Django template for loop is empty

Question

I am trying to build a detail view in django, but nothing is displayed in the template.

views.py

class MyDetailView(DetailView):
    model = Article
    template_name = 'detail.html'

detail.html

{% extends 'base.html' %}
{% load i18n %}
{% endblock %}

{% block content %}

{% for item in itemlist %}
{{item.pk}}
{{item.title}}

{% empty %}
There are no items in this list

{% endfor %}
{% endblock %}

Why is nothing displayed in the template here?

A `DetailView` has no `itemlist` passed to the template, (and a `ListView` neither). — Willem Van Onsem, Mar 26 '20 at 18:44

score 1 · Answer 1 · answered Mar 26 '20 at 18:47

1

You do not pass a item with the name itemlist to the template in a DetailView. In a ListView (which looks more appropriate), it will by default use a context variable named object_list. Since the variable is not present, the {% for … %}…{% endfor %} template block [Django-doc] will be resolved to the empty string.

If you want to pass the queryset of Articles to the context through the itemlist name, you can set the context_object_name attribute [Django-doc]:

from django.views.generic import ListView

class MyDetailView(ListView):
    model = Article
    template_name = 'detail.html'
    context_object_name = 'itemlist'

answered Mar 26 '20 at 18:47

Willem Van Onsem

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I already tryed, but then I get this Error `TypeError at /detail/5/ 'Article' object is not iterable Request Method: GET Request URL: http://127.0.0.1:8000/detail/5/` – Snowball Mar 26 '20 at 19:12
Maybe is this because my URL? `path('detail//', views.MyDetailView.as_view(), name='detail'),` – Snowball Mar 26 '20 at 19:13
@Snowball: for a `DetailView` the item is of course not iterable, since *one* article, well is not a collection of iterables. – Willem Van Onsem Mar 26 '20 at 19:14
@Snowball: give you have a `DetailView`, why do you use a `{% for ... %}` loop in the first place? – Willem Van Onsem Mar 26 '20 at 20:31

score 0 · Answer 2 · answered Mar 26 '20 at 19:16

0

As Willem told you in the comment, you're in a details view so you don't need a for loop to iterate , you can just show the details in the template like: {{item.pk}}

answered Mar 26 '20 at 19:16

JohnJerry

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2
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But when I use `ListView`, then I have all results and not only this one `PK` what I want – Snowball Mar 26 '20 at 19:41

Django template for loop is empty

2 Answers2