How to change file size before saving in model?

Question

Django

My code:

class ...(models.Model):
 ...
  def save(self, *args, **kwargs):
    super(Photo, self).save(*args, **kwargs)

    filepath = self.image.path

    width = self.image.width
    height = self.image.height

    if height < width:
                	new_width = int(round(297*90/25))
                	new_height = int(round(210*90/25))
                else:
                	new_height = int(round(297*90/25))
                	new_width = int(round(210*90/25))

                image = Image.open(filepath)
    image = image.resize((new_width,new_height), Image.ANTIALIAS)
    image.save(filepath, format='JPEG', quality=90)

In general, it works, but I would like to change the size and format before saving, and not after.
I tried to override the save_model method in the admin. There, the file has the TemporaryUploadFile type, how to change its size and type, it was not possible to google it.

Answer 1

If the action is frequent, I would look towards the fields for the models from django-imagemagick and not fence the bikes