Question 277644 in Html Question posted in
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Html – Reverse for 'category_2' with arguments '('',)' not found

I want whenever I click on the category,
I can see the available categories and by clicking on each one I can display the products of that category and again by clicking on the product name, I can see the page of that product.
Here, clicking on the category in the first step will display this error. what’s the reason

in views.py:

def product_detail(request, product_id):
    product = get_object_or_404(Product, pk=product_id)
    comments = Comment.objects.filter(product=product)
    offers = PriceOffer.objects.filter(product=product).order_by('-offer_price')
    off_list = [float(product.first_bid)]
    maximum = float(product.first_bid)


    if request.method == 'POST':
    
    #comment
    #offer


    context = {
        'product': product,
        'comments': comments, 
        'offers': offers,
        'off' : off
    }

    return render(request, 'auctions/product_detail.html', context)

def category(request):
    categories = Category.objects.all()
    return render(request, 'auctions/category.html', {'categories': categories})

def category_2(request,cat_id):
    category = Category.objects.get(id=cat_id)
    products = Product.objects.filter(category=category)
    return render(request, 'auctions/product_detail.html', {'category': category, 
    'products': products})

urls.py:

path("product_detail/<int:product_id>/", views.product_detail, 
name="product_detail"),
path("category", views.category, name="category"),
path("category_2/<int:cat_id>/", views.category_2, name="category_2"),

category.html:

{% extends "auctions/layout.html" %}
{% block body %}
    <h3><a href="{% url 'category_2' cat_id %}">{{ category.name }}</a></h3>
{% endblock %}

product_detail.html(Only the relevant part):

<h2>{{ category.name }}</h2>
{% for product in products %}
    <h3>{{ product.name }}</h3>
{% endfor %}

layout.html(Displays the linked category at the top of the page):

{% load static %}

<!DOCTYPE html>
<html lang="en">
    <head>
        <title>{% block title %}Auctions{% endblock %}</title>
    </head>
    <body>
        <h1>Auctions</h1>
         <div>
            {% if user.is_authenticated %}
                Signed in as <strong>{{ user.username }}</strong>.
            {% else %}
                Not signed in.
            {% endif %}
       </div>
       <ul class="nav">
            <li class="nav-item">
                <a class="nav-link" href="{% url 'index' 
                  %}">Active Listings</a>
            </li>

            <li class="nav-item">
                <a class="nav-link" href="{% url 'category' 
                   %}">Category</a>
            </li>

        {% if user.is_authenticated %}
            <li class="nav-item">
                    <a class="nav-link" href="{% url 'logout' 
            %}">Log Out</a>
            </li>
        {% else %}
            <li class="nav-item">
                <a class="nav-link" href="{% url 'login' %}">Log In</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="{% url 'register' %}">Register</a>
            </li>
        {% endif %}
    </ul>
    <hr>
    {% block body %}
    {% endblock %}
</body>

error:

Request Method: GET
Request URL: http://127.0.0.1:8000/category
File "C:UsersNaziDesktoptestcommerceauctionsviews.py", 
line 128, in category
return render(request, 'auctions/category.html', {'categories': 
categories})
Exception Type: NoReverseMatch at /category
Exception Value: Reverse for 'category_2' with arguments '('',)' 
not found. 1 pattern(s) tried: ['category_2/(?P<cat_id>[0- 
9]+)/\Z']
Tags:

2

Answers


  1. 0

    The reason you are getting an error when you click on a category is because you are calling the wrong view function. In your category.html template, you are using the {% url 'category_2' cat_id %} tag to generate the URL for the category link. This tag should be used when you are linking to a category detail page, which is what the category_2() view function is for. However, when you click on a category in the first step, you want to be taken to a page that lists all of the products in that category. This is what the category() view function is for.

    To fix the error, you should change the {% url 'category_2' cat_id %} tag in your category.html template to {% url 'category' cat_id %}. This will ensure that when you click on a category, you are taken to the correct view function.

    Here is an example of the corrected category.html template:

    {% extends "auctions/layout.html" %}
{% block body %}
    <h3><a href="{% url 'category' cat_id %}">{{ category.name }}</a></h3>
{% endblock %}

    Once you have made this change, your code should work as expected. You will be able to click on a category to see a list of all the products in that category, and you will be able to click on a product name to see the page for that product.

    Login or Signup to reply.
  2. 0

    Given I understand it correctly, you want to determine the URL for a category. Since there are multiple categories, you will need to loop over the categories, and for each category then use the corresponding primary key, so:

    {% extends "auctions/layout.html" %}
{% block body %}
  {% for category in categories %}
    <h3><a href="{% url 'category_2' category.pk %}">{{ category.name }}</a></h3>
  {% endfor %}
{% endblock %}
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