Question

I definitely doing something wrong but I’m not sure what!

In my django project, I created a folder called “templatetags”, in that folder I have:

__init__.py
tags.py

In tags.py:

from datetime import datetime
from django import template
register = template.Library()

@register.filter("timestamp")
def timestamp(value):
    try:
        return datetime.fromtimestamp(value)
    except AttributeError:
        return ''

In one of my templates I call:

{{record.date|timestamp|date:"D d M Y"}}

Yet when I run the template I get the following output error:

Exception Type: TemplateSyntaxError
Exception Value:    
Invalid filter: 'timestamp'

Can someone let me know what I”m doing wrong?

Answer 1

2 things to check
1. Is your app listed in INSTALLED_APPS
2. did you load the custom tag in the file? i.e {% load tags %}