category active users are stored in a sorted set now

src/categories.js

@@ -138,9 +138,7 @@ var db = require('./database.js'),
 		db.getSortedSetRevRange('categories:' + cid + ':tid', start, stop, callback);
 	};
 
-	Categories.getActiveUsers = function(cid, callback) {
-		db.getSetMembers('cid:' + cid + ':active_users', callback);
-	};
+
 
 	Categories.getAllCategories = function(current_user, callback) {
 		db.getListRange('categories:cid', 0, -1, function(err, cids) {
@@ -268,25 +266,7 @@ var db = require('./database.js'),
 		});
 	};
 
-	Categories.moveActiveUsers = function(tid, oldCid, cid, callback) {
-		function updateUser(uid) {
-			Categories.addActiveUser(cid, uid);
-			Categories.isUserActiveIn(oldCid, uid, function(err, active) {
-
-				if (!err && !active) {
-					Categories.removeActiveUser(oldCid, uid);
-				}
-			});
-		}
 
-		topics.getUids(tid, function(err, uids) {
-			if (!err && uids) {
-				for (var i = 0; i < uids.length; ++i) {
-					updateUser(uids[i]);
-				}
-			}
-		});
-	};
 
 	Categories.getCategoryData = function(cid, callback) {
 		db.exists('category:' + cid, function(err, exists) {
@@ -395,14 +375,38 @@ var db = require('./database.js'),
 		});
 	};
 
-	Categories.addActiveUser = function(cid, uid) {
+	Categories.addActiveUser = function(cid, uid, timestamp) {
 		if(parseInt(uid, 10)) {
-			db.setAdd('cid:' + cid + ':active_users', uid);
+			db.sortedSetAdd('cid:' + cid + ':active_users', timestamp, uid);
 		}
 	};
 
 	Categories.removeActiveUser = function(cid, uid) {
-		db.setRemove('cid:' + cid + ':active_users', uid);
+		db.sortedSetRemove('cid:' + cid + ':active_users', uid);
+	};
+
+	Categories.getActiveUsers = function(cid, callback) {
+		db.getSortedSetRevRange('cid:' + cid + ':active_users', 0, 15, callback);
+	};
+
+	Categories.moveActiveUsers = function(tid, oldCid, cid, callback) {
+		function updateUser(uid) {
+			Categories.addActiveUser(cid, uid);
+			Categories.isUserActiveIn(oldCid, uid, function(err, active) {
+
+				if (!err && !active) {
+					Categories.removeActiveUser(oldCid, uid);
+				}
+			});
+		}
+
+		topics.getUids(tid, function(err, uids) {
+			if (!err && uids) {
+				for (var i = 0; i < uids.length; ++i) {
+					updateUser(uids[i]);
+				}
+			}
+		});
 	};
 
 	Categories.onNewPostMade = function(uid, tid, pid, timestamp) {
@@ -416,13 +420,7 @@ var db = require('./database.js'),
 				db.sortedSetAdd('categories:' + cid + ':tid', timestamp, tid);
 			}
 
-			db.setCount('cid:' + cid + ':active_users', function(err, amount) {
-				if (amount > 15) {
-					db.setRemoveRandom('cid:' + cid + ':active_users');
-				}
-
-				Categories.addActiveUser(cid, uid);
-			});
+			Categories.addActiveUser(cid, uid, timestamp);
 		});
 	}
 

src/upgrade.js

@@ -14,7 +14,7 @@ var db = require('./database'),
 
 Upgrade.check = function(callback) {
 	// IMPORTANT: REMEMBER TO UPDATE VALUE OF latestSchema
-	var	latestSchema = new Date(2014, 0, 4).getTime();
+	var	latestSchema = new Date(2014, 0, 5).getTime();
 
 	db.get('schemaDate', function(err, value) {
 		if (parseInt(value, 10) >= latestSchema) {
@@ -133,7 +133,7 @@ Upgrade.upgrade = function(callback) {
 						db.setObjectField('category:' + cids[cid], 'class', 'col-md-3 col-xs-6');
 					}
 
-					winston.info('[2013/12/31] Added categories.class, categories.link fields');
+					winston.info('[2014/1/3] Added categories.class, categories.link fields');
 					next();
 				});
 			} else {
@@ -156,14 +156,58 @@ Upgrade.upgrade = function(callback) {
 						db.setObjectField('category:' + cids[cid], 'numRecentReplies', '2');
 					}
 
-					winston.info('[2013/12/31] Added categories.numRecentReplies fields');
+					winston.info('[2014/1/4] Added categories.numRecentReplies fields');
 					next();
 				});
 			} else {
-				winston.info('[2014/1/3] categories.numRecentReplies fields skipped');
+				winston.info('[2014/1/4] categories.numRecentReplies fields skipped');
 				next();
 			}
-		}
+		},
+		function(next) {
+			thisSchemaDate = new Date(2014, 0, 5).getTime();
+			if (schemaDate < thisSchemaDate) {
+				updatesMade = true;
+
+				db.getListRange('categories:cid', 0, -1, function(err, cids) {
+					if(err) {
+						return next(err);
+					}
+
+					var timestamp = Date.now();
+
+					function upgradeCategory(cid, next) {
+						db.getSetMembers('cid:' + cid + ':active_users', function(err, uids) {
+							if(err) {
+								return next(err);
+							}
+
+							db.delete('cid:' + cid + ':active_users', function(err) {
+								if(err) {
+									return next(err);
+								}
+
+								for(var i=0; i<uids.length; ++i) {
+									db.sortedSetAdd('cid:' + cid + ':active_users', timestamp, uids[i]);
+								}
+								next();
+							});
+						});
+					}
+
+					async.each(cids, upgradeCategory, function(err) {
+						if(err) {
+							return next(err)
+						}
+						winston.info('[2014/1/5] Upgraded categories active users');
+						next();
+					});
+				});
+			} else {
+				winston.info('[2014/1/5] categories active users skipped');
+				next();
+			}
+		},
 		// Add new schema updates here
 		// IMPORTANT: REMEMBER TO UPDATE VALUE OF latestSchema IN LINE 17!!!
 	], function(err) {