Inclusion tag error ..... Invalid template library specified. ImportError raised when trying to load

Question

index.html has a block containing the context from a view called init in the crudapp app.Index.html also has a block called sidebar_files which I trying to populate using an inclusion tag. I have created an inclusion tag in fileuploader/templatetags/fileuploader_tags.py,

from django.db import models
from .models import FileModel
from django import template
register = template.Library()

@register.inclusion_tag('sidebar_files.html')
def file_sharing_sidebar():
    file_model = FileModel.objects.all().reverse()
    return {'file_model': file_model}

Also that directiory does contain an empty inti.py file (using double underscores). In the project template files I have the sidebar_files.html with the load tags,

{% load fileuploader_tags %}
{% block sidebar %}
    {% for item in file_model %}
      .... blah .....
    {% endfor %}
  {% endif %}
</div>
{% endblock %}

The app is included in INSTALLED_APPS. My main index.html file used the fileuploader_tag and tries to use the sidebar_file.html template like this,

{% load staticfiles %}
{% load fileuploader_tags %}
......
{% block sidebar %} {% file_sharing_sidebar %}{% endblock %}

I have restarted the dev server. The error I get is,

Invalid template library specified. ImportError raised when trying to load 'fileuploader.templatetags.fileuploader_tags': No module named models

and specifically mentions this line from crudapp/view.py

return render(request, 'forum.html', context)

and is specific to the main view called 'init' which sends its context to forum.html. This template is a block in index.html. Here is the 'init' view,

def init(request):
    postModel = list(PostModel.objects.raw('SELECT *, max(pub_date), count(topic_id) AS freq, count(DISTINCT author) AS contributors FROM crudapp_postmodel GROUP BY topic_id ORDER BY pub_date DESC'))
    paginator = Paginator(postModel, 8)
    page2 = request.GET.get('page')
    try:
        forum_model = paginator.page(page2)
    except PageNotAnInteger:
        # If page is not an integer, deliver first page.
        forum_model = paginator.page(1)
    except EmptyPage:
        # If page is out of range (e.g. 9999), deliver last page of results.
        forum_model = paginator.page(paginator.num_pages)

    blogModel = BlogModel.objects.all().order_by('pub_date').reverse()
    paginator = Paginator(blogModel, 5)
    page = request.GET.get('blog')
    try:
        blog_model = paginator.page(page)
    except PageNotAnInteger:
        # If page is not an integer, deliver first page.
        blog_model = paginator.page(1)
    except EmptyPage:
        # If page is out of range (e.g. 9999), deliver last page of results.
        blog_model = paginator.page(paginator.num_pages)
    # context = {'blog_model': blog_model}

    totalposts = PostModel.objects.annotate(Count('post'))
    totalusers = User.objects.annotate(Count('id'))
    totalfiles = FileModel.objects.filter(approved=True).annotate(Count('upload'))
    totalarticles = BlogModel.objects.filter(approved=True).annotate(Count('article'))
    totalviews = TopicModel.objects.aggregate(numviews = Sum('views'))
    # If there are topis with no posts the number of topics below will still be correct
    totaltopics = PostModel.objects.aggregate(numtopics = Count('topic__id', distinct=True))
    context = {'blog_model': blog_model, 'forum_model': forum_model, 'current_time':   timezone.now(), 'totalarticles': totalarticles, 'totalfiles': totalfiles, 'totalposts': totalposts, 'totaltopics': totaltopics, 'totalusers': totalusers, 'totalviews': totalviews}
    return render(request, 'forum.html', context)

I have used the inclusion tag before once, successfully, but can't get it to work here. Any help would be greatly appreciated,

Thanks

Solution

As the error suggests, Python is failing to find a models module. The problem is this line in your fileuploader_tags.py:

from .models import FileModel

Which will try to look for a models.py in the same directory as the current file. Change it to:

from fileuploader.models import FileModel

(This assumes your app is called fileuploader).

or, to use a relative path, assuming models.py is located in the same directory as templatetags/:

from ..models import FileModel