在Django中未调用自定义存储delete（）方法

Question

I have a field that inherits from ImageField with a custom storage like this:

image = PicasaImageField(upload_to=get_upload_to, blank=True, storage=pwcs())

When deleting an object with this field (using object.delete(), NOT bulk), the delete method of the custom storage doesn't get called. Trying to debug, I couldn't find where Django is going through the fields of an object to delete the file or whatever is behind in the actual storage. Or should I delete the file manually / in a hook / write a custom delete() method into my end model that will call the behind-the-stage delete() on the actual object? I failed to find how this is handled with the standard ImageFile + default filesystem, but would assume regular files would be deleted. Or am I getting it wrong?

Thanks for any insights.

Igor

Answer 1

From the Django 1.3 release notes :

when a model is deleted the FileField's delete() method won't be called. If you need cleanup of orphaned files, you'll need to handle it yourself

As you suggested you could handle this in a custom delete method:

def delete(self, *args, **kwargs):
    image.delete(save=False)
    super(Foo, self).delete(*args, **kwargs)

or use a receiver function which will be called even when object.delete() is not called:

@receiver(post_delete, sender=Foo, weak=False)
def delete_image_on_file(sender, instance, **kwargs):
    image.delete(save=False)