In views.py file ==> category_posts = Post.object.filter(category=cat) returns an empty query set. The 'Post' model has sample posts with categories

2022-05-04 10:02 Apaar imported from Stackoverflow

I am creating a blog application in django where i encountered this unusual issue. I am not being able to filter and display blog posts category wise. Please find my code below. Thanks in advance. I have spent two full days trying to figure this out and still got nothing.

MODELS.py

This is the model which i have created for a blog post.

class Post(models.Model):
    title = models.CharField(max_length=255)
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    body = models.TextField()
    post_date = models.DateField(auto_now_add=True)
    category = models.CharField(max_length=255, default="uncategorized")

    def __str__(self):
        return self.title + ' | ' + str(self.author)

    def get_absolute_url(self):
        #return reverse('article-detail', args=(str(self.id)))
        return reverse('homepage')

VIEWS.py

This is the view that i have created for a category wise blog posts.

def CategoryView(request,cat):
    category_posts = Post.objects.filter(category=cat)
    return render(request,'categories.html',{'category_posts':category_posts})

URLS.py

The urls.py file.

path('category/<str:cat>/', CategoryView, name = 'category'),

CATEGORIES.html

This will be the final display page where the category_posts is displayed as an empty queryset. The for loop is unable to run because category_posts is an empty queryset. Single word categories are also empty(to rule out a slugify issue)

{% extends 'base.html' %}
{% load static %}
{% block content %}

<ul>
{% for post in category_posts %}
<li>
    <div class="category">
      <a href="{% url 'category' post.category|slugify %}">{{ post.category }}</a>
    </div>
    <a href="{% url 'article-detail' post.pk  %}">
      <h3><b>{{ post.title }} </b></h3>
      <p class=card-date>
        <big>{{ post.author }}</big>
        <small>-{{ post.post_date }}</small>
      </p>
      <p class="excerpt-text">{{ post.body | slice:"100" |safe}}</p>
      <div class="article-thumbnail">
         <img src="{% static "images/bg.png" %}" alt="article-thumbnail" >
      </div>
     <div class="overlay">
    </a>
</li>
{% endfor %}

{% endblock %}

See also questions close to this topic

Python File Tagging System does not retrieve nested dictionaries in dictionary

I am building a file tagging system using Python. The idea is simple. Given a directory of files (and files within subdirectories), I want to filter them out using a filter input and tag those files with a word or a phrase.

If I got the following contents in my current directory:

data/
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   world_building_budget.txt
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hello_world.dat
world_builder.spec

and I execute the following command in the shell:

py -3 tag_tool.py -filter=world -tag="World-Building Tool"

My output will be:

These files were tagged with "World-Building Tool":
data/ world_building_budget.txt
hello_world.dat
world_builder.spec

My current output isn't exactly like this but basically, I am converting all files and files within subdirectories into a single dictionary like this:

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Right now, my dictionary looks like this: key:''.

In the following function, I am turning the empty values '' into empty lists (to hold my tags):

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When I run my entire code, this is my output:

hello_world.dat ['World-Building Tool']
world_builder.spec ['World-Building Tool']

But it does not see data/world_building_budget.txt. This is the full dictionary:

{'data': {'world_building_budget.txt': []},  
'a.txt': [],
'hello_world.dat': [], 
'b.exe': [], 
'world_builder.spec': []}

This is my full code:

import os, argparse


def fs_tree_to_dict(path_):
    file_token = ''
    for root, dirs, files in os.walk(path_):
        tree = {d: fs_tree_to_dict(os.path.join(root, d)) for d in dirs}
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def empty_str_to_list(d):
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        elif isinstance(v, dict):
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parser.add_argument("--tag", action="store", help="a tag phrase to attach to a file")
parser.add_argument("--get_tagged", action="store", help="retrieve files matching an existing tag")

args = parser.parse_args()

filter = args.filter
tag = args.tag
get_tagged = args.get_tagged
current_dir = os.getcwd()

files_dict = fs_tree_to_dict(current_dir)
empty_str_to_list(files_dict)

for k, v in files_dict.items():
    if filter in k:
        if v == []:
            v.append(tag)
            print(k, v)

        elif isinstance(v, dict):
            empty_str_to_list(v)

    if get_tagged in v:
        print(k, v)

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