getUpvoters works with array

public/src/client/topic/postTools.js

@@ -39,15 +39,15 @@ define('forum/topic/postTools', ['composer', 'share', 'navigator'], function(com
 
 	function addVoteHandler() {
 		$('#post-container').on('mouseenter', '.post-row .votes', function() {
-			loadDataAndCreateTooltip($(this), 'posts.getUpvoters');
+			loadDataAndCreateTooltip($(this));
 		});
 	}
 
-	function loadDataAndCreateTooltip(el, method) {
+	function loadDataAndCreateTooltip(el) {
 		var pid = el.parents('.post-row').attr('data-pid');
-		socket.emit(method, pid, function(err, data) {
+		socket.emit('posts.getUpvoters', [pid], function(err, data) {
-			if (!err) {
+			if (!err && data.length) {
-				createTooltip(el, data);
+				createTooltip(el, data[0]);
 			}
 		});
 	}

src/socket.io/posts.js

@@ -339,8 +339,11 @@ SocketPosts.getPrivileges = function(socket, pids, callback) {
 	});
 };
 
-SocketPosts.getUpvoters = function(socket, pid, callback) {
+SocketPosts.getUpvoters = function(socket, pids, callback) {
-	favourites.getUpvotedUidsByPids([pid], function(err, data) {
+	if (!Array.isArray(pids)) {
+		return callback(new Error('[[error:invalid-data]]'));
+	}
+	favourites.getUpvotedUidsByPids(pids, function(err, data) {
 		if (err || !Array.isArray(data) || !data.length) {
 			return callback(err, []);
 		}