Django 反向导致 url 循环导入，为什么？

Question

我收到这个错误：

The included urlconf 'fouraxis.urls' does not appear to have any patterns in it. If you see valid patterns in the file then the issue is probably caused by a circular import.

我知道 url 模式里面有东西，它看起来像这样：

from django.conf.urls import include, url
from django.contrib import admin

    urlpatterns = [
        url(r'^perfil/', include('clientes.urls'), namespace="cliente"),
        url(r'^admin/', include(admin.site.urls))
    ]

clientes.urls:

from django.conf.urls import url
from django.contrib.auth import views as auth_views

from clientes import views

urlpatterns = [
        # login
        url(r'^login/$', auth_views.login, {'template_name': 'perfiles/login.html'}, name="login"),
        url(r'^logout/$', auth_views.logout, {'template_name': 'perfiles/logged_out.html'}, name="login"),

        url(r'^mi_perfil/$', views.mi_perfil, name="mi_perfil"),
        url(r'^registro_usuario/$', views.RegistroUsuario.as_view(), name="registro_usuario")
    ]

RegistroUsuario 视图如下所示：

class RegistroUsuario(FormView):
    template_name = "perfiles/registro_usuario.html"
    form_class = UserCreationForm
    success_url = reverse("cliente:mi_perfil")  # THIS REVERSE

    def form_valid(self, form):
        return redirect("cliente:mi_perfil")

    context = {'form': UserCreationForm}

我知道我可以用这样的纯文本 url 替换 reverse perfil/mi_perfil。但是，我想知道为什么会发生这种情况，我在 de docs 上找不到解释。此外，使用 reverse 更好，因为它是动态的（如果我随时更改 url，只要保留其名称，它仍然有效）。

Answer 1

reverse() 调用是在导入视图时进行的，这可能是在首次加载 urlconf 时。您需要使用 reverse_lazy() 代替：

from django.core.urlresolvers import reverse_lazy

class RegistroUsuario(FormView):
    template_name = "perfiles/registro_usuario.html"
    form_class = UserCreationForm
    success_url = reverse_lazy("cliente:mi_perfil")  # THIS REVERSE

    def form_valid(self, form):
        return redirect("cliente:mi_perfil")

    context = {'form': UserCreationForm}

Django 反向导致 url 循环导入，为什么？

Django reverse causing url circular import, why?

django

django-urls