Develop Reference

Categorizing Posts in Django?

I am having a problem in categorize Posts. I have categories in Post Model, Please help me solve this issue!
MODELS.PY
html= "html"
css= "css"
python= "python"
javascript = "javascript"
Lang=(
(html,"HTML"),
(css,"CSS"),
(python,"PYTHON"),
(javascript,"JAVASCRIPT")
)
Broilerplate = "Broilerplate"
Simple_Tags = "Simple Tags"
Elements = "Elements"
Webpages = "Webpages"
Category = (
(Broilerplate,"BROILERPLATE"),
(Simple_Tags,"Simple tags"),
(Elements,"Elements"),
(Webpages,"Webpages")
)
class Post(models.Model):
title = models.CharField(max_length=75)
subtitle = models.CharField(max_length=150)
language_1 = models.CharField(max_length=100, choices=Lang, default=html)
content_1= models.TextField(blank=True)
language_2 = models.CharField(max_length=100, choices=Lang,blank=True)
content_2= models.TextField(blank=True)
language_3 = models.CharField(max_length=100, choices=Lang,blank=True)
content_3= models.TextField(blank=True)
language_4 = models.CharField(max_length=100, choices=Lang,blank=True)
content_4= models.TextField(blank=True)
language_5 = models.CharField(max_length=100, choices=Lang,blank=True)
content_5= models.TextField(blank=True)
category= models.CharField(max_length=100, choices=Category, default=Broilerplate)
date_posted = models.DateTimeField(default=timezone.now)
author = models.ForeignKey(User,on_delete=models.CASCADE)
def __str__(self):
return self.title
# def update(self):
# updated_at = timezone.now()
# self.save(updated_at)
def get_absolute_url(self):
return reverse('post-detail', kwargs={'pk':self.pk})
VIEWS.PY
def search_by_category(request, category):
if request.post.objects.filter(pk=request.post.id).first().category == 'Broilerplate':
nor = request.post.objects.filter(pk=request.post.id).first().category
print(nor)
posts = Post.objects.filter(category='Broilerplate')
category = posts.first().category
print(category)
context = {'posts': posts, 'title': category , 'category': category}
return render(request, 'category.html', context)
else:
context = {'title': category , 'category': category}
return render(request, 'category.html', context)
URLS.PY
urlpatterns = [
path('html/',PostListView.as_view(), name='CodeWriter_Homepage'),
path('python/',views.CodeWriter_homepage_python, name='CodeWriter_Homepage_python'),
path('search/', views.search, name='search'),
path('categroize-by/<str:category>/', views.search_by_category, name='search_by_category'),
path('post-details/<int:pk>/',PostDetailView.as_view(), name='Post_details_page'),
path('post-update/<int:pk>/',PostUpdateView.as_view(), name='Post_update_page'),
path('post-delete/<int:pk>/',PostDeleteView.as_view(), name='Post_delete_page'),
path('user/<str:username>/', UserPostListView.as_view(), name='user-post'),
path('new-post/',PostCreateView.as_view(), name='New-post_page')
]
CATEGORY.html
How can I get the data of the post category in views.py?That will help me very much!
{% block main_post_body %}
<main class="post-body normal" >
<p class="post-heading"> Post for <b>{{ category }}</b> :</p>
{% comment %} <h1 class="mb-3">Search results for <b>{{category}}</b>: </h1> {% endcomment %}
{% comment %} {% if posts|length < 1 %}
<h3>No search results found</h3>
<p>Your search results for <b>{{ query }}</b> is not found.</p>
{% endif %} {% endcomment %}
{% for post in posts %}
<div class="row">
<div class="col span-8-of-12 card">
<div class="row">
<!-- <div class="triangle"></div>
<div class="person-info-card">
<div class="row">
<div class="col"><img src="{% static 'resoures/css/img/Me.jpg' %}" alt=""></div>
<div class="col">
<p>Ketan Vishwakarma</p>
<p class="post-no">126 Posts | 1k Followers</p>
</div>
</div>
</div> -->
<div class="col span-1-of-12">
<div class="person-img" id="person-info-card-toggle">
