Disable Jinja template caching for certain filter

Question

We have a custom Jinja filter that we use for creating cache busting URL for our Javascript and CSS resources. We now noticed that in our production environment the final, c

Answer 1

After lots of Googling, I finally found the real solution to this. Jinja has a special helper called contextfilter that you can use to decorate your function with to make your filter context-aware (and context-dependent). The Jinja bytecode cache will not cache this computed value, even when a constant is passed as input.

In your filter in Python:

from jinja2 import contextfilter

@contextfilter
def asset_url(context, url):
    return some_url_thing(url)

In your template: