Merge pull request #25 from pollensoft/master

Default to the original Backbone sync method when no localStorage is available

backbone.localStorage.js

@@ -82,6 +82,7 @@ _.extend(Backbone.LocalStorage.prototype, {
 // *localStorage* property, which should be an instance of `Store`.
 // window.Store.sync and Backbone.localSync is deprectated, use Backbone.LocalStorage.sync instead
 Backbone.LocalStorage.sync = window.Store.sync = Backbone.localSync = function(method, model, options, error) {
+  var store = model.localStorage || model.collection.localStorage;
 
   // Backwards compatibility with Backbone <= 0.3.3
   if (typeof options == 'function') {
@@ -92,7 +93,6 @@ Backbone.LocalStorage.sync = window.Store.sync = Backbone.localSync = function(m
   }
 
   var resp;
-  var store = model.localStorage || model.collection.localStorage;
 
   switch (method) {
     case "read":    resp = model.id != undefined ? store.find(model) : store.findAll(); break;
@@ -108,9 +108,21 @@ Backbone.LocalStorage.sync = window.Store.sync = Backbone.localSync = function(m
   }
 };
 
-// Override 'Backbone.sync' to default to localSync, 
-// the original 'Backbone.sync' is still available in 'Backbone.ajaxSync'
 Backbone.ajaxSync = Backbone.sync;
-Backbone.sync = Backbone.LocalStorage.sync;
+
+Backbone.getSyncMethod = function(model) {
+	if(model.localStorage || (model.collection && model.collection.localStorage))
+	{
+		return Backbone.localSync;
+	}
+
+	return Backbone.ajaxSync;
+};
+
+// Override 'Backbone.sync' to default to localSync,
+// the original 'Backbone.sync' is still available in 'Backbone.ajaxSync'
+Backbone.sync = function(method, model, options, error) {
+	Backbone.getSyncMethod(model).apply(this, [method, model, options, error]);
+};
 
 })();

tests/test.js

@@ -142,5 +142,21 @@ $(document).ready(function() {
 		book.destroy()
 		equals(Book.prototype.localStorage.findAll().length, 0, 'book removed');
 	});
-
+
+	test("Book should use local sync", function()
+	{
+		var method = Backbone.getSyncMethod(book);
+		equals(method, Backbone.localSync);
+	});
+
+	var MyRemoteModel = Backbone.Model.extend();
+
+	var remoteModel = new MyRemoteModel();
+
+	test("remoteModel should use ajax sync", function()
+	{
+		var method = Backbone.getSyncMethod(remoteModel);
+		equals(method, Backbone.ajaxSync);
+	});
+
 });