<img src="{{ post.author.profile.image.url }}" alt="" />
</div>
</div>
<div class="col span-7-of-12">
<h3>{{ post.title }} </h3>
<h4>{{ post.subtitle }}</h4>
</div>
<div class="col span-1-of-12">
<span class="ion-md-heart-empty"></span>
</div>
<div class="col span-1-of-12">
<span class="ion-md-add-circle-outline"></span>
</div>
<div class="col span-1-of-12 share">
<span class="ion-md-share"></span>
<ul class="dropdown-list-share">
<li><span class="ion-md-copy"> Copy</span></li>
<li><span class="ion-logo-whatsapp"> Share on Whatsapp</span></li>
<li><span class="ion-logo-facebook"> Share on facebook</span></li>
<li><span class="ion-md-more"> More</span></li>
</ul>
</div>
<div class="col span-1-of-12">
<span class="ion-md-menu"></span>
<ul class="dropdown-list">
<li>Doesn't work</li>
<li>Report</li>
<li>Report</li>
</ul>
</div>
</div>
<div class="tabs">
<ul class="tabs-list">
<li class="active">{{ post.language_1 }}</li>
{% if post.content_2 == "" %}
{% else %}
<li class="not-clickable hint--info" aria-label="To view this click Read more">{{ post.language_2 }}</li>
{% endif %}
{% if post.content_3 == "" %}
{% else %}
<li class="not-clickable hint--info" aria-label="To view this click Read more">{{ post.language_3 }}</li>
{% endif %}
{% if post.content_4 == "" %}
{% else %}
<li class="not-clickable hint--info" aria-label="To view this click Read more">{{ post.language_4 }}</li>
{% endif %}
{% if post.content_5 == "" %}
{% else %}
<li class="not-clickable hint--info" aria-label="To view this click Read more">{{ post.language_5 }}</li>
{% endif %}
<ul class="categories">
<abbr title="Categiores">
<a href="">
<span class="ion-md-code-working"></span>
{{ post.category }}
</a>
</abbr>
<!-- <li>Broilerplate</li> -->
</ul>
</ul>
<div id="tab1" class="tab active">
<p>
<pre><code class="language-{{ post.language_1 }}">
{{ post.content_1 }}
</code></pre>
</p>
</div>
<div id="tab2" class="tab">
<p>
<pre><code class="language-{{ post.language_2 }}">
{{ post.content_2 }}
</code></pre>
</p>
</div>
<div id="tab3" class="tab">
<p>
<pre><code class="language-{{ post.language_3 }}">
{{ post.content_3 }}
</code></pre>
</p>
</div>
<div id="tab4" class="tab">
<p>
<pre><code class="language-{{ post.language_4 }}">
{{ post.content_4 }}
</code></pre>
</p>
</div>
<div id="tab5" class="tab">
<p>
<pre><code class="language-{{ post.language_5 }}">
{{ post.content_5 }}
</code></pre>
</p>
</div>
</div>
<span class="ion-md-arrow-round-down"> Read More</span>
<h6>{{ post.date_posted|date:"F d, Y" }}</h6>
</div>
<div class="col span-4-of-12 main-card ">
<div class="card-small">
<h1>Result: </h1>
<div class="result-box">
<iframe src="" frameborder="0">just for fun</iframe>
</div>
<h6>{{ post.date_posted|date:"F d, Y" }}</</h6>
</div>
</div>
</div>
{% endfor %}
</main>
{% if is_paginated %}
{% if page_obj.has_previous %}
<a class="btn btn-outline-info mb-4" href="?page=1">First</a>
<a class="btn btn-outline-info mb-4" href="?page={{ page_obj.previous_page_number }}">Previous</a>
{% endif %}
{% for num in page_obj.paginator.page_range %}
{% if page_obj.number == num %}
<a class="btn btn-info mb-4" href="?page={{ num }}">{{ num }}</a>
{% elif num > page_obj.number|add:'-3' and num < page_obj.number|add:'3' %}
<a class="btn btn-outline-info mb-4" href="?page={{ num }}">{{ num }}</a>
{% endif %}
{% endfor %}
{% if page_obj.has_next %}
<a class="btn btn-outline-info mb-4" href="?page={{ page_obj.next_page_number }}">Next</a>
<a class="btn btn-outline-info mb-4" href="?page={{ page_obj.paginator.num_pages }}">Last</a>
{% endif %}
{% endif %}
{% endblock main_post_body %}
NoteI have registered the Post model in admin.py
Tell me the solution to this problem I cannot get the solution I have been trying it for so long and am stuck on this.

