def METHOD_NAME(self):
    # overwrite BaseChart name function to allow unique choropleths on
    # value x
    if self.chart_type is not None:
        return (
            f"{self.x}_{self.aggregate_fn}_{self.chart_type}_{self.title}"
        )
    else:
        return f"{self.x}_{self.aggregate_fn}_chart_{self.title}"