#6986

src/database/mongo/main.js

@@ -25,9 +25,24 @@ module.exports = function (db, module) {
 		if (!key) {
 			return callback();
 		}
-		db.collection('objects').findOne({ _key: key }, function (err, item) {
-			callback(err, item !== undefined && item !== null);
-		});
+		if (Array.isArray(key)) {
+			db.collection('objects').find({ _key: { $in: key } }).toArray(function (err, data) {
+				if (err) {
+					return callback(err);
+				}
+
+				var map = {};
+				data.forEach(function (item) {
+					map[item._key] = true;
+				});
+
+				callback(null, key.map(key => !!map[key]));
+			});
+		} else {
+			db.collection('objects').findOne({ _key: key }, function (err, item) {
+				callback(err, item !== undefined && item !== null);
+			});
+		}
 	};
 
 	module.delete = function (key, callback) {

src/database/postgres/main.js

@@ -30,21 +30,42 @@ module.exports = function (db, module) {
 			return callback();
 		}
 
-		query({
-			name: 'exists',
-			text: `
-SELECT EXISTS(SELECT *
-                FROM "legacy_object_live"
-               WHERE "_key" = $1::TEXT
-               LIMIT 1) e`,
-			values: [key],
-		}, function (err, res) {
-			if (err) {
-				return callback(err);
-			}
+		if (Array.isArray(key)) {
+			query({
+				name: 'exists',
+				text: `
+				SELECT o."_key" k
+  				FROM "legacy_object_live" o
+ 				WHERE o."_key" = ANY($1::TEXT[])`,
+				values: [key],
+			}, function (err, res) {
+				if (err) {
+					return callback(err);
+				}
 
-			callback(null, res.rows[0].e);
-		});
+				callback(null, key.map(function (k) {
+					return res.rows.some(function (r) {
+						return r.k === k;
+					});
+				}));
+			});
+		} else {
+			query({
+				name: 'exists',
+				text: `
+	SELECT EXISTS(SELECT *
+					FROM "legacy_object_live"
+				   WHERE "_key" = $1::TEXT
+				   LIMIT 1) e`,
+				values: [key],
+			}, function (err, res) {
+				if (err) {
+					return callback(err);
+				}
+
+				callback(null, res.rows[0].e);
+			});
+		}
 	};
 
 	module.delete = function (key, callback) {

src/database/redis/main.js

@@ -1,6 +1,8 @@
 'use strict';
 
 module.exports = function (redisClient, module) {
+	var helpers = module.helpers.redis;
+
 	module.flushdb = function (callback) {
 		redisClient.send_command('flushdb', [], function (err) {
 			if (typeof callback === 'function') {
@@ -20,9 +22,15 @@ module.exports = function (redisClient, module) {
 	};
 
 	module.exists = function (key, callback) {
-		redisClient.exists(key, function (err, exists) {
-			callback(err, exists === 1);
-		});
+		if (Array.isArray(key)) {
+			helpers.multiKeys(redisClient, 'exists', key, function (err, data) {
+				callback(err, data && data.map(exists => exists === 1));
+			});
+		} else {
+			redisClient.exists(key, function (err, exists) {
+				callback(err, exists === 1);
+			});
+		}
 	};
 
 	module.delete = function (key, callback) {

test/database/keys.js

@@ -53,6 +53,14 @@ describe('Key methods', function () {
 		});
 	});
 
+	it('should work for an array of keys', function (done) {
+		db.exists(['testKey', 'doesnotexist'], function (err, exists) {
+			assert.ifError(err);
+			assert.deepStrictEqual(exists, [true, false]);
+			done();
+		});
+	});
+
 	it('should delete a key without error', function (done) {
 		db.delete('testKey', function (err) {
 			assert.ifError(err);