PageNotAnInteger at /products/ That page number is not an integer

So I'm trying to use pagination in django, When I click on previous it takes me to localhost:8000/thatpage/?page= when it is supposed to take me to the previous page, It also gives me error on that page. I have tried handling it in my views.py but it doesn't work.
I have also tried using books_obj.previous_page_number but that doesn't work too.
I'm using Django 3.1
views.py
def showproducts(request):
oof = CartItem.objects.filter(user=request.user).values_list('book', flat=True)
lmao = OrderItem.objects.filter(user=request.user).values_list('book', flat=True)
hehe = CartItem.objects.filter(user=request.user)
category = Category.objects.all()
haha = Paginator(Book.objects.all(), 2)
page = request.GET.get('page')
if page is None or "":
page = 1
fianlprice = 0
for item in hehe:
fianlprice += item.book.price
# books = Book.objects.all()
books = haha.page(page)
return render(request, 'main/products.html', {'books':books, 'price':fianlprice, 'cart':oof, 'order':lmao, 'category':category})
products.html
<h1>Products</h1>
<h1>{{ error }}</h1>
{% if user.is_authenticated %}
<h1>Your cart currently costs ${{ price }}</h1>
{% else %}
<h1>Please login to view your cart</h1>
{% endif %}
<form method="GET" action="/search/">
<label>Choose a category</label>
<select name="category" id="category">
<option value="All" selected>All</option>
{% for name in category %}
<option value="{{ name.name }}">{{ name.name }}</option>
{% endfor %}
</select>
<input type="text" placeholder="Search here" name="search" id="search">
<button type="submit">Search</button>
</form>
{% for book in books %}
<h3>{{ book.name }}</h3>
<img src= "/media/{{ book.image }}" alt="">
<p>{{ book.description }}</p>
{% if not user.is_authenticated %}
<p>Please login</p>
{% else %}
{% if book.id in cart %}
<form method="POST" action="/removefromcartforhome/">
{% csrf_token %}
<button type="submit" name="removeid" value="{{ book.id }}">remove item from cart</button>
</form>
{% elif book.id in order %}
<h3>You already own this</h3>
{% else %}
<form method="POST" action="/addtocartforhome/">
{% csrf_token %}
<button type="submit" name="bookid" value="{{ book.id }}">Add to cart</button>
</form>
{% endif %}
{% endif %}
{% endfor %}
{% if books.has_other_pages %}
{% if books.has_previous %}
<li class="page-item">
«
</li>
{% else %}
<li class="page-item disabled">
<a class="page-link">«</a>
</li>
{% endif %}
{% for i in books.paginator.page_range %}
{% if books.number == i %}
<li class="page-item active">
<a class="page-link">{{i}}</a>
</li>
{% else %}
<li class="page-item">
{{i}}
</li>
{% endif %}
{% endfor %}
{% if books.has_next %}
<li class="page-item">
»
</li>
{% else %}
<li class="page-item disabled">
<a class="page-link">»</a>
</li>
{% endif %}
{% else %}
<p>no pages</p>
{% endif %}

Change this code from:
if page is None or "":
page = 1
to
page = request.GET.get('page', None)
if page == None or page == "":
page = 1
# or
if not page:
page = 1
Update
You can use http referee to redirect to previous page:
if not page:
return HttpResponseRedirect(request.META.get('HTTP_REFERER'))

