Handle save method in model for image

I have the following Image model

class Image(models.Model):
    id = models.UUIDField(
    image = models.ImageField(upload_to=image_path, max_length=300,blank=True)
    thumbnail=models.ImageField(upload_to=image_thumb_path,max_length=300, blank=True)

And I need to implement the following behavior for this model:

  1. When loading an image field, create a thumbnail and save it in the thumbnail field.
  2. When deleting the image field, also delete the thumbnail.
  3. When deleting a thumbnail… just delete the thumbnail

To implement this I override the save method like here

def save(self, *args, **kwargs) -> None:
    THUMBNAIL_SIZE = (400, 400)
    if self.image:
        image = PILImage.open(self.image)
        image = image.convert("RGB")
        image.thumbnail(THUMBNAIL_SIZE, PILImage.ANTIALIAS)
        temp_thumb = BytesIO()
        image.save(temp_thumb, "JPEG")
    elif self.thumbnail and not self.image:
    return super().save( *args, **kwargs)

As you can see it matches the first two conditions but I don’t know how to implement the 3rd condition because every time I delete the thumbnail it creates it again because 1st condition. What wrong here? It seems to be impossible to implement because the conditions for 1 and 3 tasks are the same

I agree that this would be the wrong place to do this because you don’t have sufficient context at this stage of the process to determine what your actions should be.

This decision doesn’t seem to me to be a characteristic of the model, but of the operation being performed on that instance.

I would think that that type of determination is more appropriately performed in (or called from) the views where these options are available.