Django : debugging templatetags

Question

How on earth do people debug Django templatetags?

I created one, based on a working example, my new tag looks the same to me as the existing one. But I just get a

'my_lib' is not a valid tag library: Could not load template library from django.templatetags.my_lib, No module named my_lib

I know that this is probably because of something failing when defining the lib. But how do I see what's going on?

What do you use to debug this situation?

Answer 1

This sounds like Django can't find the python file your template tag is defined in. Django finds custom tags in a folder named templatetags in your apps folders.

So if you have an app called Books, and you're calling {% load book_tags %} in your template, your Books app folder should look something like this:

• Books
  • __init__.py
  • views.py
  • models.py
  • templatetags
    • __init__.py
    • book_tags.py

Make sure that __init__.py file is in templatetags.