Filters not following on pagination in Django

I'm trying to set up pagination within my Django project but I can't find a way to make the filters (ptags in my case) follow to the next pages.
Ps; I use Django-haystack with faceting for filtering.
I have a custom forms.py
from haystack.forms import FacetedSearchForm
class FacetedProductSearchForm(FacetedSearchForm):
def __init__(self, *args, **kwargs):
data = dict(kwargs.get("data", []))
self.ptag = data.get('ptags', [])
super(FacetedProductSearchForm, self).__init__(*args, **kwargs)
def search(self):
sqs = super(FacetedProductSearchForm, self).search()
if self.ptag:
query = None
for ptags in self.ptag:
if query:
query += u' OR '
else:
query = u''
query += u'"%s"' % sqs.query.clean(ptags)
sqs = sqs.narrow(u'ptags_exact:%s' % query)
return sqs
That I pass in my Views:
class FacetedSearchView(BaseFacetedSearchView):
form_class = FacetedProductSearchForm
facet_fields = ['ptags']
template_name = 'search_result.html'
paginate_by = 3
context_object_name = 'object_list'
Here's my full search_result.html:
<div>
{% if page_obj.object_list %}
<ol class="row top20" id="my_list">
{% for result in page_obj.object_list %}
<li class="list_item">
<div class="showcase col-sm-6 col-md-4">
<div class="matching_score"></div>
<a href="{{ result.object.get_absolute_url }}">
<h3>{{result.object.title}}</h3>
<h5>{{ result.object.destination }}</h5>
<img src="{{ result.object.image }}" class="img-responsive">
</a>
<div class="text-center textio">
<ul class="tagslist">
<li class="listi">
{% for tags in result.object.ptags.names %}
<span class="label label-info"># {{ tags }}</span>
{% endfor %}
</li>
</ul>
</div>
</div>
</li>
{% endfor %}
</ol>
</div>
I'm able to pass the query which is a destination to the next page by adding this at the bottom of my html:
{% if is_paginated %}
<ul class="pagination pull-right">
{% if page_obj.has_previous %}
<li><i class="fas fa-angle-left"></i>Previous page</li>
{% else %}
<li class="disabled"><span><i class="fas fa-angle-left"></i>Previous page</span></li>
{% endif %}
{% if page_obj.has_next %}
<li>See more results<i class="fas fa-angle-right"></i></li>
{% else %}
<li class="disabled"><span>See more results<i class="fas fa-angle-right"></i></span></li>
{% endif %}
</ul>
{% endif %}
{% else %}
<p> Sorry, no result found for the search term <strong>{{query}} </strong></p>
{% endif %}
But If I try to add the ptags field within the pagination code by doing &ptags like this:
{% if is_paginated %}
<ul class="pagination pull-right">
{% if page_obj.has_previous %}
<li><i class="fas fa-angle-left"></i>Previous page</li>
{% else %}
<li class="disabled"><span><i class="fas fa-angle-left"></i>Previous page</span></li>
{% endif %}
{% if page_obj.has_next %}
<li>See more results<i class="fas fa-angle-right"></i></li>
{% else %}
<li class="disabled"><span>See more results<i class="fas fa-angle-right"></i></span></li>
{% endif %}
</ul>
{% endif %}
{% else %}
<p> Sorry, no result found for the search term <strong>{{query}} </strong></p>
{% endif %}
I get this error when I go to page 2 and the selected checkboxes filters (ptags) are not following:
Page not found (404)
Request Method: GET
Request URL: http://localhost:8000/search/?q=las%20vegas&ptags=&page=2
Raised by: search.views.FacetedSearchView
How can I fix this?

Your template pagination code is removing the extra filter parameters, use this -
In your my_tags.py add this template tag:
#register.simple_tag(name='url_replace')
def url_replace(request, field, value):
d = request.GET.copy()
d[field] = value
return d.urlencode()
paginate as -
{% if is_paginated %}
<br>
<div class="row">
<div class="col-12">
<ul class="pagination float-right">
{% if page_obj.has_previous %}
<li class="page-item"><a class="page-link" href="?{% url_replace request 'page' page_obj.previous_page_number %}">«</a></li>
{% else %}
<li class="page-item disabled"><span class="page-link">«</span></li>
{% endif %}
{% for i in paginator.page_range %}
{% if page_obj.number == i %}
<li class="active page-item"><span class="page-link">{{ i }} <span class="sr-only">(current)</span></span></li>
{% else %}
<li class="page-item"><a class="page-link" href="?{% url_replace request 'page' i %}">{{ i }}</a></li>
{% endif %}
{% endfor %}
{% if page_obj.has_next %}
<li class="page-item"><a class="page-link" href="?{% url_replace request 'page' page_obj.next_page_number %}">»</a></li>
{% else %}
<li class="page-item disabled"><span class="page-link">»</span></li>
{% endif %}
</ul>
</div>
</div>
{% endif %}

