toJson method Null safety
Implementation
Map<String, dynamic> toJson() => {
"items": items == null
? null
: List<dynamic>.from(items!.map((x) => x.toJson())),
"summary": summary == null
? null
: List<dynamic>.from(summary!.map((x) => x.toJson())),
"address": address == null ? null : address!.toJson(),
"paymentOption": paymentOption == null ? null : paymentOption!.toJson(),
"total": total,
"configDeliveryPeriod": configDeliveryPeriod == null
? null
: configDeliveryPeriod!.toJson(),
};