optimize getPostSummaryByPids

src/database/mongo/sorted.js

@@ -1,5 +1,7 @@
 "use strict";
 
+var async = require('async');
+
 module.exports = function(db, module) {
 	var helpers = module.helpers.mongo;
 
@@ -119,6 +121,17 @@ module.exports = function(db, module) {
 		});
 	}
 
+	module.sortedSetsRanks = function(keys, values, callback) {
+		var data = new Array(values.length);
+		for (var i=0; i<values.length; ++i) {
+			data[i] = {key: keys[i], value: values[i]};
+		}
+
+		async.map(data, function(item, next) {
+			getSortedSetRank(module.getSortedSetRange, item.key, item.value, next);
+		}, callback);
+	};
+
 	module.sortedSetScore = function(key, value, callback) {
 		value = helpers.valueToString(value);
 		db.collection('objects').findOne({_key:key, value: value}, {fields:{score:1}}, function(err, result) {

src/database/redis/sorted.js

@@ -54,6 +54,14 @@ module.exports = function(redisClient, module) {
 		redisClient.zrank(key, value, callback);
 	};
 
+	module.sortedSetsRanks = function(keys, values, callback) {
+		var multi = redisClient.multi();
+		for(var i=0; i<values.length; ++i) {
+			multi.zrank(keys[i], values[i]);
+		}
+		multi.exec(callback);
+	};
+
 	module.sortedSetRevRank = function(key, value, callback) {
 		redisClient.zrevrank(key, value, callback);
 	};