I am sorry for long explanation I am newbie to Django and come across a book titled "Tango with Django" version 1.9 but I am coding mine in the latest version of Django i.e 3.2. But when I came to chapter 6 I get stucked because slug. I tried my level best to resolve but merely spent hours without anything. So this is a brief of what I want to do, I have a django project called tango_with_django_project, and I created new app called rango so inside the rango app in mode.py I created my models including slug. The problem I am getting is whenever I write the route in urls.py it raises an exception of
TypeError at /rango/category/other-frameworks/ cannot unpack non-iterable Category object Request Method: GET Request URL: http://127.0.0.1:8000/rango/category/other-frameworks/ Django Version: 3.2.7 Exception Type: TypeError Exception Value:
cannot unpack non-iterable Category object Exception Location: C:\Users\Userpc\code\env\lib\site-packages\django\db\models\sql\query.py, line 1283, in build_filter Python Executable: C:\Users\Userpc\code\env\Scripts\python.exe Python Version: 3.8.5 Python Path:
['C:\Users\Userpc\code\tango_with_django_project', 'C:\Program Files (x86)\Python38-32\python38.zip', 'C:\Program Files (x86)\Python38-32\DLLs', 'C:\Program Files (x86)\Python38-32\lib', 'C:\Program Files (x86)\Python38-32', 'C:\Users\Userpc\code\env', 'C:\Users\Userpc\code\env\lib\site-packages'] Server time: Sat, 16 Oct 2021 14:20:06 0000
#my urls.py from django.urls import path from rango import views
urlpatterns = [
path('', views.index, name='index'),
path('about/', views.about),
path('index/', views.index),
path('category/<slug:category_name_slug>/',views.show_category, name='show_category'),
]
#views.py
from django.shortcuts import render
from rango.models import Category, Page
from rango.models import Page
def show_category(request, category_name_slug):
context_dict = {}
try:
category = Category.objects.get(slug=category_name_slug)
pages = Page.objects.filter(category)
context_dict['pages'] = pages
context_dict['category'] = category
except Category.DoesNotExist:
context_dict['category'] = None
context_dict['pages'] = None
return render(request, 'rango/category.html', context_dict)
def index(request):
category_list = Category.objects.order_by('-likes')[:5]
context_dict = {'categories': category_list}
return render(request, 'rango/index.html', context=context_dict)
def about(request):
context_dict = {'mss': "This tutorial has been put together by Yusuf"}
return render(request,'rango/about.html', context=context_dict)
<!DOCTYPE html>
<html>
<head>
<title>Rango</title>
</head>
<body>
<div>
{% if category %}
<h1>{{ category.name }}</h1>
{% if pages %}
<ul>
{% for page in pages %}
<li><a href="{{ page.url }}">{{ page.title }}</a></li>
{% endfor %}
</ul>
{% else %}
<strong> No pages curently in category.</strong>
{% endif %}
{% else %}
The specified category does not exist!
{% endif %}
</div>
</body>
</html>
#MODEL.PY
from django.db import models
from django.template.defaultfilters import slugify
class Category(models.Model):
name = models.CharField(max_length=128,unique=True)
views = models.IntegerField(default=0)
likes = models.IntegerField(default=0)
slug = models.SlugField(null=True)
def save(self, *args, **kwargs):
self.slug = slugify(self.name)
super(Category, self).save(*args, **kwargs)
class Meta:
verbose_name_plural = 'categories'
def __str__(self):
return self.name
class Page(models.Model):
category = models.ForeignKey(Category, on_delete=models.CASCADE)
title = models.CharField(max_length=128)
url = models.URLField()
views = models.IntegerField(default=0)
likes = models.IntegerField(default=0)
def __str__(self):
return self.title
CodePudding user response:
You can not use category
to filter in pages = Page.objects.filter(
. It is not clear for what field you would filter the page, you thus need to specify the field that links to the category, and filter with:category)
category = Category.objects.get(slug=category_name_slug)
pages = Page.objects.filter(category=category)
In your view you should render the page outside the try
-except
block, so:
def show_category(request, category_name_slug):
context_dict = {}
try:
category = Category.objects.get(slug=category_name_slug)
pages = Page.objects.filter(category=category)
context_dict['pages'] = pages
context_dict['category'] = category
except Category.DoesNotExist:
context_dict['category'] = None
context_dict['pages'] = None
# outside the try-except ↓
return render(request, 'rango/category.html', context_dict)