Cleanup Files (and Images) On Model Delete in Django

In Django, if you delete a model that has Filefield or Imagefield, the related files aren't deleted from the filesystem. You can fix that in two steps:

1. Add filecleanup function, that'll take care of deleting files attached to a model:

   import os
   from django.core.files.storage import default_storage
   from django.db.models import FileField
   
   
   def file_cleanup(sender, **kwargs):
       """
       File cleanup callback used to emulate the old delete
       behavior using signals. Initially django deleted linked
       files when an object containing a File/ImageField was deleted.
   
       Usage:
       >>> from django.db.models.signals import post_delete
       >>> post_delete.connect(file_cleanup, sender=MyModel, dispatch_uid="mymodel.file_cleanup")
       """
       for fieldname in sender._meta.get_all_field_names():
           try:
               field = sender._meta.get_field(fieldname)
           except:
               field = None
   
       if field and isinstance(field, FileField):
           inst = kwargs["instance"]
           f = getattr(inst, fieldname)
           m = inst.__class__._default_manager
           if (
               hasattr(f, "path")
               and os.path.exists(f.path)
               and not m.filter(
                   **{"%s__exact" % fieldname: getattr(inst, fieldname)}
               ).exclude(pk=inst._get_pk_val())
           ):
               try:
                   default_storage.delete(f.path)
               except:
                   pass
   

2. In models.py, add post_delete signal to catch model deletion event:

   models.py

   from django.db import models
   from django.db.models.signals import post_delete
   from .utils import file_cleanup
   
   # ... models code goes here ...
   
   post_delete.connect(
       file_cleanup, sender=Image, dispatch_uid="gallery.image.file_cleanup"
   )
   

And that's all. As you see in the example above, my sender is Image model, and when it's get deleted, it'll fire file_cleanup function that will take care of cleaning up files.