safe file directly to avoid django renaming

oxdata/poster/models.py

@@ -75,7 +75,10 @@ class PosterCache(models.Model):
             name = hashlib.sha1(url).hexdigest()
             try:
                 data = ox.net.readUrl(url)
-                self.image.save(name, ContentFile(data))
+                self.image.name = poster.models.poster_path(self.url, 'image.jpg')
+                with open(self.image.path, 'w') as f:
+                    f.write(data)
+                self.save()
             except ox.net.urllib2.HTTPError, e:
                 #import traceback
                 #print traceback.print_exc()