Able to choose whether to update multiple docs or just one

lib/datastore.js

@@ -186,16 +186,23 @@ Datastore.prototype.persistWholeDatabase = function (data, cb) {
  * For now, very naive implementation (recalculating the whole database)
  * @param {Object} query
  * @param {Object} newDoc Will replace the former docs
+ * @param {Object} options Optional options
+ *                 options.multi If true, can update multiple documents (defaults to false)
  * @param {Function} cb Optional callback, signature: err, numReplaced
  */
-Datastore.prototype.update = function (query, newDoc, cb) {
+Datastore.prototype.update = function (query, newDoc, options, cb) {
-  var callback = cb || function () {}
+  var callback
     , self = this
     , numReplaced = 0
+    , multi
     , newData = [];
 
+  if (typeof options === 'function') { cb = options; options = {}; }
+  callback = cb || function () {};
+  multi = options.multi !== undefined ? options.multi : false;
+
   self.data.forEach(function (d) {
-    if (Datastore.match(d, query)) {
+    if (Datastore.match(d, query) && (multi || numReplaced === 0)) {
       numReplaced += 1;
       newData.push(newDoc);
     } else {
@@ -217,7 +224,7 @@ var d = new Datastore('workspace/test.db');
 d.loadDatabase(function (err) {
   console.log(d.data);
 
-  d.update({ yahoo: 'dailymotion' }, {yahoo: 'great' }, function (err, n) {
+  d.update({ yahoo: 'great' }, {yahoo: 'great2' }, { multi: false }, function (err, n) {
     console.log("--------------");
     console.log(err);
     console.log(n);