django: reverse() fails when passing extra options to view function-CodePudding

I'm struggling with an annoying error with Django, I'm trying a reverse() passing metadata as a Python dictionary (I'm following the documentation but it does't work, can you help me figure out what I'm missing? )

This is my urlpattern (as you can see I'm passing extra options to my view function, as described in the docs):

from django.urls import path
from . import views

urlpatterns = [
    ...,
    path("items/<int:item_id>", views.item_page, { 'message': None }, name="item page")
]

On my views.item_page function I have this: as

...

reversed_url = reverse("item page", kwargs={'item_id': item_id, 'message': 'hello'} )

return HttpResponseRedirect(reversed_url)

I'm getting this kind of error:

Django Version:     4.0.4
Exception Type:     NoReverseMatch
Exception Value:    Reverse for 'item page' with keyword arguments '{'item_id': 2, 'message': 'hello'}' not found. 1 pattern(s) tried: ['items/(?P<item_id>[0-9] )\\Z']

It's like it doesn't accept the "message" argument when reversing.

CodePudding user response：

reverse will accept only the arguments those exist in the urlpattern in your pattern there is no message **if you want to send messages ** you can use the messages module in django

from django.contrib import messages 

# in View
messages.success(request, 'Hello')
...

See the Docs for Sending messages

CodePudding user response：

Another way to pass somewhat structured extra information to the next view is to populate its request.GET with a Querydict. Something like

qd = QueryDict( mutable=True)
qd['whatever'] = 'whatever' # populate it as you wish next view's request.GET to be
...
url = reverse('myapp:wherever', kwargs={ ...} ) # kwargs as defined in urls.py
return HttpResponseRedirect( url   '?'   qd.urlencode() )