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Python Django ORM Basic ORM Usage Take Control

Changes to course_nav and course_extras cause an error

NoReverseMatch at /courses/ Reverse for 'detail' with arguments '()' and keyword arguments '{'pk': ''}' not found. 1 pattern(s) tried: ['courses/(?P<pk>\d+)/$']

course_extras

@register.inclusion_tag('courses/course_nav.html')
def nav_courses_list():
    courses = Course.objects.filter(published=True).values()[:5]
    return {'courses': courses}

course_nav

{% for course in courses %}
    <li><a href="{% url 'courses:detail' pk=course.id %}">{{ course.title }}</a></li>
{% endfor %}

I think your function should return more than only your arguments.

Thanks @Heidi, my brain is elsewhere today, and this was 5 months ago. I am going to retake the course from scratch.