I made this custom filter to check if an image exists or not:
from django import template
from django.core.files.storage import default_storage
register = template.Library()
@register.filter(name='file_exists')
def file_exists(filepath):
if default_storage.exists(filepath):
return filepath
else:
index = filepath.rfind('/')
new_filepath = filepath[:index] + '/image.png'
return new_filepath
And I used this in the template like this:
<img src="{{ STATIC_URL }}images/{{ book.imageurl }}|file_exists" alt="{{book.title}} Cover Photo">
But it doesn't work. And I have no idea why.
You are not applying the filter because |file_exists
is outside of {{}}
. Try this:
<img src="{{ STATIC_URL }}images/{{ book.imageurl|file_exists }}" alt="{{book.title}} Cover Photo">
Or, if you want to apply file_exists
to the whole image url, try this:
<img src="{{ STATIC_URL|add:'images/'|add:book.imageurl|file_exists }}" alt="{{book.title}} Cover Photo">