Python

In a Django application I am building as a project for an online course, I am expecting a link in one template (entry.html) to direct to a path (“edit”) in urls.py with a variable in the url. This should initiate a function called edit in views.py and render the template edit.html.

I am getting a NoReverseMatch error ("Reverse for 'edit' with no arguments not found. 1 pattern(s) tried: ['wiki/(?P<entry>[^/]+)/edit$']") after clicking the link in entry.html. If I view page source while on entry.html in the development server, I can see the url matches that in urls.py but I still get this error.

In the example below, “maggie” is the value for entryTitle I’m trying to pass.

entry.html:

{% block title %}
    {{ entryTitle }}
{% endblock %}

{% block body %}

    {{ entry|safe }}

    <button>
        <a href="{% url 'edit' entry=entryTitle %}">Edit Entry</a>
    </button>

{% endblock %}

urls.py (last path listed is edit)

from django.urls import path

from . import views

urlpatterns = [
    path("", views.index, name="index"),
    path("wiki/<str:entry>", views.entry, name="entry"),
    path("search", views.search, name="search"),
    path("new", views.new_page, name="new"),
    path("wiki/<str:entry>/edit", views.edit, name="edit")
]

edit function in views.py also displaying my entry function

from django.http import HttpResponseRedirect
from django.urls import reverse

class EditPageForm(forms.Form):
    content = forms.CharField(
        widget=forms.Textarea(),
        label="Edit Content:")

def edit(request, entry):
    if request.method == "POST":
        #Edit file and redirect
        form = EditPageForm(request.POST)
        if form.is_valid():
            content = form.cleaned_data["content"]
            util.save_entry(entry, content)
            return HttpResponseRedirect(reverse('entry', kwargs={'entry': entry}))
    else:
        #Load form with initial values filled
        content = util.get_entry(entry)
        form = EditPageForm(initial={"content": content})
        return render(request, "encyclopedia/edit.html", {
            "editform": form,
            "entryTitle": entry
        })

def entry(request, entry):
    markdowner = Markdown()
    entryPage = util.get_entry(entry)
    if entryPage is None:
        return render(request, "encyclopedia/notfound.html", {
            "entryTitle": entry
                      })
    else:
        return render(request, "encyclopedia/entry.html", {
            "entry": markdowner.convert(entryPage),
            "entryTitle": entry
        })

Is anyone able to see what is causing this error with my code? I am surprised because when viewing page source, it seems that {% url 'edit entry=entryTitle %} is being correctly interpreted as wiki/maggie/edit , which is present in urls.py with maggie as <str:entry> and yet I am getting this error.

Here is a screenshot of page source:

Answer

I deleted my previous answer, my apologies. You should make your life easy and restructure your url

path('wiki/edit/<str:entry>', views.edit, name="edit")

<button href="{% url 'edit' entry=entryTitle %}"></button>

This should work.

The previous way was:

path('wiki/<str:entry>/edit', views.edit, name="edit')

I get the error message:

Reverse for 'edit' with keyword arguments '{'entry': ''}' not found. 1 pattern(s) tried: ['so/wiki/(?P<entry>[^/]+)/edit$']

I’m not sure why, but its something to do with it being an object, because passing in a hardcoded string "maggie" instead of entryTitle works fine. Sorry for all the confusion.

Django NoReverseMatch error – urls.py path appears to match

Advertisement

Answer