Django Page not found error event if path is correct

Question

I'm new to Django framework using 2.1 version, I have trouble using optional parameters in urls.py

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

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

Appname : myblog

urls.py

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

from . import views
app_name = 'myblog' #FOR NAMESPACE ISSUE THIS IS REQUIRED
urlpatterns = [
    re_path(r'^test_view/<mode>/(?:blog-(?P<blog_id>\d+)/)?$', views.test_view)
]

myblog view.py

def test_view(request, mode, blog_id):
    return HttpResponse('ss')

myblog template

<button type="button" class="btn-xs btn-primary" onclick="location.href='{% url 'myblog:test_view' 'create' 1 %}'">Create New Blog</button>

ERROR

IN TEMPLATE : 
NoReverseMatch at /myblog/
Reverse for 'test_view' not found. 'test_view' is not a valid view function or pattern name.

ADD WHILE ACCESSING URL DIRECTLY http://127.0.0.1:8000/myblog/test_view/create/1/ I GET PAGE NOT FOUND

IT IS TO BE NOTED THAT AS PER THE DOCUMENTATION GIVEN IN DJANGO DOCUMENTATION I HAD MAKE SAME CHANGES BUT STILL I GET THAT ERROR

THANKS IN ADVANCE.

Please remove the "noise": change uppercase into lowercase, etc. — Willem Van Onsem, Sep 03 '18 at 07:11

neverwalkaloner · Accepted Answer · 2018-09-03T07:06:08.850

1

You can specify url name using name argument:

re_path(r'^test_view/(?P<mode>\w+)/(?:blog-(?P<blog_id>\d+)/)?$', views.test_view, name='test_view')

edited Sep 03 '18 at 07:06

answered Sep 03 '18 at 06:58

neverwalkaloner

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Unfortunately it didn't work here is the error i got `Reverse for 'test_view' with arguments '('create', 1)' not found. 1 pattern(s) tried: ['myblog\\/test_view//(?:blog-(?P\\d+)/)?$']` – Pavan Webbeez Sep 03 '18 at 07:00
@PavanWebbeez check update. Fix regexp here ``. – neverwalkaloner Sep 03 '18 at 07:06
1

Amazing thank you so much. It works !. IS `?P` a optional parameter. – Pavan Webbeez Sep 03 '18 at 07:12
@PavanWebbeez no it just means named group. – neverwalkaloner Sep 03 '18 at 07:21
so i django how can i specify a parameter as optional – Pavan Webbeez Sep 03 '18 at 07:28
1

@PavanWebbeez you need `?:`, check this queston https://stackoverflow.com/questions/14351048/django-optional-url-parameters – neverwalkaloner Sep 03 '18 at 07:31

Django Page not found error event if path is correct

ERROR

IT IS TO BE NOTED THAT AS PER THE DOCUMENTATION GIVEN IN DJANGO DOCUMENTATION I HAD MAKE SAME CHANGES BUT STILL I GET THAT ERROR

1 Answers1