more async in categories

src/categories.js

@@ -16,12 +16,19 @@ var	RDB = require('./redis.js'),
 				return;
 			}
 			
-			RDB.smembers('categories:' + category_id + ':tid', function(err, tids) {
-
-				var category_name = categoryData.name;
+			var category_name = categoryData.name,
 				category_slug = categoryData.slug;
 
-				RDB.smembers('cid:' + category_id + ':active_users', function(err, active_users) {
+			function getTopicIds(next) {
+				Categories.getTopicIds(category_id, next);
+			}
+			function getActiveUsers(next) {
+				Categories.getActiveUsers(category_id, next);
+			}
+
+			async.parallel([getTopicIds, getActiveUsers], function(err, results) {
+				var tids = results[0],
+					active_users = results[1];
 
 				var categoryData = {
 					'category_name' : category_name,
@@ -52,9 +59,7 @@ var	RDB = require('./redis.js'),
 				}
 				
 				function getModerators(next) {
-						Categories.getModerators(category_id, function(moderators) {
-							next(null, moderators);
-						});
+					Categories.getModerators(category_id, next);
 				}
 
 				function getActiveUsers(next) {
@@ -81,9 +86,17 @@ var	RDB = require('./redis.js'),
 						callback(categoryData);
 					});
 				}
+
 			});
 		});
-		});
+	}
+
+	Categories.getTopicIds = function(cid, callback) {
+		RDB.smembers('categories:' + cid + ':tid', callback);
+	}
+
+	Categories.getActiveUsers = function(cid, callback) {
+		RDB.smembers('cid:' + cid + ':active_users', callback);
 	}
 
 	// not the permanent location for this function
@@ -204,16 +217,20 @@ var	RDB = require('./redis.js'),
 		});
 	}
 
-	
-
 	Categories.getModerators = function(cid, callback) {
 		RDB.smembers('cid:' + cid + ':moderators', function(err, mods) {
-			if (mods.length === 0)
-				return callback([]);
-
+			if(!err) {
+				if(mods && mods.length) {
 					user.getMultipleUserFields(mods, ['username'], function(moderators) {
-				callback(moderators);
+						callback(null, moderators);
 					});
+				} else {
+					callback(null, []);
+				}
+			} else {
+				callback(err, null);
+			}
+
 		});
 	}