added isOrphan method, #6455

src/posts/uploads.js

@@ -49,6 +49,13 @@ module.exports = function (Posts) {
 		db.getSortedSetRange('post:' + pid + ':uploads', 0, -1, callback);
 	};
 
+	Posts.uploads.isOrphan = function (filePath, callback) {
+		// Returns bool indicating whether a file is still CURRENTLY included in any posts
+		db.sortedSetCard('upload:' + md5(filePath) + ':pids', function (err, length) {
+			callback(err, length === 0);
+		});
+	};
+
 	Posts.uploads.associate = function (pid, filePaths, callback) {
 		// Adds an upload to a post's sorted set of uploads
 		const now = Date.now();

test/posts.js

@@ -941,6 +941,24 @@ describe('Post\'s', function () {
 			});
 		});
 
+		describe('.isOrphan()', function () {
+			it('should return false if upload is not an orphan', function (done) {
+				posts.uploads.isOrphan('abracadabra.png', function (err, isOrphan) {
+					assert.ifError(err);
+					assert.equal(false, isOrphan);
+					done();
+				});
+			});
+
+			it('should return true if upload is an orphan', function (done) {
+				posts.uploads.isOrphan('shazam.jpg', function (err, isOrphan) {
+					assert.ifError(err);
+					assert.equal(true, isOrphan);
+					done();
+				});
+			});
+		});
+
 		describe('.associate()', function () {
 			it('should add an image to the post\'s maintained list of uploads', function (done) {
 				async.waterfall([