Why am I getting a No Reverse Match error? - django

Question

I'm trying to add delete functionality to my Django project, and I seem to be stuck in a loop whenever I try to access my health_hub_history page.
I keep getting the below error, which I know is to do with my urls.py setup, but I have commented it out- so I really don't know why I'm still getting the error!
Error message:
NoReverseMatch at /MyHealth/history
Reverse for 'delete_entry' not found. 'delete_entry' is not a valid view function or pattern name.
Views.py:
from django.shortcuts import render, get_object_or_404, redirect
from django.views import View, generic
from .models import HealthStats
from .forms import StatUpdateForm
def home(request):
return render(request, 'home.html')
def health_hub(request):
latest = HealthStats.objects.filter(user=request.user).latest('date')
context = {
"user": latest.user,
"weight": latest.weight,
"date": latest.date,
"run_distance": latest.run_distance,
"run_time": latest.run_time,
}
return render(request, 'health_hub.html', context)
def health_history(request):
serialized_stats = []
for stats in HealthStats.objects.filter(user=request.user):
serialized_stats.append({
"user": stats.user,
"weight": stats.weight,
"date": stats.date,
"run_distance": stats.run_distance,
"run_time": stats.run_time,
})
context = {
"stats": serialized_stats
}
return render(request, 'health_hub_history.html', context)
class UpdateHealth(View):
def get(self, request, *args, **kwargs):
stats = HealthStats
update_form = StatUpdateForm
context = {
'stats': stats,
'update_form': update_form,
'user': stats.user,
'weight': stats.weight,
'date': stats.date,
}
return render(request, 'health_hub_update.html', context)
def post(self, request, *args, **kwargs):
stats = HealthStats
update_form = StatUpdateForm(data=request.POST)
context = {
'stats': stats,
'update_form': update_form,
'user': stats.user,
'weight': stats.weight,
'date': stats.date,
'run time': stats.run_time,
'run distance': stats.run_distance
}
if update_form.is_valid():
update_form.save()
return render(request, 'health_hub_update.html', context)
# def delete_entry(request, entry_id):
# entry = get_object_or_404(HealthStats, id=entry_id)
# entry.delete()
# return redirect("health_hub_history")
urls.py:
from django.urls import path
from django.contrib.staticfiles.storage import staticfiles_storage
from django.views.generic.base import RedirectView
from . import views
app_name = 'HealthHub'
urlpatterns = [
path('', views.home, name='home'),
path('MyHealth/', views.health_hub, name='health_hub'),
path('MyHealth/update', views.UpdateHealth.as_view(), name='health_hub_update'),
path('MyHealth/history', views.health_history, name='health_hub_history'),
path('favicon.ico', RedirectView.as_view(url=staticfiles_storage.url("favicon.ico"))),
# path('MyHealth/delete_entry/<id>', views.delete_entry, name='delete_entry'),
]
health_hub.html (button from which the error occurs):
<a href="{% url 'HealthHub:health_hub_history' %}"><button class="btn btn-primary btn-lg">View my Health
History</button></a>
health_hub_history.html:
{% extends 'base.html' %}
{% load static %}
{% block content %}
<div class="container-fluid">
<div class="row">
<div class="col-sm-12 text-center">
<h1>My Health History</h1>
</div>
</div>
</div>
<div class="container-fluid">
<div class="row justify-content-center">
<div class="col-auto text-center p-3">
<table class="table table-striped table-hover table-bordered">
<tr>
<td>User:</td>
<td>Weight (lbs):</td>
<td>Date:</td>
<td>Run Distance (km):</td>
<td>Run Time (HH:MM:SS):</td>
<td>Action</td>
</tr>
{% for stat in stats %}
<tr>
<td>{{ stat.user }}</td>
<td>{{ stat.weight }} </td>
<td>{{ stat.date }}</td>
<td>{{ stat.run_distance }}</td>
<td>{{ stat.run_time }}</td>
<!-- Button trigger modal -->
<td>
<button type="button" class="btn btn-danger" data-bs-toggle="modal"
data-bs-target="#staticBackdrop">
Delete
</button>
</td>
<!-- Modal -->
<div class="modal fade" id="staticBackdrop" data-bs-backdrop="static" data-bs-keyboard="false"
tabindex="-1" aria-labelledby="staticBackdropLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="staticBackdropLabel">Are you sure you want to delete
this entry?</h5>
<button type="button" class="btn-close" data-bs-dismiss="modal"
aria-label="Close"></button>
</div>
<div class="modal-body">
If you just need to amend something, try the edit button.
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary"
data-bs-dismiss="modal">Cancel</button>
<!-- <a href="{% url 'delete_entry' entry_id %}"><button class="btn btn-danger">I'm -->
sure</button></a>
</div>
</div>
</div>
</div>
</tr>
{% endfor %}
</table>
</div>
</div>
</div>
{% endblock content %}
I don't understand how it can all be commented out, but it's still trying to access the 'delete_entry' view?

Answer 1

Django does not ignore HTML comments, you need to use a special tag :
{% comment "Optional note" %}
<a href="{% url 'delete_entry' entry_id %}"><button class="btn btn-danger">
{% endcomment %}
https://docs.djangoproject.com/en/4.1/ref/templates/builtins/#comment