began work on localStorage adapter

packages/ember-data/lib/adapters/localStorage_adapter.js

@@ -0,0 +1,50 @@
+var get = Ember.get, set = Ember.set, getPath = Ember.getPath;
+
+DS.localStorageAdapter = DS.Adapter.extend({
+  createRecord: function(store, type, model) {
+    var records = this.local.get(type);
+    var id = records.length + 1;
+    model.set('id', id)
+
+    var data = get(model, 'data');
+    records[id] = data;
+
+    this.local.set(type, records);
+    store.didCreateRecord(model, data);
+  },
+  updateRecord: function(store, type, model) {
+    var id = get(model, 'id');
+    var data = get(model, 'data');
+
+    var records = this.local.get(type);
+    records[id] = data;
+
+    this.local.set(type, records);
+    store.didUpdateRecord(model, data);
+  },
+
+  find: function(store, type, id) {
+    var records = this.local.get(type);
+    store.load(type, records[id]);
+  },
+
+  findAll: function(store, type) {
+    var records = this.local.get(type);
+
+    if (records) {
+      store.loadMany(type, records)
+    }
+  },
+
+
+  local: {
+    set: function(key, value) {
+      localStorage.setItem(key, JSON.stringify(value));
+    },
+    get: function(key) {
+      var value = localStorage.getItem(key);
+      value = JSON.parse(value) || [];
+      return value;
+    }
+  }
+});

packages/ember-data/tests/unit/localStorage_adapter_test.js

@@ -0,0 +1,83 @@
+require('ember-data/adapters/localStorage_adapter');
+
+var get = SC.get, set = SC.set;
+
+var adapter, store;
+var Person, person, people;
+var Role, role, roles;
+
+localStorage.clear();
+
+module("the localStorage adapter", {
+  setup: function() {
+    adapter = DS.localStorageAdapter.create();
+
+    store = DS.Store.create({
+      adapter: adapter
+    });
+
+    Person = DS.Model.extend({
+      name: DS.attr('string')
+    })
+    Person.toString = function() {
+      return "App.Person";
+    }
+
+    Role = DS.Model.extend({
+      name: DS.attr('string'),
+      primaryKey: '_id'
+    })
+    Role.toString = function() {
+      return "App.Role";
+    }
+  },
+  teardown: function() {
+    adapter.destroy();
+    store.destroy();
+
+    if (person) { person.destroy(); }
+  }
+});
+
+var expectState = function(state, value, p) {
+  p = p || person;
+
+  if (value === undefined) { value = true; }
+
+  var flag = "is" + state.charAt(0).toUpperCase() + state.substr(1);
+
+  equal(get(p, flag), value, "the person is " + (value === false ? "not " : "") + state);
+};
+
+test("creating a person makes a save to localStorage, with the data", function() {
+  set(adapter, 'bulkCommit', false);
+
+  person = store.createRecord(Person, {name: "Tom Dale"});
+
+  expectState('new');
+  store.commit();
+
+  expectState('saving', false);
+  equal(person, store.find(Person, 1), 'it is now possible to retrieve the person by the ID supplied')
+
+});
+
+test("updating a person makes a save to the same key with the new data", function() {
+  set(adapter, 'bulkCommit', false);
+
+  store.load(Person, { id: 1, name: "Yehuda Katz" });
+
+  person = store.find(Person, 1);
+
+  expectState('new', false);
+  expectState('loaded');
+  expectState('dirty', false);
+
+  set(person, 'name', "Brohuda Brokatz");
+
+  expectState('dirty');
+  store.commit();
+  expectState('saving', false);
+
+  equal(person, store.find(Person, 1), "the same person is retrieved by the same ID");
+});