How to implement relative leaderboard

Question

Hey guys,

I want to inplement a relative leaderboard, which means treat current user as the middle point and find 5 users have higher ranking than me and 5 users have lower ranking to me.

I didn't find method that allow me to do that directly, nor the method can use to retireve user based on his/her ranking.

I don't want to implement this in a way that get top 20 first and then get sublist of the top 20. This is not scale and will be very slow for the user who has a low ranking. Any one has any idea about how to achieve relative leaderboard?

Thanks in advance.

Answer 1

hi tianyi ,

 We have method to find user ranking directly , you can find code snippet here

Comments

What I am looking for is the other way around. By giving a ranking, find the user who has this ranking. Is there a way to do this?

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Hi, Yes, I understand your use case, You can achieve this by using our leaderboard service. Let say if you know the current user ranking by using our method ( http://api.shephertz.com/app42-docs/leaderboard-service/#get_user_ranking )and based on this you can find the highest rankers and lower rankers then you by using our offset supported methods something like this.

scoreBoardService.setPageOffset(45);// Suppose your rank is 50 .So you must set your offset value is 45 .
Game getTopRanker = scoreBoardService.getTopNRankers(gameName, 5);

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Thanks Samita!
When I call getTopNRankers and game.getScoreList().get(i).getRank(), I can get other data, but for rank, it always return null. I also tried getTopNRankings, and got the same result. Any hint for this?

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Hi,
1) Rank is only coming in getUserRanking method.
2) getTopNRankers or getTopNRankings is coming in rank order.If you want to maintain the rank of users , you add offset no. and current index no. then you get the exact rank of users also.
E.g : Your friend index is 1 then rank is 45(offset)+ 1 = 46 (Friend Rank)

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Is it possible that this setPageOffset() function isn't working correctly in the ActionScript API?  I can seem to get anything but the top of the leaderboard.  My code:

var scoreBoardService:ScoreBoardService = serviceAPI.buildScoreBoardService();
scoreBoardService.setPageOffset( 6 );
scoreBoardService.getTopNRankers( "highscores", 6, response );

Is there something else I need to do?  I tried calling setPageMaxRecords( 1 ), but that didn't seem to make a difference.

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Hi Shane,
Kindly find the latest sdk of ActionScript API and let me know if it helps.
https://github.com/shephertz/App42-ActionScript-SDK
Thanks.

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Yes, thank you for making version 2.4.1, that has fixed it!

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How do we know which are the "offset supported methods"?
And for example if I use SetPageMaxRecords(N) and then getTopNRankings, "game", M), will it return N or M or max(N,M), or min(N,M) results?

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Hi Jorge Galvão ,
1)These are list of supported methods in which we support offset value and we also mention in our documents as soon as possible :-
Get Top N Rankings
Get Top N Rankers
Get Top N Rankers By Date
Get Top N Rankers By Group
Get Top N Rankers From Facebook
Get Top N Rankers From Facebook With Date Range
Get Top N Target Rankers
2)SetPageMaxRecords(N) and then getTopNRankings("game", M), It will always return M because M is passed from the method.