toJson method
Implementation
Map<String, dynamic> toJson() {
final json = <String, dynamic>{};
json['cost'] = cost;
json['cost_name'] = costName;
json['created_at'] = createdAt.toIso8601String();
if (id != null) {
json['id'] = id;
}
json['updated_at'] = updatedAt.toIso8601String();
return json;
}