toJson method
Implementation
Map<String, dynamic> toJson() {
final Map<String, dynamic> json = {
'time': timestamp,
};
if (event != null) json['event'] = event;
if (distance != null) json['distance'] = distance;
if (duration != null) json['duration'] = duration;
if (key != null) json['key'] = key;
if (position != null) json['position'] = position!.toJson();
if (target != null) json['target'] = target;
return json;
}