Django : Passing multiple objects to templates but nothing in there

I wanted to pass two objects to templates, so I put theme in the context and try to send them but failed. I tried few times but it seems like user get objects but comment is always empty even though there are some data in db.

This is views.py

@login_required
def detail(request, article_no):
    if not request.user.is_authenticated():
        return redirect_to_login(next, 'blog/login.html')
else:
    user = request.user

    if 'username' in request.session:
        username = request.session['username']
        item = get_object_or_404(Article, pk=article_no)
        item.hit = Article.objects.filter(pk=article_no).update(hit = item.hit+1)
        #comment = Comment.objects.filter(pk=article_no).order_by('comment_no')
        comment = Comment.objects.all()
        context = {
             'item': item,
             'comment': comment,
            }
    return render(request, 'blog/detail.html', context)

this is models.py

from datetime import datetime
from django.db import models
from django.template.defaultfilters import default

class Article(models.Model):
   no = models.AutoField(primary_key=True)
   title = models.CharField(max_length=50)
   content = models.CharField(max_length=300)
   writer = models.CharField(max_length=50)
   is_visible = models.BooleanField(default=True)
   created_date = models.DateTimeField(editable=False, default=datetime.now())
   hit = models.IntegerField(default=1)

class Comment(models.Model):
    article_no = models.IntegerField(default=1)
    comment_no = models.AutoField(primary_key=True)
    comment_writer = models.CharField(max_length=50)
    comment_body = models.CharField(max_length=300)
    comment_date = models.DateTimeField(editable=False, default=datetime.now())

template

         
         
         
         
         
         
 
                <div class="row">no comment.</div>