def get_prep_value(self, value):
if value is None:<EOL><INDENT>return None<EOL><DEDENT>else:<EOL><INDENT>return encoding.smart_text(<EOL>base64.b64encode(jsonpickle.encode(value).encode()))<EOL><DEDENT>
Overrides ``models.Field`` method. This is used to convert
        the value from an instances of this class to bytes that can be
        inserted into the database.