Develop Reference

Cannot query "Product": Must be "Comment" instance

I'm trying to add a commenting and replying system to my products model but I can't add replies to comment.
This is being done in the same page where the product details are being shown to the user.
Edit:
I'm getting a Cannot assign "<Product: Test Product>": "Reply.comment" must be a "Comment" instance. error at new_reply = Reply(content=content, author=self.request.user, comment=self.get_object())
views.py:
class ProductFeedbackView(DetailView):
model = Product
template_name = 'store/product_feedback.html'
def get_context_data(self , **kwargs):
data = super().get_context_data(**kwargs)
connected_comments = Comment.objects.filter(product=self.get_object())
number_of_comments = connected_comments.count()
data['comments'] = connected_comments
data['no_of_comments'] = number_of_comments
data['comment_form'] = CommentForm()
connected_replies = Reply.objects.filter(comment=self.get_object())
number_of_replies = connected_replies.count()
data['replies'] = connected_replies
data['no_of_replies'] = number_of_replies
data['reply_form'] = ReplyForm()
return data
def post(self , request , *args , **kwargs):
if self.request.method == 'POST':
reply_form = ReplyForm(self.request.POST)
if reply_form.is_valid():
content = reply_form.cleaned_data['content']
new_reply = Reply(content=content, author=self.request.user, comment=self.get_object())
new_reply.save()
return redirect(self.request.path_info)
if self.request.method == 'POST':
comment_form = CommentForm(self.request.POST)
if comment_form.is_valid():
content = comment_form.cleaned_data['content']
new_comment = Comment(content=content, author=self.request.user, product=self.get_object())
new_comment.save()
return redirect(self.request.path_info)
models.py:
class Product(models.Model):
author = models.ForeignKey(User, default=None, on_delete=models.CASCADE)
title = models.CharField(max_length=120, unique=True)
description = models.CharField(max_length=300, blank=True, null=True)
class Comment(models.Model):
product = models.ForeignKey(Product, on_delete=models.CASCADE, blank=True, null=True, related_name='comments')
author = models.ForeignKey(User, on_delete=models.CASCADE, blank=True, null=True,)
content = models.CharField(max_length=200, null=True, blank=False)
class Reply(models.Model):
comment = models.ForeignKey(Comment, on_delete=models.CASCADE)
author = models.ForeignKey(User, on_delete=models.CASCADE, blank=True, null=True,)
content = models.TextField(null=True, blank=False)

As the error message suggests, you're trying to assign a Product instance to a field that expects a Comment instance.
This is the line where you try to do this:
connected_replies = Reply.objects.filter(comment=self.get_object())
self.get_object() returns a Product instance as you defined model = Product on your View.
To get the replies connected to your product, you will need to loop over all comments and per comment all its replies as you defined these relations as foreignkeys.
For example:
for comment in connected_comments:
comment_replies = Reply.objects.filter(comment=comment)

#Vincent answer is ok, the error is from wrong model passed to filter of Replay model.
But for remedy to make it easier in template for showing comments and replies to those comments i suggest delete from context
data['replies']
data['no_of_replies']
and in template where you loop through comments (just example):
{% for comment in comments %}
<h1>{{comment}}</h1>
{% for reply in comment.reply_set.all %}
<p>{{ reply }} </p>
{% endfor %}
{% endfor %}
use reverse relationship with reply_set.
Oh, and for optimization add prefetch_related to your query:
Comment.objects.filter(product=self.get_object()).prefetch_related('reply_set')

How to categorize content in Django ? Where is the problem with my work?

I wanted to categorize my site content. Show the category titles in the menu and the contents of each category in the body. I have used these codes.
#urls
path('category/<slug:slug>', views.category, name="category")
#views
def category(request, slug):
context = {
"categorys": get_object_or_404(Category, slug=slug, status=True)
}
return render(request, "blog/category.html", context)
#models
class PostManager(models.Manager):
def published(self):
return self.filter(status='p')
class Category(models.Model):
title = models.CharField(max_length=100, verbose_name="عنوان دسته بندی")
slug = models.SlugField(max_length=200, unique=True, verbose_name="آدرس")
status = models.BooleanField(
default=True, verbose_name="آیا نمایش داده شود؟")
position = models.IntegerField(verbose_name="پوزیشن")
class Meta:
verbose_name = "دسته بندی"
verbose_name_plural = "دسته بندی ها"
ordering = ['position']
def __str__(self):
return self.title
class Post(models.Model):
STATUS_CHOICES = [
('d', 'پیش نویس'),
('p', 'منتشر شده'),
]
title = models.CharField(max_length=100, verbose_name="عنوان")
slug = models.SlugField(max_length=200, unique=True, verbose_name="آدرس")
category = models.ManyToManyField(
Category, verbose_name="دسته بندی", related_name="postcat")
description = models.TextField(verbose_name="توضیحات")
thumbnail = models.ImageField(
upload_to="imgpost", height_field=None, width_field=None, max_length=None, verbose_name="تصویر")
publish = models.DateTimeField(
default=timezone.now, verbose_name="زمان انتشار")
created = models.DateTimeField(
auto_now_add=True, verbose_name="زمان ایجاد")
updated = models.DateTimeField(
auto_now=True, verbose_name="زمان بروزرسانی")
status = models.CharField(
max_length=1, choices=STATUS_CHOICES, verbose_name="وضعیت")
def __str__(self):
return self.title
class Meta:
verbose_name = "پست"
verbose_name_plural = "پست ها"
objects = PostManager()
#template
{% for posts in categorys.postcat.published %}
<p>
posts.title
</p>
<p>
posts.description
</p>
{%endfor%}
The problem is that despite the filter I have set for not displaying draft posts, that post is not displayed in the category section. If you can help. my project in my github

{% for posts in categorys.postcat.published %}
<p>
{{ posts.title }}
</p>
<p>
{{ posts.description }}
</p>
{%endfor%}
try this!

We have to put this line of code in the model, the post class. It was a back fever.
objects = PostManager()

How can i fetch a specific to a variable

Hello i want to fetch a specific field to a variable
For that I have Order model:
class Order(models.Model):
product = models.ForeignKey(
Product, on_delete=models.CASCADE, related_name="product")
customer = models.ForeignKey(Customer, on_delete=models.CASCADE)
quantity = models.IntegerField(default=1)
fname = models.CharField(max_length=100, null=True)
address = models.CharField(max_length=1000, null=True)
phone = models.CharField(max_length=12, null=True)
price = models.IntegerField()
date = models.DateField(datetime.datetime.today, null=True)
status = models.ForeignKey(
Status, on_delete=models.CASCADE, blank=True, null=True)
payment_method = models.ForeignKey(
PaymentMethod, on_delete=models.CASCADE, blank=True, null=True)
total = models.IntegerField(null=True)
Here I want to fetch total field in a variable.But I am new for that reason I am really confused about this topic

There is another method you can use. You would have to define a method or property for the field and then call it in your templates.
models.py
class Order(models.Model):
total = models.IntegerField(null=True)
#property
def get_total(self):
return self.total
views.py
from django.shortcuts import render
from .models import *
def Index(request):
Orders = Order.objects.all()
context = {"Orders":Orders}
return render(request, "template/page.html", context)
page.html
{% for order in Orders %}
{{order.get_total}}
# You can do the same to other field to get them
{% endfor %}

Its quite easy. Since you have defined your models already. All you have to do is to use it in your view.py and then in your templates. Exaple is the below:
view.py
from django.shortcuts import render
from .models import *
def Index(request):
Orders = Order.objects.all()
context = {"Orders":Orders}
return render(request, "template/page.html", context)
page.html
{% for order in Orders %}
{{order.total}}
{{order.price}}
# You can do the same to other field to get them
{% endfor %}

how to split post view on the same page in django

I have no idea if this question make much sense or not but i am so confused about it. I have a post list view and it is rendering some of the post here.
My question is how can I split the sections of the page.something like this.
what should be the approach of making this kind of view.
this is my posts view.py
posts/view.py
class PostListView(ListView):
model = Post
template_name = 'posts/home.html'
context_object_name = 'posts'
ordering = ['-date_posted']
def get_queryset(self):
if not self.request.user.is_authenticated:
return Post.objects.all()[:10]
else :
return super().get_queryset()
posts/models.py
from django.db import models
from django.utils import timezone
from slugger import AutoSlugField
from django.contrib.auth.models import User
from django.urls import reverse
# Create your models here.
def upload_location(instance, filename):
return "%s/%s" %(instance.slug, filename)
class Category(models.Model):
title = models.CharField(max_length= 60)
slug = AutoSlugField(populate_from='title')
parent = models.ForeignKey('self',blank=True, null=True ,related_name='children',on_delete=models.CASCADE)
updated = models.DateTimeField(auto_now=True, auto_now_add=False)
timestamp = models.DateTimeField(auto_now=False, auto_now_add=True)
def __unicode__(self):
return self.title
def __str__(self):
return self.title
class Post(models.Model):
title = models.CharField(max_length=120)
slug = AutoSlugField(populate_from='title')
image = models.ImageField(
upload_to=upload_location,
null=True,
blank=True,
)
category = models.ForeignKey(Category, on_delete=models.CASCADE)
content = models.TextField()
date_posted = models.DateTimeField(default=timezone.now)
author = models.ForeignKey(User, on_delete=models.CASCADE)
def __str__(self):
return self.title
def get_absolute_url(self, slug=None):
return reverse("posts-detail", kwargs={"slug": self.slug})

You have posts assigned to categories. Each post could be assigned only to one category (since you have FK from Post to Category). And you want to display all categories and 10 latest posts under each one.
I see several ways of how to solve that. The easiest one is to extend Category model with property, containing the queryset to retrieve related posts in the way you want them for front page.
class Post(models.Model):
title = models.CharField(max_length=255)
category = models.ForeignKey('Category', on_delete=models.CASCADE, related_name='posts')
date_posted = models.DateTimeField(default=timezone.now)
class Category(models.Model):
title = models.CharField(max_length=255)
#property
def posts_for_frontpage(self):
return self.posts.order_by('-date_posted')[:10]
class FrontpageView(ListView):
model = Category
template_name = 'frontpage.html'
context_object_name = 'categories'
def get_queryset(self):
# select some categories for frontpage
# all by default
return Category.objects.all()
and then in template
{% for category in categories %}
<h1>{{ category.title }}</h1>
<hr />
{% for post in category.posts_for_frontpage %}
<h4>{{ post.title }}</h4>
{% endfor %}
<br />
<br />
{% endfor %}
You could also play with select_related to reduce number of queries and with annotate to get all related posts.

For loop counter in Django, numbers not showing up

I'm looking to have a counter of numbers from one to ten using a for loop counter in Django, but I don't see any numbers. I don't really understand what I need to put in {{counter}} and {{value}} when looking at the documentation.
List.html
<p class="number">
{% for key, value in data.items %}
{{counter}}: {{value}}
{% endfor %}
<p>
models.py
from django.db import models
from django.core.urlresolvers import reverse
# Create your models here.
class FullArticleQuerySet(models.QuerySet):
def published(self):
return self.filter(publish=True)
class FullArticle(models.Model):
title = models.CharField(max_length=150)
author = models.CharField(max_length=150)
slug = models.SlugField(max_length=200, unique=True)
pubDate = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
category = models.CharField(max_length=150)
heroImage = models.CharField(max_length=250, blank=True)
relatedImage = models.CharField(max_length=250, blank=True)
body = models.TextField()
publish = models.BooleanField(default=True)
gameRank = models.CharField(max_length=150, blank=True, null=True)
objects = FullArticleQuerySet.as_manager()
def __str__(self):
return self.title
def get_absolute_url(self):
return reverse("FullArticle_detailed", kwargs={"slug": self.slug})
class Meta:
verbose_name = "Blog entry"
verbose_name_plural = "Blog Entries"
ordering = ["-pubDate"]
views.py
from django.views import generic
from . import models
from .models import FullArticle
# Create your views here.
class BlogIndex(generic.ListView):
queryset = models.FullArticle.objects.published()
template_name = "list.html"
randomArticle = FullArticle.objects.order_by('?').first()
class BlogDetail(generic.DetailView):
model = models.FullArticle
template_name = "detailed.html"

use {{ forloop.counter }} instead of just {{ counter }}
Also, you are never defining the dictionary data anywhere. What is this supposed to be? Your queryset?