CODEWITHSUNDEEP
djangodjango-modelsdjango-templatesdjango-views
Henning Lee
Henning Lee

Reputation: 584

Django filter tag not working: AttributeError at / 'str' object has no attribute 'filter_function

According to the Document model below, the 'document.upload.name' in the template will display like "user_NAME/smile.jpg".
I want to split the "user_NAME/smile.jpg" by '/'. So in the template, it will only display "smile.jpg".
I use the 'value.split' in the filter of 'upload_extras'. but the error was: 'str' object has no attribute 'filter_function'.

this is the template:

<td><a href="{{ document.upload.url }}" target="_blank">{{ 
document.upload.name|filename_extract }}</a></td>

this is my function in upload_extras.py

#upload_extras.py
from Django import template 
register =template.Library

@register.filter('filename_extract')
def filename_extract(value):
  '''extract the file name from the upload_to_path'''
       folder, filename = value.split('/')
       return filename

And the last is the model:

 # Create your models here.
 def upload_to_path(instance, filename):
     return 'user_{0}/{1}'.format(instance.user.username, filename)

class Document(models.Model):
     uploaded_at = models.DateTimeField(auto_now_add=True)
     upload = models.FileField(upload_to=upload_to_path)
     user = models.ForeignKey(User, on_delete=models.CASCADE)

Upvotes: 0

Views: 2533

Answers (2)

Henning Lee
Henning Lee

Reputation: 584

from django import template

register = template.Library()

@register.filter('filename')
def filename(value):
    folder, filename=value.split("/")
    return filename

I changed the function name from 'filename_extract' to 'filename'. it is working now. this is a very wired situation.

Upvotes: 0

at14
at14

Reputation: 1204

You need to load your custom filter in the template.

At the top of your template, add

{% load upload_extras %}

Upvotes: 1

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