Problem using template tags

I am having difficulty using template tags in my templates. For example this works

In the view:

from __future__                 import absolute_import
import rules
...
def detail(request, slug):
    obj = get_object_or_404(NewsStory, slug=slug)
    return render(request, 'news/detail.html', {
        'story': obj,
        'can_publish_newsstory': rules.has_perm('can_publish_newsstory', request.user)
        })

In the template

       {% if can_publish_newsstory %}
        <li><a href="{% url 'news:edit' story.slug %}" class="button expand secondary">Edit Story</a></li>
        <li><a href="{% url 'news:delete' story.slug %}" class="button expand secondary">Delete Story</a></li>
        {% endif %}

If I change this to remove ‘can_publish_newsstory’ from the view and include it in the template, nothing shows.

Revised Template

{% load rules %}
{% has_perm 'can_publish_newsstory' user as can_publish_newsstory %}
       {% if can_publish_newsstory %}
        <li><a href="{% url 'news:edit' story.slug %}" class="button expand secondary">Edit Story</a></li>
        <li><a href="{% url 'news:delete' story.slug %}" class="button expand secondary">Delete Story</a></li>
        {% endif %}

I am using Python 2.

[cfra]

I was pulling out my hair over a problem which appears very similar to the one described here.

In my case, the problem was caused by using the has_perm template tag outside of a block.

While this parses without any warnings, the tag will never be called and its return value is not available in the scope where it is needed.

I was able to resolve it like this:

--- a/apps/example/templates/example/thing_frobnicate.html
+++ b/apps/example/templates/example/thing_frobnicate.html
@@ -6,11 +6,10 @@
 {% load thumbnail %}
 {% load wagtailcore_tags %}
 
-{% has_perm 'example.frobnicate_thing' user thing as frobnication_is_authorized %}
-
 {% block body_class %}frobnication-info{% endblock %}
 
 {% block content %}
+   {% has_perm 'example.frobnicate_thing' user thing as frobnication_is_authorized %}
    <div class="pageheader">
        {% if frobnication_is_authorized %}

Posting this in the hopes that it might help others to avoid debugging the template tag for multiple hours.

[dfunckt]

I’m closing the issue for now. If you get a test project together or you find it’s even remotely related to rules please feel free to reopen and post back.