change to .exists

src/categories/index.js

@@ -21,7 +21,7 @@ require('./recentreplies')(Categories);
 require('./update')(Categories);
 
 Categories.exists = function (cid, callback) {
-	db.isSortedSetMember('categories:cid', cid, callback);
+	db.exists('category:' + cid, callback);
 };
 
 Categories.getCategoryById = function (data, callback) {

src/posts/index.js

@@ -30,7 +30,7 @@ require('./diffs')(Posts);
 require('./uploads')(Posts);
 
 Posts.exists = function (pid, callback) {
-	db.isSortedSetMember('posts:pid', pid, callback);
+	db.exists('post:' + pid, callback);
 };
 
 Posts.getPidsFromSet = function (set, start, stop, reverse, callback) {

src/topics/index.js

@@ -34,7 +34,7 @@ require('./bookmarks')(Topics);
 require('./merge')(Topics);
 
 Topics.exists = function (tid, callback) {
-	db.isSortedSetMember('topics:tid', tid, callback);
+	db.exists('topic:' + tid, callback);
 };
 
 Topics.getTopicsFromSet = function (set, uid, start, stop, callback) {

src/user/index.js

@@ -112,7 +112,7 @@ User.getStatus = function (userData) {
 };
 
 User.exists = function (uid, callback) {
-	db.isSortedSetMember('users:joindate', uid, callback);
+	db.exists('user:' + uid, callback);
 };
 
 User.existsBySlug = function (userslug, callback) {