Question

我在项目级别urls.py文件中收到以下循环导入错误：

ImproperlyConfigured: The included URLconf 'pres_value.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.

请注意，pres_value是项目级别，present是应用程序级别。因此，显然错误发生在项目级别urls文件中。该应用程序已在settings.py文件中注册。

感谢您对这里出了什么问题的帮助。

项目级别pres_value/urls.py：

from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('present/', include('present.urls')),
]

应用程序级别present/urls.py：

from django.urls import path

from .views import HomePageView, PresentValueView, AboutPageView, ResultView

urlpatterns = [
    path('', HomePageView.as_view(), name='home'),
    path('about/', AboutPageView.as_view(), name='about'),
    path('pv/', PresentValueView.as_view(), name='present_value'),
    path('result/', ResultView.as_view(), name='result'),
]

settings.py：

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'present',
]

目录结构：

├── Pipfile
├── Pipfile.lock
├── db.sqlite3
├── manage.py
├── pres_value
│   ├── __init__.py
│   ├── __pycache__
│   ├── settings.py
│   ├── urls.py
│   └── wsgi.py
├── present
│   ├── __init__.py
│   ├── __pycache__
│   ├── admin.py
│   ├── apps.py
│   ├── forms.py
│   ├── migrations
│   │   ├── 0001_initial.py
│   │   ├── __init__.py
│   │   └── __pycache__
│   ├── models.py
│   ├── templates
│   │   └── present
│   │       ├── about.html
│   │       ├── home.html
│   │       ├── pv.html
│   │       └── result.html
│   ├── tests.py
│   ├── urls.py
│   └── views.py
└── templates
    ├── base.html
    ├── footer.html
    ├── header.html
    └── nav.html

views.py

from django.shortcuts import reverse
from django.views.generic import TemplateView
from django.views.generic.edit import CreateView
from .forms import PresentForm
from .models import PresentValue

# Create your views here.
class HomePageView(TemplateView):
    template_name = 'present/home.html'

class PresentValueView(CreateView):
    model = PresentValue
    template_name = 'present/pv.html'
    # fields = ['first', 'second']
    success_url = reverse('result')

class AboutPageView(TemplateView):
    template_name = 'present/about.html'  ## this is where I show an error

class ResultView(TemplateView):
    template_name = 'present/result.html'

Answer 1

循环导入是由reverse()引起的。

解决方案：使用reverse_lazy。

from django.core.urlresolvers import reverse_lazy

class PresentValueView(CreateView):
    model = PresentValue
    template_name = 'present/pv.html'
    # fields = ['first', 'second']
    success_url = reverse_lazy('result')

在Django URL中获取循环导入错误

1 个答案: