Django How to Post comment on only one List item - html

Question

I am trying to create django commerce app I am little bit stuck on a thing
When I post comment via form I created
<form action="{% url 'comment' list_id.id %}" method="POST">
{% csrf_token %}
<textarea name="comment" class="inp-cmt" rows="3"></textarea>
<input type="submit">
</form>
the comment is posted but it post on all of my list page I wanted only on the page where comment is posted
my comment section
{% if allcomments %}
<h1>Comments</h1>
<div class="card-cmt">
{%for com in allcomments%}
<li style="list-style: none;">
<footer class="post-info">
<span>{{com.user}}</span>
<p>{{com.text}}</p>
</footer>
</li>
{% endfor %}
</div>
{% endif %}
my urls
urlpatterns = [
path("", views.index, name="index"),
path("login", views.login_view, name="login"),
path("logout", views.logout_view, name="logout"),
path("register", views.register, name="register"),
path("newlist", views.create_listing, name="new_list"),
path("item", views.add_item, name="new_item"),
path("listing/<int:list_id>", views.listing, name="listing"),
path("delete/<int:item_id>", views.delete_list, name="delete"),
path("comment/<int:list_id>", views.comments, name="comment")
]
my views for comment and listing
def comments(request, list_id):
coms = Comments()
if request.method == 'POST':
coms.user = request.user.username
coms.text = request.POST.get('comment')
coms.listid = list_id
coms.save()
return redirect('listing', list_id)
else :
return redirect('index')
def listing(request, list_id):
list_item = Listing.objects.get(id=list_id)
return render(request, "auctions/listing.html",{
"list_id" : list_item,
"allcomments" : Comments.objects.all()
})
models
class Listing(models.Model):
owner = models.CharField(max_length =64,default="N/A")
productname = models.CharField(max_length=100)
price = models.DecimalField(max_digits=10, decimal_places=2)
description = models.CharField(max_length=999, default="test")
date = models.DateField(auto_now_add=True)
link = models.CharField(max_length=200, default="test1")
def __str__(self):
return f"{self.owner} {self.productname} {self.price} {self.date} {self.description} {self.link}"
class Comments(models.Model):
user = models.CharField(max_length=64)
text = models.TextField()
date = models.DateTimeField(auto_now_add=True)
listid = models.IntegerField(default=0)
def __str__(self):
return f"{self.user} {self.text} {self.date} {self.listid}"

Answer 1

You're returning all comments on every listing when you do "allcomments" : Comments.objects.all()
The problem is in your listing function. Try this instead:
def listing(request, list_id):
list_item = Listing.objects.get(id=list_id)
return render(request, "auctions/listing.html",{
"list_id" : list_item,
"allcomments" : Comments.objects.filter(listid=list_id)
})
Notice the change - from "allcomments" : Comments.objects.all() to "allcomments" : Comments.objects.filter(listid=list_id)
Also, your implementation for class Comments and class Listing could be a bit better. Have you ever come across something called a ForeignKey? It will be a lot more efficient to use that. https://docs.djangoproject.com/en/3.1/ref/models/fields/#django.db.models.ForeignKey