Nice dynamic upload_to method for Django FileField or ImageField

common.py

from django.contrib.sites.models import Site
import uuid

def upload_to(instance, filename):
    
    current_site = Site.objects.get_current()
    extension = filename.split(".")[-1]

    instance_slug = getattr(instance,"slug",False)
    if not instance_slug:
        instance_slug = str(uuid.uuid4()).replace("-","")

    return "{0}/uploads/{1}/{2}/{3}-{4}.{5}" . format (current_site.domain, instance._meta.app_label, instance._meta.module_name, instance_slug, instance.pk, extension)

models.py

...
image = models.ImageField(upload_to=upload_to)
...