NoReverseMatch: Reverse for 'complete' with arguments '(1,)' not found. 1 pattern(s) tried: ['complete/']

Question

urls.py

from django.conf.urls import url
from . import views

urlpatterns = [
url(\'\', views.index, name= \'index\'),
url(\'add\', views.addTodo, name =\'add\')         


        

Answer 1

Well you wrote a path like:

    url('complete/<todo_id>/', views.completeTodo, name='complete'),

But here <todo_id> is part of the url, it does not denote a variable, etc. it means that there is only one url that will match: /complete/<todo_id>.

In case you use django-2.x, you probably want to use path(..) instead:

    path('complete/<todo_id>', views.completeTodo, name='complete'),

Furthermore in case todo_id is typically an integer, it is advisable to specify the type:

    path('complete/<int:todo_id>', views.completeTodo, name='complete'),

For django-1.x, you can not use such path(..)s, and in that case you need to write a regular expression, like:

    url(r'^complete/(?P<todo_id>[0-9]+)$', views.completeTodo, name='complete'),

Answer 2

Your regex expression is wrong:

Instead of this:

url('complete/<todo_id>', views.completeTodo, name='complete'),

try this:

url(r'^complete/(?P<todo_id>\d+)$', views.completeTodo, name='complete'),

Or in case you want to use path

path('complete/<int:todo_id>', views.completeTodo, name='complete'),

EDIT

Since you're using Django 1.*, you can't use path() The correct way to set up all your URLs is with url regex expressions

Note

'^': The match must start at the beginning of the string or line.

'$': The match must occur at the end of the string

'\d+': Match all digits

The r at the beginning stands for regex

url(r'^$', views.index, name= 'index'),
url(r'^add$', views.addTodo, name ='add'),
url(r'^complete/(?P<todo_id>\d+)$', views.completeTodo, name='complete'),
url(r'^deletecomplete$', views.deleteCompleted, name='deletecomplete'),
url(r'^deleteall$', views.deleteAll, name='deleteall')

Answer 3

I was facing the same issue, Here is the solution :

As your model name is Todo (Capital T) you are fetching the ID of each Tudo but in the views, URLs & template you are writing small (t). It becomes case sensitive.

Change the name (todo_id) to (Todo_id) everywhere in the views URLs and HTML template.

Here it is :

urls.py

url('complete/<Todo_id>', views.completeTodo, name='complete'), 

template.html

<a href="{% url 'complete' Todo.id %}">   

views.py

def completeTodo(request, Todo_id):
    todo = Todo.objects.get(pk=Todo_id)