toMap method
Conversion to Map
Implementation
Map toMap() {
Map map = Map();
if (id != null) map[MAP_ID] = id;
if (sentAt != null) map[MAP_SENT_AT] = sentAt;
if (status != null) map[MAP_STATUS] = status;
if (sendingId != null) map[MAP_SENDING_ID] = sendingId;
if (message != null) map[MAP_MESSAGE] = message;
map[MAP_READ] = read;
return map;
}