Flask custom module import working locally fine, errors with app platform

I have a flask app with the following structure


I define helper as the following to use globally without the need for importing it into every page

from app import app
import helper

def inject_user():
    return dict(helper=helper)

When I test the app locally, I can safely use helper.* functions in templates, however, after deploying with app platform I get the following error

{{ helper.format_date(p.birth_date) }}
jinja2.exceptions.UndefinedError: 'helper' is undefined

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Bobby Iliev
Site Moderator
Site Moderator badge
April 10, 2024

Hi there,

It’s generally a good practice to use absolute imports to avoid such issues. What you can try doing is to modify the import statement in to reflect the full path:

from orthocms import helper

I’m assuming here that orthocms is a package, and helper is a module in that package.

If this still does not work, as a debugging step, you can temporarily import helper directly in the template or view where it’s used to see if that resolves the issue. If it does, the problem is likely with how the context is passed or with the import path.

# In the view function
from orthocms import helper

Let me know how it goes!



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