我经过大量搜索和发现此旧文档票证有很好的解释。

I figured it out after a lot of searching and finding this old documentation ticket that has a good explanation.

class UploadModel(models.Model):
    image = models.ImageField(upload_to='uploads')

    def save(self, *args, **kwargs):

        # Call standard save
        super(UploadModel, self).save(*args, **kwargs)

        if 'uploads' in self.image.path:

            initial_path = self.image.path

            # New path in the form eg '/images/uploadmodel/1/image.jpg'
            new_name = '/'.join(['images', self._meta.model_name, str(self.id), 
                path.basename(initial_path)])
            new_path = os.path.join(settings.MEDIA_ROOT, 'images', 
            self._meta.model_name, self.pk, os.path.basename(initial_path))

            # Create dir if necessary and move file
            if not os.path.exists(os.path.dirname(new_path)):
                makedirs(os.path.dirname(new_path))

            os.rename(initial_path, new_path)

            # Update the image_file field
            self.image_file.name = new_name

            # Save changes
            super(UploadModel, self).save(*args, **kwargs)

现在我读了为此的文档，它看起来很明显：)但我确实认为可以使说明更具描述性。希望这可以节省一些时间！

Now I read the docs for this it looks totally obvious :) but I do think the explanation could be made more descriptive. Hopefully this will save someone some time!