toJson method
Implementation
Map<String, dynamic> toJson() => {
if (jointVip != null) 'jointVip': jointVip,
if (color != null) 'color': color,
if (underline != null) 'underline': underline,
if (metal != null) 'metal': metal,
if (autoCheckin != null) 'autoCheckin': autoCheckin,
if (bold != null) 'bold': bold,
if (checkinCard != null) 'checkinCard': checkinCard,
};