Develop Reference

Content not visible on webpage

I am creating a database website with python and django. My problem is that the content I try to get data from my class' fields doesn't appear on the id-page on django. I am able to make a successful search, and I get links for my searches. The name-field is visible in searches and on the page, but nothing else appears. When I click on the link, I go to luokka_id/number. I must be missing something but can't figure out what the problem is.
models.py
class luokka(models.Model):
nimi = models.CharField('Pääkäyttöluokka', max_length=100)
vara = models.CharField('Varakäyttöluokka', max_length=100)
varaaja = models.CharField('Varakäyttöluokka', max_length=100)
def __str__(self):
return self.nimi
and on the näytä_luokka.html (show class):
{% extends 'tietokanta/base.html' %}
{% block content %}
<center>
{{luokkalistaus}}
{{luokka}}
{{ luokka.nimi }}
{{ luokka.vara }}
{{ luokka.varaaja }}
</center>
{% endblock %}
and views.py:
def näytä_luokka(request, luokka_id):
luokkalistaus = luokka.objects.get(pk=luokka_id)
return render(request, 'tietokanta/näytä_luokat.html',
{'luokkalistaus': luokkalistaus})
I don't get any errors to help me out here. It's just an empty page, but it should show some extra data.

You have named the key of context as luokkalistaus not luokka, so the template should be:
{% extends 'tietokanta/base.html' %}
{% block content %}
<center>
{{ luokkalistaus.nimi }}
{{ luokkalistaus.vara }}
{{ luokkalistaus.varaaja }}
</center>
{% endblock %}

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

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">
{{ post.category }}
</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 %}

I can't display posts only with a boolean field set to true in my template

In short - I have a bootstrap carousel and it works nicely, however I can't get it to display only fields with 'featured' set to 'true'
I have tried doing for post in posts.objects.featured (the carousel literally does not show up at all then) and variations like posts.objects.filter(featured=True) (it says it can't parse the remainder).
Here's the code from the template where I am trying to display the carousel image only with items with featured=True
{% for post in posts.objects.featured %}
<div class="carousel-item {% if forloop.first %}active{% endif %} ">
{% image post.image fill-1920x500 %}
<div class="carousel-caption d-none d-md-block">
<h2 id="inner-carousel-title">{{post.title}}</h2>
<h4><a href="{% pageurl post %}" style="color:white;text-shadow:2px 2px 4px #000000" >something</a></h4>
</div>
</div>
{% endfor %}
Again, I just want the carousel to show up only with featured posts
As a side note- it'd be awesome if it only showed 3 posts.
EDIT - Here's my model.py for the page
class BlogPage(RoutablePageMixin, Page):
description = models.CharField(max_length=240, blank=True)
content_panels = Page.content_panels + \
[FieldPanel("description", classname="full")]
def get_context(self, request, *args, **kwargs):
context = super(BlogPage, self).get_context(request, *args, **kwargs)
context['posts'] = self.posts
context['blog_page'] = self
return context

If you really want to do this in the template do:
{% for post in posts %}
{% if post.featured %}
<div> ... <div/>
{% endif %}
{% endfor %}
But you can also pass only the featured posts to your template in your view. Just add:
...
featured_posts = Post.objects.filter(featured=True)[:4]
return render('post_list.html', {'featured_posts': featured_posts, ...})
If you’re using Django’s generic ListView and you’re only showing the featured posts, you can set the queryset property to filter only the featured posts. If you’re also showing the other posts in your ListView, add the featured_posts to your context by overriding get_context_data().

You can try this if the way I suggested in the comment doesn't work
{% for post in posts %}
{% if post.featured %}
// write down your stuff
{% endif %}
{% endfor %}

Django: How to display author of query of posts?

I'm trying to make individual pages for each author showing their name and posts. I can't seem to get the username displayed.
views.py
class UserProfileView(generic.ListView):
template_name = 'howl/user-profile.html'
context_object_name = 'user_howls'
def get_queryset(self):
author = self.request.user
u = User.objects.get(username=author)
return Howl.objects.filter(author=u)
models.py
class Howl(models.Model):
author = models.ForeignKey(User, null=True)
content = models.CharField(max_length=150)
Here is where I'm stuck.
user-profile.html
{% extends 'howl/base.html' %}
{% block content %}
<h1>User: {{user_howl.author}}</h1>
{% for user_howl in user_howls %}
<ul>
<li>{{user_howl.content}}</li>
</ul>
{% endfor %}
{% endblock %}
The content is displayed just fine, but the heading just says "User: ", how do I give it a context without using a for loop?
I've tried:
{% for author in user_howls.author %}
<h1>User: {{author}}</h1>
{% endfor %}
and
{% if user_howls.author %}
<h1>User: {{user_howl.author}}</h1>
{% endif %}
Still the same outcome, displaying "User: "

user_howls is a queryset so it won't have an author attribute, you need to get the author of the iterated object
{% for howl in user_howls %}
<h1>User: {{ howl.author}}</h1>
{% endfor %}
More to the point though, it doesn't make sense to start from a Howl list, when you are just returning the results for the user_profile, nor does it make sense to use a ListView. so instead, start from the user and then look up its howls
user_obj.howl_set.all()

Since your queryset is based on the posts belonging to the current user, you can shortcut all of this and just show the user directly:
User: {{ user }}

Python/Django - Get value of a ManyToManyField in a for tag

I can't get the image related value when I'm using {% for %} with the class Article. I tried with select_related, but I don't know how to define image to be correctly in displayed in the src="" attribute of my <img /> tag
Is there a clean way to make appear as I want?
models.py
class Image(models.Model):
gallery = models.ManyToManyField(Gallery)
name = models.CharField(max_length=100)
image = models.ImageField(upload_to='static/images/gallery')
def __str__(self):
return self.name
class Article(models.Model):
section = models.ForeignKey(Menu)
title = models.CharField(max_length=100)
text = models.TextField()
type = models.ForeignKey(Type)
image = models.ManyToManyField(Image)
def __str__(self):
return self.title
views.py
def index(request):
slider = Article.objects.all()
images = Image.objects.all()
return render(request, 'cms/index.html', locals())
template
{% for i in slider %}
<li>
<img src="{{i.image}}" alt="{{i.title}}"/>
<h2>{{i.title}}</h2>
<p>{{i.text}}, {{i.image_url}}</p>
</li>
{% endfor %}

You have to use 2 forloop for displaying images in manytomany table.
{% for i in slider %}
<li>
{% for im in i.image.all %}
<img src="{{im.image.url}}" alt="{{im.name}}"/>
{% endfor %}
<h2>{{i.title}}</h2>
<p>{{i.text}}, {{i.image_url}}</p>
</li>
{% endfor %}

Article.image is a ManyToMany field. Which image You want to display? First?
<img src="{{i.image.all.0.image.url}}" alt="{{i.title}}"/>
All?
{% for im in i.image.all %}
<img src="{{im.image.url}}" alt="{{im.name}}"/>
{% endfor %}