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refactoring scoring.js

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This commit is contained in:
Sacha Greif 2013-04-26 20:05:52 +09:00
parent f14627bfc2
commit e8c726bd9c
1 changed files with 5 additions and 8 deletions
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13
server/scoring.js
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@ -12,6 +12,9 @@ updateScore = function (collection, id, forceUpdate) {
var n = 30;
// x = score increase amount of a single vote after n days (for n=100, x=0.000040295)
var x = 1/Math.pow(n*24+2,1.3);
// time decay factor
var f = 1.3;
var object = collection.findOne(id);
// use submitted timestamp if available, else (for pending posts) calculate score using createdAt
@ -27,20 +30,14 @@ updateScore = function (collection, id, forceUpdate) {
var ageInHours = (new Date().getTime() - age) / (60 * 60 * 1000);
// HN algorithm
var newScore = baseScore / Math.pow(ageInHours + 2, 1.3);
// console.log('newScore: '+newScore);
var newScore = baseScore / Math.pow(ageInHours + 2, f);
// Note: before the first time updateScore runs on a new item, its score will be at 0
var scoreDiff = Math.abs(object.score - newScore);
// console.log('updating score | scoreDiff:'+scoreDiff);
collection.update(id, {$set: {inactive: false}});
// only update database if difference is larger than x to avoid unnecessary updates
if (forceUpdate || scoreDiff > x){
// console.log('updating: '+object.headline)
collection.update(id, {$set: {score: newScore}});
collection.update(id, {$set: {score: newScore, inactive: false}});
return 1;
}else if(ageInHours > n*24){
// only set a post as inactive if it's older than n days