class BossGT8(models.Model):
    name = models.CharField(max_length=30)
    artist = models.CharField(max_length=40)
    created = models.DateTimeField(auto_now_add=True)
    uploader = models.CharField(max_length=30)
    download = models.IntegerField(default=0)
    filename = models.FileField(upload_to='patch_files/boss_gt8')
    filesize = models.IntegerField(default=0)
    description = models.TextField(max_length=800, blank=True, verbose_name='Description')
    rating = models.IntegerField(default=0)
    isshow = models.BooleanField(default=True)

#in models.py

from django.db import models
from django.db.models.signals import post_delete
import os

class BossGT8(models.Model):
name = models.CharField(max_length=30)
created = models.DateTimeField(auto_now_add=True))
filename = models.FileField(upload_to='patch_files')

def delete_file(sender, **kwargs):
patch = kwargs['instance']
os.remove(patch.filename.path)

post_delete.connect(delete_file, sender=BossGT8)