toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (dateFormat != null) 'dateFormat': dateFormat!,
if (dateFormatType != null) 'dateFormatType': dateFormatType!,
if (maxValue != null) 'maxValue': maxValue!,
if (minValue != null) 'minValue': minValue!,
};