How does Django know to call the index? - python

I just started learning Django and I am a bit confused. I'm following the official documentation and this is the code:
mysite/urls.py
from django.contrib import admin
from django.urls import include, path
urlpatterns = [
path('polls/', include('polls.urls')),
path('admin/', admin.site.urls),
]
polls/views.py
from django.http import HttpResponse
from django.conf import settings
from django.shortcuts import render
from django.views import View
def index(request):
return HttpResponse("Hello, world. You're at the polls index.")
polls/urls.py
from django.urls import path
from . import views
urlpatterns = [
path('', views.index, name='index'),
]
I am mainly confused that if I add more functions in polls/views.py, how will using inclde('polls.urls') know that I wish to call the index function or some other function?
Link for the documentation page that I am following: https://docs.djangoproject.com/en/3.2/intro/tutorial01/

Essentially it constructs a list of paths (strings) that it tries to build up and then find which you wanted
so paths in polls for "" and foobar would lead django to try to match up to the following urls
polls/
polls/foobar

The full path for the views.index is 'polls/' + '' and thus 'polls/', so it appends the two.
If you make an extra path:
# polls/urls.py
urlpatterns = [
path('', views.index, name='index')
path('foo/', views.other_view, name='other-view')
]
then that path pattern will be 'polls/'+'foo/' = 'polls/foo/', so it will disambiguate between the two.
If you thus visit polls/, then the first path will match and thus "fire" index. If you visit polls/foo, then the other-view will "fire".

Related

How do I fix the circular import in django

I am trying to simply put a 'Hello World' text on the server. And it brings an error.
Project Urls.py :
from django.contrib import admin
from django.urls import path, include
urlpatterns = [
path('admin/', admin.site.urls),
path('', include('myapp.urls'))
]
App Urls.py
from django.urls import path
from . import views
urlpattern = [
path('', views.index,name = 'index')
]
Views.py
from django.shortcuts import render
from django.http import HttpResponse
def index(response):
return HttpResponse('<h1>Hello World</h1>')
The Error it tells me:
The included URLconf in myapp/urls.py 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.
You are missing an 's' in your apps urls.py.
it has to be 'urlpatterns', instead of 'urlpattern'
urlpatterns = [
path('', views.index,name = 'index')
]

Django urls.py issue, not sure what to put in 'urlpatterns'

I've been following this tutorial (Django Tutorial Part 3) and I've stumbled across what I'm assuming is a syntax issue between the time this tutorial was written and the new Django releases. My admin page loads just fine.
Code Block in Question So in the picture linked, that is the area that I am having trouble with from the tutorial. I think my "mysite/urls.py" file is fine, but the "polls/urls.py" file is where I'm not sure what to put.
Below is what mysite/urls.py looks like:
from django.contrib import admin
from django.urls import path,include
urlpatterns = [
path('admin/', admin.site.urls),
path('polls/', include('polls.urls')),
And here is what my polls/urls.py looks like:
from django.urls import path
from . import views
urlpatterns = [
path(**??? not sure what to put here**, views.index, name='index'),
]
but the polls/urls.py file is where I'm not sure what to put.
The empty string (''), so:
urlpatterns [
# &downarrow;&downarrow; empty string
path('', views.index, name='index')
]
We can inspect how the path is compiled to a regex with:
>>> from django.urls import path
>>> pt = path('', lambda x: x)
>>> pt.pattern.regex
re.compile('^$')
The pattern is thus compiled to a regex ^$, which is the same as the regex for the url pattern in the documentation.

