Develop Reference

Using the URLconf defined in learning_log.urls, Django tried these URL patterns, in this order:

Below are my url patterns from learning logs
from django.contrib import admin
from django.urls import include, path
urlpatterns = [
path('admin/', admin.site.urls),
path('learning_logs/', include('learning_logs.urls')),
]
And below is the url I'm adding
"""Defines URL patterns for learning_logs"""
from django.urls import path
from . import views
app_name = 'learning_logs'
urlpatterns = {
# Home page
path('', views.index, name='index'),
# Show all topics
path('topics', views.topics, name='topics'),
# Detail page for a single topic
path(r'^topics/(?P<topic_id>\d+)/$', views.topic, name='topic', ),
# Page for adding a new topic
path('new_topic', views.new_topic, name='new_topic'),
}
Below is the error I'm getting from my browser
Using the URLconf defined in learning_log.urls, Django tried these URL patterns, in this
order:
admin/
learning_logs/ new_topic [name='new_topic']
learning_logs/ ^topics/(?P<topic_id>\d+)/$ [name='topic']
learning_logs/ topics [name='topics']
learning_logs/ [name='index']
The current path, learning_logs/topics/(?P1\d+)/, didn’t match any of these.
You’re seeing this error because you have DEBUG = True in your Django settings file. Change
that to False, and Django will display a standard 404 page.
My Python version environments are
Python 3.10
Django 4.1.1
IDE-PyCharm

Remove the ^ in your url pattern.
This char means: beginning of the full url path. but in your case, it is not the beginning of the full path because, your url start by learning_logs/.

This is what I'm getting from terminal after removing ^ ...
?: (2_0.W001) Your URL pattern 'topics/$' [name='topics'] has a route that
contains '(?P<', begins with a '^', or ends with a '$'. This was likely an
oversight when migrating
to django.urls.path().
?: (2_0.W001) Your URL pattern 'topics/(?P<topic_id>\d+)/$' [name='topic'] has a
route that contains '(?P<', begins with a '^', or ends with a '$'. This was
likely an oversig
ht when migrating to django.urls.path().
And the browser still have a same output

django can't find url even though it is there

I have an issue where I try to go to my redirect page and get a NoReverseMatch when though the URL is there? Any idea how to fix this?
I have checked that the "schema" url works and it correctly supplies the openapi schema, but the other page simply can't understand the url.
URLS:
urlpatterns = [
path("schema/", SpectacularAPIView.as_view(), name="schema"),
# Optional UI:
path("docs/", SpectacularSwaggerView.as_view(url_name="schema"), name="swagger-ui"),
]
Errors:

For reverse url pathing, you have to use {% url api:schema %}. It's specified as namespace next to include('api.urls') or inside app urls, just above urlpatterns - like app_name = "api".

Django backend not returning JSON on production server, getting 404

I have a Django backend that returns json data. I'm able to get data back on my localhost but got a 404 on production server. I'm running nginx in front of gunicorn server. Any ideas why I'm getting a 404? Shouldn't this be able to work to retrieve json data, or do I need to use django rest framework and implement viewsets to make this work?
Not Found
The requested URL /about was not found on this server.
urls.py
urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'^about', about.get_info),
]
about.py
from django.http import JsonResponse
def get_info(req):
return JsonResponse({"test": "hello"})

The problem is inside url.py. The way the rules are defined currently, it would only allow you to open about/ and admin/, i.e. with the / at the end. To fix this, you can define the URLs as following:
urlpatterns = [
url(r'^admin/$', admin.site.urls),
url(r'^about/$', about.get_info),
]
Now you should be able to use both admin/ and admin to access the page.

URL Regular Expression mismatch

I am trying to learn Django and I am currently stuck in an issue.
I created an app Contact and run the server, I get the error.
The error page displayed by server:
The urls.py file in the app Contact
urls.py in conatct
When the pattern in urls.py is
urlpatterns =[url(r'^$', views.form, name ='form')]
it works properly, but not with other pattern shown in the picture
Your help would be greatly appreciated.

The Page not found error message tells you what went wrong: For the URL (/contact) you requested, Django was unable to find a suitable view. Because you have debugging enabled, you get some information, including a list of registered views.
First things first: You probably have url(r'^contact/', include('contact.urls')) somewhere in your top level urls.py. This makes the URLs defined in the contact/urls.py available under the prefix /contact.
With
urlpatterns = [
url(r'^form/', views.form, name='form'),
]
in contact/urls.py you are telling Django that you want urls starting with contact/form/ to be handled by views.form.
Consequently, when you access http://localhost:8000/contact/ in your browser, there is no view associated with that URL, hence the 404. Your view is reacting to to http://localhost:8000/contact/form, not http://localhost:8000/contact.
When you change the URL pattern to
urlpatterns = [
url(r'^$', views.form, name='form'),
]
you modify the URL views.form reacts to.

Django how to define default app for home URL?

I'm learning Django, and so far I always had to use URL's like
projectname/appname/viewname
but what if I don't want appname to appear in the URLs for the "default" app, how can I configure my urls so that
projectname/viewname
will load the view viewname from my default app?
P.S. : Of course my primary goal is to be able to use the URL projectname/ to load the default view for the default app.
Details
Currently my ProjectName/urls.py has this:
urlpatterns = patterns('',
url(r'^static/(?P<path>.*)$', 'django.views.static.serve',
{'document_root', settings.STATIC_ROOT}
),
url(r'^admin/', include(admin.site.urls)),
url(r'^myapp1/', include('myapp1.urls', namespace='myapp1', app_name='myapp1')),
url(r'^myapp2/', include('myapp2.urls', namespace='myapp2', app_name='myapp2')),
)
so when I deploy my project to Heroku, and visit myproject.heroku.com, I get the error :
Page not found (404)
Request Method: GET
Request URL: https://myproject.herokuapp.com/
Using the URLconf defined in MyProject.urls, Django tried these URL patterns, in this order:
^static/(?P<path>.*)$
^admin/
^myapp1/
^myapp2/
I know this is supposed to be, but how do I fix (or hack) this to get myproject.heroku.com to work?
If not possible, how can I redirect the homepage to myproject/myapp1/defaultview ?
Thanks in advance !
my app's urls.py looks like this :
urlpatterns = patterns('myapp1.views',
url(r'^view1/$', 'view1', name='view1'), # the default view
url(r'^view2/(?P<oid>\d+)/(?P<pid>\d+)/$', 'view2', name='view2'),
)
Edit
After trying #Wallace 's suggestion url(r'^$', include('myapp1.urls', namespace='myapp1', app_name='myapp1')), and hitting the homepage, I now get the error:
Using the URLconf defined in myproject.urls, Django tried these URL patterns, in this order:
^static/(?P<path>.*)$
^admin/
^$ ^view1/$ [name='view1']
^$ ^view2/(?P<oid>\d+)/(?P<pid>\d+)/$ [name='view2']
^myapp2/

Tried changing your project urls.py with:
url(r'', include('myapp1.urls', ...)
This will include all urls from myapp1.urls where they all append to /.
The reason why r'^$' won't work is because the regex ends with $ which means there can only be 1 x url /, and because your app1.urls only has 2 urls defined and without a / or ^$ equivalent, the url resolver will then fail.
But be aware of url clashes, if your project has a ^view1/$ url it will clash to your app1's view1 for example.

Try not including your appname in the regular expression.
url(r'', include('myapp1.urls', namespace='myapp1', app_name='myapp1')),