toJson method
Implementation
@override
Object toJson() => {
if (uri != null) 'uri': uri,
if (title != null) 'title': title,
if (text != null) 'text': text,
if (placeId != null) 'placeId': placeId,
if (placeAnswerSources != null)
'placeAnswerSources': placeAnswerSources!.toJson(),
};