Rename and resize django images on save - django

Question

I'm currently trying to resize and rename my images on save
The problem is that I would like to resize my images in order to make them square without stretching the images, and then change the name of the image to a random number.
Currently I'm doing that inside my model :
user = models.OneToOneField(User, on_delete=models.CASCADE)
bio = models.TextField(null=True, blank=True)
image = models.ImageField(default='/profile_pics/default.jpg',
null=True,
blank=True,
upload_to='profile_pics')
def __str__(self):
return f'{self.user.username} Profile'
def save(self, **kwargs):
super().save()
new_name = random.randint(1, 236325984)
img = Image.open(self.image.path)
if img.height > 300 or img.width > 300:
output_size = (200, 200)
img.thumbnail(output_size)
if img.height < 299 or img.width < 299:
output_size = (200, 200)
img.thumbnail(output_size)
img.save(self.image.path)
I also tried to put in my save function os.rename to rename :
new_name = random.randint(1, 236325984)
name = f'{new_name}.{img.format.lower()}'
os.rename(self.image.path, os.path.join(os.path.dirname(self.image.path), name))
But that's not working and giving me an error : [WinError 32]

Answer 1

import os
from uuid import uuid4
def path_and_rename(path):
def wrapper(instance, filename):
ext = filename.split('.')[-1]
# get filename
if instance.pk:
filename = '{}.{}'.format(instance.pk, ext)
else:
# set filename as random string
filename = '{}.{}'.format(uuid4().hex, ext)
# return the whole path to the file
return os.path.join(path, filename)
return wrapper
and add it to image field
image = models.ImageField(upload_to=path_and_rename('upload/here/'), ...)