KarmaDecimal

type KarmaDecimal struct {
    decimal.Decimal
}

// Scan implements the sql.Scanner interface for database deserialization.
func (d *KarmaDecimal) Scan(value interface{}) error {
    // first try to see if the data is stored in database as a Numeric datatype
    switch v := value.(type) {

    case float32:
        old_d := decimal.NewFromFloat32(v)
        *d = KarmaDecimal{old_d}
        return nil
    case sql.NullFloat64:
        old_d := decimal.NewFromFloat(v.Float64)
        *d = KarmaDecimal{old_d}
        return nil
    default:
        return d.Decimal.Scan(value)
    }
}