models.py

import random
import os
from django.db import models

# Create your models here.
def get_filename_ext(filepath):
    base_name = os.path.basename(filepath)
    name, ext = os.path.splitext(base_name)
    return name, ext


def upload_image_path(instance, filename):
    new_filename = random.randint(1,3987823423)
    name, ext = get_filename_ext(filename)
    final_filename = '{new_filename}{ext}'.format(new_filename=new_filename, ext=ext)
    return"products/{new_filename}/{final_filename}".format(
           new_filename=new_filename,
           final_filename=final_filename
           )    
class Product(models.Model):
    title       = models.CharField(max_length=120)
    description = models.TextField()
    price       = models.DecimalField(decimal_places=2,max_digits=20,default=39.99)
    image       = models.ImageField(upload_to=upload_image_path,null=True,blank=True)



    def __str__(self):
        return self.title

    def __unicode__(self):
        return self.title