Cannot open another HTML file from Django

I was trying to call one html file from another via Django.
I actually have no errors inside my project(It works). But when I am trying to call the second html file the page refreshes only. Here is my code, thanks:D. My projects name is information and the name of my app is basic.
basic.views.py:
from django.shortcuts import render
# Create your views here.
def index(request):
return render(request,'basic/index.html')
def customer(request):
return render(request,'basic/customer.html')
basic.urls.py:
from django.urls import path
from basic import views
app_name='basic'
urlpatterns=[
path('',views.index,name='index'),
path('',views.customer,name='customer'),
]
information.urls.py:
from django.contrib import admin
from django.urls import path,include
from basic import views
urlpatterns = [
path('',views.index,name="index"),
path('admin/', admin.site.urls),
path('',include('basic.urls'))
]
The problem is that you have two paths that match exactly the same path. So that means each time you make a request with an empty path, the first one is used.
You should make use of non-overlapping paths, for example:
# basic/urls.py
from django.urls import path
from basic import views
app_name='basic'
urlpatterns=[
path('', views.index, name='index'),
path('customer/', views.customer, name='customer'),
]
and in your information/urls.py:
# information/urls.py
from django.contrib import admin
from django.urls import path,include
from basic import views
urlpatterns = [
path('', views.index, name='index'),
path('admin/', admin.site.urls),
path('basic/', include('basic.urls'))
]

Django - Url patatterns dose not work

I started working with Django yesterday and I have a little error. I searched on the internet but I cant find the answer for my problem. I made the main app and then I make a little app and tried to link it to the main. Here is my code
urls.py
from django.contrib import admin
from django.urls import path, include
ulrpatterns = [
path('admin/', admin.site.urls),
path('^$', include('personal.urls'));
]
in my personal.urls I have
from django.urls import path, include
from . import views
ulrpatterns = [
path('^$', views.index, name="index");
]
and in views.index I have
def index(request):
return render(request, 'personal/home.html')
Any help would be awesome, thank you!!!
You are using the wrong tool here: since django-2.0, there are basically two ways to specify a URL:
with a regex through re_path [Django-doc], url [Django-doc] is an "alias" of this, but will probably eventually get deprecated; and
by using a specific "path pattern" syntax with path [Django-doc]
Here you somehow mixed the two, and use path(..) function for a "regex-specified" URL.
Using path for path pattern-based URLs
We can also fix it by using path:
# urls.py
from django.contrib import admin
from django.urls import path, include
ulrpatterns = [
path('admin/', admin.site.urls),
path('', include('personal.urls'));
]
and:
# personal/urls.py
from django.urls import path, include
from . import views
ulrpatterns = [
path('', views.index, name="index");
]
Using re_path for regular expression-based URLs
We can also fix it by using re_path instead:
# urls.py
from django.contrib import admin
from django.urls import re_path, include
ulrpatterns = [
re_path('admin/', admin.site.urls),
re_path('^$', include('personal.urls'));
]
and:
# personal/urls.py
from django.urls import re_path, include
from . import views
ulrpatterns = [
re_path('^$', views.index, name="index");
]

django URLconf current path didn't match

Using the URLconf defined in mysite.urls, Django tried these URL patterns, in this order:
polls/ [name='index']
admin/
The current path, polls/, didn't match any of these.
My code is...
from (app)polls urls.py
from django.urls import path
from . import views
urlpatterns = [
path('', views.index, name='index'),
]
from (project)mysite urls.py
from django.urls import include, path
from django.contrib import admin
urlpatterns = [
path('polls/', include('polls.urls')),
path('admin/', admin.site.urls),
]
from views.py project file
from django.shortcuts import render
from django.http import HttpResponse
def index(request):
return HttpResponse("Hello world, you are at the polls index.")
If you want your view index as a home view, the first page to be rendered on the address localhost:port/.
Then,
In polls.urls.py should be (the same as yours):
...
path('', views.index, name='index'),
...
And in project.urls.py
...
path('', include('polls.urls')),
...
It should work.
An extra.
Now if you want to render on the address, lets say, localhost:port/polls
Then your path pattern inside you app.url, (not project.url), would be:
path('polls/', polls_view, name='polls')
Hope it helps.
Since you are accessing localhost:8000, the search path is empty string '' and in your project urls, there are only two pattern for polls and admin. That's why you are getting the error. So you need to access localhost:8000/polls to get the result from index view of polls app.
I am a beginner and I have been troubled for a long time with the same problem.
The key to the problem is the directory:
mysite/
mysite/
polls/
....
I suspect that you have created a new file(urls.py) in mysite(The outermost layer of folders) directory and it's invalid. You should modify the file: mysite/mysite/urls.py
from django.contrib import admin
from django.urls import include, path
urlpatterns = [
path('polls/', include('polls.urls')),
path('admin/', admin.site.urls),
]

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