init

.gitignore

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+.DS_Store
+node_modules/

.travis.yml

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+language: node_js
+node_js:
+  - "0.8"

Gruntfile.js

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+grunt.loadNpmTasks('grunt-contrib-concat');
+
+module.exports = function(grunt) {
+  uglify:{
+    dist:{
+      'backbone-sync-deferred.min.js': ['backbone-sync-deferred.js']
+    }
+  }
+};
+
+grunt.registerTask('build', ['concat', 'uglify']);

backbone-sync-deferred.js

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+'use strict';
+// CommonJS support for easier testing
+(function(root,factory, undefined){
+    if (module !== undefined) {
+        // CommonJS
+        module.exports = factory(
+          require('backbone'),
+          require('jquery')
+        );
+    } else {
+        // Browser mode. Just inject manually the dependencies that should be defined in
+        // the global window scope.
+        root.Backbone.sync = factory(root.Backbone, root.$);
+    }
+})(this,function(Backbone, $){
+
+  // Keep track of original sync
+  var origSync = Backbone.sync;
+
+  var newSync = function(method, model, options) {
+
+    // Keep track of original callbacks to have a seamless integration
+    var origSuccess = options.success;
+    var origError = options.error;
+
+    // Let's get a nice promise
+    var deferred = $.Deferred();
+
+    // Override success
+    options.success = function(model, response, options) {
+      if (origSuccess) origSuccess(model, response, options);
+      return deferred.resolve(model);
+    };
+    // Override error
+    options.error = function(model, response, options) {
+      if (origError) origError(model, response, options);
+      return deferred.reject(response.responseText);
+    };
+
+    origSync(method, model, options);
+
+    return deferred.promise;
+  };
+
+  return newSync;
+
+});

package.json

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+{
+  "name": "backbone-sync-deferred",
+  "version": "0.0.1",
+  "description": "Override Backbone.sync for a lightweight and seamless integration of promise with Backbone",
+  "main": "backbone-sync-deferred.bundle.min.js",
+  "scripts": {
+    "test": "mocha tests/tests.js --reporter nyan",
+    "postinstall": "npm install -g mocha"
+  },
+  "repository": "",
+  "keywords": [
+    "backbone",
+    "deferred",
+    "promise",
+    "asynchronous"
+  ],
+  "author": "Nicolas Kermarc <@spacenick>",
+  "license": "MIT",
+  "devDependencies": {
+    "chai": "~1.6.1",
+    "backbone": "~1.0.0",
+    "jquery": "~1.8.3",
+    "grunt": "~0.4.1",
+    "grunt-contrib-concat": "~0.3.0",
+    "grunt-contrib-uglify": "~0.2.2"
+  }
+}

tests/data.json

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+{
+  "some":"data"
+}

tests/tests.js

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+var assert = require("chai").assert;
+var Backbone = require("backbone")
+var BackboneSyncDeferred = require('../backbone-sync-deferred.js');
+var $ = require('jquery');
+
+Backbone.$ = $;
+
+describe('Backbone Model sync overrided', function(){
+  describe('fetch', function(){
+
+
+
+    it('should return a promise', function(done){
+      var model = new Backbone.Model();
+      model.url = "https://api.github.com/users/spacenick";
+      var p = model.fetch();
+      assert.typeOf(p.then, 'function');
+      p.then(function(data){
+        assert.typeOf(data, 'object');
+        done();
+      });      
+    });
+
+
+    it('should trigger the error handler', function(done){
+      var model = new Backbone.Model();
+      // Let's have a 404 url
+      model.url = "https://api.github.com/users/spacenic";
+      var p = model.fetch();
+      assert.typeOf(p.then, 'function');
+      p.then(function(data){
+        assert.typeOf(data, 'object');
+        done();
+      },
+      function(error){
+        done();
+      });      
+    });
+
+    it('should seamlessly execute the default fetch callback', function(done){
+      var model = new Backbone.Model();
+      // Let's have a 404 url
+      model.url = "https://api.github.com/users/spacenick";
+      var p = model.fetch();
+      assert.typeOf(p.then, 'function');
+      p.then(function(data){
+        assert.equal(model.get('login'), 'spacenick');
+        done();
+      });      
+    });
+
+
+  })
+})