toJson method
Implementation
Map<String, dynamic> toJson() => {
'id': id,
'name': name,
'variants': variants.map((v) => v.toJson()).toList(),
if (startDate != null) 'startDate': startDate!.toIso8601String(),
if (endDate != null) 'endDate': endDate!.toIso8601String(),
'enabled': enabled,
};