fixed read status in categories

src/categories.js

@@ -128,7 +128,7 @@ var	RDB = require('./redis.js'),
 			}
 
 			function hasReadTopic(next) {
-				topics.hasReadTopics([topicData.tid], current_user, function(hasRead) {
+				topics.hasReadTopic(topicData.tid, current_user, function(hasRead) {
 					next(null, hasRead);
 				});
 			}

src/topics.js

@@ -245,6 +245,18 @@ marked.setOptions({
 		});
 	}
 
+	Topics.hasReadTopic = function(tid, uid, callback) {
+		RDB.sismember(schema.topics(tid).read_by_uid, uid, function(err, hasRead) {
+			if(err === null) {
+				callback(hasRead);
+			}
+			else {
+				console.log(err);
+				callback(false);
+			}
+		});	
+	}
+	
 	Topics.getTeasers = function(tids, callback) {
 		var	requests = [];
 		if (Array.isArray(tids)) {