toMap method 
    
    
    
  Implementation
  Map<String, dynamic> toMap() {
  Map<String, dynamic> map = {};
  if (joined != null) {
    map['joined'] = joined;
  }
  if (members != null) {
    map['members'] = members;
  }
  if (unreads != null) {
    map['unreads'] = unreads;
  }
  if (unreadsFrom != null) {
    map['unreadsFrom'] = unreadsFrom!.toIso8601String();
  }
  if (msgs != null) {
    map['msgs'] = msgs;
  }
  if (latest != null) {
    map['latest'] = latest!.toIso8601String();
  }
  if (userMentions != null) {
    map['userMentions'] = userMentions;
  }
  if (success != null) {
    map['success'] = success;
  }
  return map;
}