parse.com - iOS + Parse Cloud Code - updating a specific user (not logged in user) -

i trying update user (which not current user). figured have use cloud code make update.

i have created cloud function below update selected user. trying add meetingid's array property belongs user class.

cloud code:

parse.cloud.define('updateuser', function(request, response) {                 var userid = request.params.userid,                meetingid = request.params.meetingid;                 var user = parse.object.extend('_user'),                user = new user({ objectid: userid });                 user.addunique("meetingsarray", meetingid)                  user.save(null, {usermasterkey:true}).then(function(user) {                                 response.success(user);                                 }, function(error) {                                 response.error(error)                                 });                 }); 

objective-c //meetingid - obtained meeting object.

  [pfcloud callfunctioninbackground:@"updateuser" withparameters:@{@"objectid":user.objectid, @"meetingsarray":meetingid} block:^(nsstring *result, nserror *error)      {          if (!error) {              nslog(@"%@",result);          }else if(error){              nslog(@"%@", error);          }      }]; 

when run app - following error code:

error domain=parse code=141 "the operation couldn’t completed. (parse error 141.)" userinfo=0x1704f2780 {code=141, temporary=0, error={"code":201,"message":"missing user password"}, originalerror=error domain=nsurlerrordomain code=-1011 "the operation couldn’t completed. (nsurlerrordomain error -1011.)"} 

i'm new cloud code - want update array belongs selected user , add meetingid it. appreciate it.

there few problems code prevent working:

1. the cloud code expects meeting id parameter named @"meetingid", change parameters passed @{@"objectid":user.objectid, @"meetingid":meetingid}

2. use parse.user, not '_user' extend user.

3. get - don't build - user being updated

summing up...

parse.cloud.define('updateuser', function(request, response) {     var userid = request.params.userid;     var meetingid = request.params.meetingid;      var query = new parse.query(parse.user);     query.get(userid).then(function(user) {         user.addunique("meetingsarray", meetingid);         return user.save(null, {usemasterkey:true});     }).then(function(user) {         response.success(user);     }, function(error) {         response.error(error);     }); });