Register custom filter in django

python django django-templates django-template-filters

24,180

First of all, you haven't defined register:

To be a valid tag library, the module must contain a module-level variable named register that is a template.Library instance, in which all the tags and filters are registered.

Also, I usually decorate the function with register.filter:

from django import template

register = template.Library()

@register.filter
def intcomma(value):
    return value + 1

24,180

Author by

user2954587

mediocre at best django, angular, rails

Updated on July 09, 2022

Comments

user2954587 almost 2 years
My filter is not being registered and not sure where it's getting tripped up.

In test/templatetags
```
__init__.py
test_tags.py
```
test_tags.py includes
```
from django import template

register.filter('intcomma', intcomma)

def intcomma(value):
    return value + 1
```
test/templates includes pdf_test.html with the following contents
```
{% load test_tags %} 
<ul>
    <li>{{ value |intcomma |floatformat:"0"</li>
</ul>
```
float format works fine but no luck on intcomma
user2954587 almost 10 years

That's not my issue, you can use both methods as described in the docs
alecxe almost 10 years

@user2954587 yup, but still, you didn't have register defined.
user2954587 almost 10 years

Understood, but still not working. Any other ideas or ways to test what's going on?
user2954587 almost 10 years

no errors. I'm finding it tough to debug as it seems it's failing 'silently' or it's just not even getting called
alecxe almost 10 years

@user2954587 ok, what if you omit |floatformat:"0" and try it with only intcomma filter applied?
alecxe almost 10 years

@user2954587 also, I suspect there could be another reason. There is a built-in intcomma filter from django.contrib.humanize. Try renaming your filter to smth different.
user2954587 almost 10 years

tried that and no luck. I've been restarting the server too and that doesn't seem to be the issue.
user2954587 almost 10 years

extremely stupid error on my part with collectstatic. Thank you for your patience!