NoReverseMatch at / Reverse for 'profile' with arguments '('',)' not found. 1 pattern(s) tried: ['profile/(?P<name>[^/]+)/$']

Question

I am a beginner in learning code and am working on making a simple django site where users can write comments but I keep getting this error

My urls.py

from django.urls import path

from . import views

urlpatterns = [
    path("", views.index, name="index"),
    path("login", views.login_view, name="login"),
    path("logout", views.logout_view, name="logout"),
    path("register", views.register, name="register"),
    path("profile/<str:name>/", views.profile, name="profile")
]

views.py

class NewPostForm(forms.Form):
    title = forms.CharField(label="Title")
    description = forms.CharField(widget=forms.Textarea)

def index(request):
    if request.method == "POST":
        form = NewPostForm(request.POST)
        if form.is_valid():
            title = form.cleaned_data['title']
            description = form.cleaned_data['description']
            author = request.user

            post = NewPost(title=title, description=description, author=author)
            post.save()
            return HttpResponseRedirect(reverse("index"))
        else:
            return render(request, "network/index.html", {
                "form": form
            })

    return render(request, "network/index.html", {
        "form": NewPostForm(),
        "posts": NewPost.objects.all()
    })

models.py

from django.contrib.auth.models import AbstractUser
from django.db import models


class User(AbstractUser):
    pass

class NewPost(models.Model):
    title = models.CharField(max_length=32)
    description = models.CharField(max_length=256)
    author = models.ForeignKey(User, on_delete=models.CASCADE, null=True)

and my index.html

{% extends "network/layout.html" %}

{% load static %}
{% load crispy_forms_tags %}

{% block body %}
    <div class="form-group">
        <form method="post" action="{% url 'index' %}">
            {% csrf_token %}
            {{form | crispy}}
            <button class="btn btn-primary"> Post </button>
        </form>
    </div>

    {% for post in posts %}
        <div class="card">
            <div class="card-body"> Title: {{post.title}} </div>
            <div class="card-body"> Description: {{post.description}}</div>
            <p> {{post.author.username}} </p>
            <div class="card-body">
                <a href="{% url 'profile' post.author.username %}">
                    @{{post.author.username}}
                </a>
            </div>
        </div>
    {% endfor %}
{% endblock %}

But I keep getting

NoReverseMatch at / Reverse for 'profile' with arguments '('',)' not found. 1 pattern(s) tried: ['profile/(?P[^/]+)/$']

Answer 1

It looks like the error is occurring with

<a href="{% url 'profile' post.author.username %}">

Make sure that each of these posts that you are looping through actually has an author and that each author has a username. Django won't be able to properly construct the url if post.author.username is None.

Answer 2

in this url : path("profile/str:name/", views.profile, name="profile")

do you have an view called profile?

and what does name in str:name refer to? username maybe? or author

you need to provide more details,

Answer 3

Maybe you need to check your admin panel if there is a post without author that's probably the problem

Answer 4

NoReverseMatch at / Reverse for 'profile' with arguments '('',)' not found. 1 pattern(s) tried: ['profile/(?P[^/]+)/$']

It's means something missing in database thats you are working for in loops .Django won't be able to properly construct the url if somthing is blank. First go to the Django admit panel and find whats are missing.Example:Author,User,Admin etc.