def post(self):
album_key = ndb.Key(urlsafe=self.request.get('key'))
upload_files = self.get_uploads() # 'file' is file upload field in the form
blob_info = upload_files[0]
photo = Image(parent=album_key, image_blob=blob_info.key(), index=1)
photo.populate(serving_url=images.get_serving_url(blob_info.key()))
photo.put()
self.redirect('/add-album?key=%s' % album_key.urlsafe())
