feat: allow exists methods to work with arrays and single id

src/categories/index.js

@@ -23,11 +23,10 @@ require('./update')(Categories);
 require('./watch')(Categories);
 require('./search')(Categories);
 
-Categories.exists = async function (cid) {
-	if (Array.isArray(cid)) {
-		return await db.exists(cid.map(cid => `category:${cid}`));
-	}
-	return await db.exists(`category:${cid}`);
+Categories.exists = async function (cids) {
+	return await db.exists(
+		Array.isArray(cids) ? cids.map(cid => `category:${cid}`) : `category:${cids}`
+	);
 };
 
 Categories.getCategoryById = async function (data) {

src/posts/index.js

@@ -28,10 +28,9 @@ require('./diffs')(Posts);
 require('./uploads')(Posts);
 
 Posts.exists = async function (pids) {
-	const isArray = Array.isArray(pids);
-	pids = isArray ? pids : [pids];
-	const exists = await db.exists(pids.map(pid => `post:${pid}`));
-	return isArray ? exists : exists[0];
+	return await db.exists(
+		Array.isArray(pids) ? pids.map(pid => `post:${pid}`) : `post:${pids}`
+	);
 };
 
 Posts.getPidsFromSet = async function (set, start, stop, reverse) {

src/topics/index.js

@@ -35,8 +35,10 @@ require('./bookmarks')(Topics);
 require('./merge')(Topics);
 Topics.events = require('./events');
 
-Topics.exists = async function (tid) {
-	return await db.exists(`topic:${tid}`);
+Topics.exists = async function (tids) {
+	return await db.exists(
+		Array.isArray(tids) ? tids.map(tid => `topic:${tid}`) : `topic:${tids}`
+	);
 };
 
 Topics.getTopicsFromSet = async function (set, uid, start, stop) {

src/user/index.js

@@ -40,8 +40,12 @@ require('./online')(User);
 require('./blocks')(User);
 require('./uploads')(User);
 
-User.exists = async function (uid) {
-	return await db.isSortedSetMember('users:joindate', uid);
+User.exists = async function (uids) {
+	return await (
+		Array.isArray(uids) ?
+			db.isSortedSetMembers('users:joindate', uids) :
+			db.isSortedSetMember('users:joindate', uids)
+	);
 };
 
 User.existsBySlug = async function (userslug) {