Looping over items with Jinja, adding in div after every 5th item

Problem
I have a list of 100 golf courses and I'm looking to insert a div, containing an image for an ad after every fifth course. How would I go about doing this?
Update #1
content.html (Revised, newest version)
I've updated my original code snippet because off of leovp's
suggested edited below. I'm having trouble showing only {% if content.featured == "Test" %} and wondering how I should closing my if-else statement.
{% for content in COPY.courses %}
<div class="course course--featured">
<img src="" class="course__image image--region">
<div class="course__inner">
<div class="course__wrapper">
{% if content.state == "MO" %}
<p class="course__state">Missouri</p>
{% elif content.state == "IL" %}
<p class="course__state">Missouri</p>
{% endif %}
</div>
<div class="course__wrapper">
<p class="course__name name--region">{{ content.name }}</p>
</div>
<p class="course__desc">{{ content.description }}</p>
</div>
</div>
{% if loop.index % 5 == 0 %}
<div class="advertising advertising--inline">
<div class="ad ad--rect">
<div class="text-center hidden-xs">
<div id="fixed-leaderboard-region-top"
class="dfp-ad"
data-dfp-custom-pos="fixed-leaderboard-top, htf"
data-dfp-size="[728,90]">
</div>
</div>
<div class="text-center hidden-sm hidden-md hidden-lg">
<div id="fixed-leaderboard-region-top-mobile"
class="dfp-ad"
data-dfp-custom-pos="fixed-leaderboard-top, htf"
data-dfp-size="[320,50]">
</div>
</div>
</div>
</div>
{% endif %}
{% endfor %}
</div>
content.html (Previous, old version for comparision)
I've looked into using batch from this Stack Overflow question that seemed similar, but I'm unsure if this solves my problem?
{% for content in COPY.courses %}
{% if content.featured == "Test" %}
<div class="course__inner">
<div class="course__wrapper">
{% if content.state == "MO"%}
<p class="course__state">Missouri</p>
{% elif content.state == "IL" %}
<p class="course__state">Illinois</p>
{% endif %}
</div>
<div class="course__wrapper">
<p class="course__name name--home">{{ content.name }}</p>
</div>
<p class="course__desc">{{ content.description }}</p>
</div>
{% endif %}
{% endfor %}

While iterating, you can get the current index and check if it's divisible by 5:
{% set count = 0 %}
{% for content in COPY.courses %}
{% if content.featured == "Test" %}
<div class="course course--featured">
<img src="" class="course__image image--home">
[...]
</div>
</div>
{% set count = count + 1 %}
{% if count % 5 == 0 %}
<!-- additional content once every 5 courses -->
{% endif %}
{% endif %}
{% endfor %}
NOTE: This approach no longer works after version 2.10.
For detail see:
How to increment a variable on a for loop in jinja template?

How to use for in another for cycle in django

I'm building some kind of list in which we have Section and Category assigned to the section.
In my view.py it looks like this:
args['sections'] = ShopSection.objects.all().order_by('name')
args['categories'] = ShopCategory.objects.all().order_by('-name')
And my template looks like this:
<div class="panel side-panel-1">
<h4 class="title1">Разделы</h4>
<ul class="clear-list">
<li class="">
Все разделы
</li>
{% for section in sections %}
<li class="">
<!--{{ section.name }}-->
<a class="" data-dropdown="autoCloseExample" aria-controls="autoCloseExample" aria-expanded="false">
{{ section.name }} ({{ section.shopcategory_set.count }}) {{section.shopcategory_set.id}} {{ section.id }}
</a>
<ul id="autoCloseExample" class="f-dropdown" data-dropdown-content tabindex="-1" aria-hidden="true" aria-autoclose="false" tabindex="-1">
{% for category in categories %}
{% if section.id == category.section_id%}
<li style="width: 100%;">{{ category.name }} sec={{section.id}} cat={{category.id}} catsec={{category.section_id}}</li>
{% else %}
{% endif %}
{% endfor %}
</ul>
{% endfor %}
</ul>
The working page is here.
The problem is when I use {% if section.id == category.section_id %} I want to filter category list according to the section id, but section.id is not defining properly.
For example:
If I use {% if section.id > 3 %} then in cycle it defines section.id as 4
If i use {% if section.id < 3 %} then in cycle it defines section.id as 2
what i want is
-Section id-1
--Category1 which has section_id-1
--Category2 which has section_id-1
--Category3 which has section_id-1
-Section id-2
--Category4 which has section_id-2
--Category5 which has section_id-2
--Category6 which has section_id-2

If the ShopCategory has a ForeignKey to ShopSection, the cleanest and easiest way to do so is to change your second for loop like this so you don't have to check on the section_id:
{% for category in section.shopcategory_set.all %}
<li style="width: 100%;">{{ category.name }} sec={{section.id}} cat={{category.id}} catsec={{ section.id }}</li>
{% endfor %}