OneToOneField(settings.AUTH_USER_MODEL, related_name='profile', verbose_name='user', on_delete=models.CASCADE)
    name = models.CharField(max_length=30, verbose_name='name')
    family = models.CharField(max_length=50, verbose_name='family')

最后,这是基于Profile类的视图:

class Profile(View):
def get(self, request, username=None):
    profile = get_object_or_404(Profile, user__username=username)

    print(profile)
    pass

例如,我转到以下url:

localhost:8000/ivan/

AttributeError at /ivan/
type object 'Profile' has no attribute 'model'

如果我传递了一个正确或不正确的用户名和url来查看,那么每次都会出现这个错误。