One 、 Problems arise

         Reference resources Django The teaching video shall be analyzed in reverse, and errors shall be reported in the steps . The code is as follows ：

        1.  Total project route MyBlog/urls.py

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

        2. Application sub route blog/urls.py

urlpatterns = [
path('', views.index, name='index'),
path('test/', views.test, name='test'),
]

        3. Apply view file blog/views.py

def index(request):
return redirect(reverse('test')) # Home page redirection
def test(request):
return HttpResponse('test')

        Error message ：

NoReverseMatch at /

Reverse for 'test' not found. 'test' is not a valid view function or pattern name.

  Two 、 Solution

        Assign an... To the application app_name, And in the general route of the project include Function configuration namespace For the application name app_name, Finally, use... In the application view file “ Applied namespace： Redirect url Of name” Format to achieve reverse parsing . The modified code is as follows ：

        1.  Total project route MyBlog/urls.py

urlpatterns = [
path('admin/', admin.site.urls),
path('users/', include('users.urls')),
path('', include('blog.urls', namespace='blog'))
]

        2.  Application sub route blog/urls.py

app_name = 'blog' # Define a namespace , Used to distinguish link addresses between different applications
urlpatterns = [
path('', views.index, name='index'),
path('test/', views.test, name='test'),
]

        3.  Apply view file blog/views.py

def index(request):
return redirect(reverse('blog:test'))
def test(request):
return HttpResponse('test')

        The modified running results ：

Reference link ：

django3.0.4 Reverse DNS _sugar-CSDN Blog One 、 The purpose of reverse parsing is when a url When the configured address changes , The address generated by reverse parsing on the page does not need to change , according to url Configuration generation of regular expressions url Two 、 Configuration steps 1. In the project urls The file contains the urls His documents were formulated namespace, It should be noted that ：include() There are two parameters in this function , One arg, One namespace, Parameters arg It's a tuple , One of the tuples is the address , One is app Name , the second name...https://blog.csdn.net/weixin_43844838/article/details/105714071