django-upload-id.py

import os
from django.db import models

def get_image_path(instance, filename):
    return os.path.join('photos', instance.id, filename)

class Photo(models.Model):
    image = models.ImageField(upload_to=get_image_path)


if request.method == 'POST':
    form = PhotoForm(request.POST, request.FILES)
    if form.is_valid():
        photo = Photo.objects.create()
        image_file = request.FILES['image']
        photo.image.save(image_file.name, image_file)