toJson method
Implementation
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = <String, dynamic>{};
data['title'] = title;
data['title-id'] = titleId;
data['main-type'] = mainType;
data['lang'] = lang;
if (collection != null) {
data['collection'] = collection!.map((v) => v.toJson()).toList();
}
return data;
}