fix decr/incrObjectField if key in array doesn't exist create it

src/database/mongo/hash.js

@@ -289,7 +289,10 @@ module.exports = function (db, module) {
 
 		if (Array.isArray(key)) {
 			var bulk = db.collection('objects').initializeUnorderedBulkOp();
-			bulk.find({ _key: { $in: key } }).upsert().update({ $inc: data });
+			key.forEach(function (key) {
+				bulk.find({ _key: key }).upsert().update({ $inc: data });
+			});
+
 			async.waterfall([
 				function (next) {
 					bulk.execute(function (err) {

test/database/hash.js

@@ -408,10 +408,11 @@ describe('Hash methods', function () {
 		});
 
 		it('should decrement multiple objects field by 1 and return an array of new values', function (done) {
-			db.decrObjectField(['testObject13', 'testObject14'], 'age', function (err, data) {
+			db.decrObjectField(['testObject13', 'testObject14', 'decrTestObject'], 'age', function (err, data) {
 				assert.ifError(err);
 				assert.equal(data[0], 97);
 				assert.equal(data[1], -1);
+				assert.equal(data[2], -1);
 				done();
 			});
 		});