class CompressedTextField(models.TextField): """ model Fields for storing text in a compressed format (bz2 by default) """ __metaclass__ = models.SubfieldBase def to_python(self, value): if not value: return value try: return value.decode('base64').decode('bz2').decode('utf-8') except Exception: return value def get_prep_value(self, value): if not value: return value try: value.decode('base64') return value except Exception: try: tmp = value.encode('utf-8').encode('bz2').encode('base64') except Exception: return value else: if len(tmp) > len(value): return value return tmp