django: same template tag but in multiple inherited html templates

I use template inheritance in django.

Currently have frame.html and book_detail.html

book_detail.html extends frame.html and I have books_tags.py

# In frame.html
{% load books_tags %}
{% book_list %} # using a tag from books_tags.py



# In books.html
{% extends frame.html %}
{% block content %}
   {% book_list %} # I want to use this from books_tags.py also
{% endblock %}

When I try to use book_list from the same books_tags.py, it gives me syntax error. Alternately, when I put {% load books_tags %} inside book_detail.html first, it again still gives me syntax error.

Invalid block tag: 'book_list', expected 'endblock' or 'endblock content'

Is there any way I can use same template tags in multiple inherited templates? Or do I need to create frame_tags.py and book_detail_tags.py with same def in it?

Si开发者_JAVA百科nce default template filters in django works in multiple inheritance, I'm guessing it should work, but don't know how to get by syntax error.

Thank you.

== UPDATE ==

Add template_tag inside {% block content %} in books.html again.

# In books.html
{% extends frame.html %}
{% block content %}
   **{% load books_tags %}**
   {% book_list %} # I want to use this from books_tags.py also
{% endblock %}

You can use the same template tags in multiple templates, but you have to call {% load books_tags %} in each file, even if there is an inheritance relationship between them.

See https://docs.djangoproject.com/en/dev/topics/templates/#custom-libraries-and-template-inheritance