toJSON method

Implementation

Map<String, dynamic>  toJSON()=>{
//    'id': id, //generated by firebase
  'ownerId': ownerId,
  'profileId': profileId,
  'profileName': profileName,
  'profileImgUrl': profileImgUrl,
  'message': message,
  'activityReferenceId': activityReferenceId,
  'activityFeedType': activityFeedType?.name ?? "",
  'mediaUrl': mediaUrl,
  'createdTime': createdTime,
  'unread': unread,
};