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ember-cli addon that provides a simple identity map for ember.js web applications


ember install ember-cli-simple-store

You get 6 methods: push/pushArray/remove/find/findOne/clear

//create or update person model 
simpleStore.push("person", {id: 1, name: "toran"});
//create or update multiple person models - observers are notified only once all models have been created or updated 
simpleStore.pushArray("person", [{id: 1, name: "john"}, {id: 2, name: "jane"}]);
//remove person model with id=123 
simpleStore.remove("person", 123);
//find all person models 
//find a single person model with id=123 
simpleStore.find("person", 123);
//find all person models with account_id=789 
simpleStore.find("person", {account_id: 789});
//find all person models with name toran and salary > 100 
var filter = function(person) {
    var name = person.get("name");
    var salary = person.get("salary");
    return name === "toran" && salary > 100;
simpleStore.find("person", filter);
//find the first person model 
//clear the entire identity map of all person models 
//clear the entire identity map of all models 

Using the store by example

Below I'll show how you can use the store with a simple ember object to find/add/remove/update

The full example below relies on a small xhr addon PromiseMixin

import Ember from "ember";
import PromiseMixin from "ember-promise/mixins/promise";
var PersonRepository = Ember.Object.extend({
    simpleStore: Ember.inject.service(),
    find() {
        var simpleStore = this.get("simpleStore");
        return PromiseMixin.xhr("/api/people/", "GET").then(function(response) {
            response.forEach(function(person) {
                simpleStore.push("person", person);
            return simpleStore.find("person");
    findById(id) {
        var simpleStore = this.get("simpleStore");
        return simpleStore.find("person", id);
    insert(person) {
        var simpleStore = this.get("simpleStore");
        var hash = {data: JSON.stringify(person)};
        return new Ember.RSVP.Promise(function(resolve,reject) {
            return PromiseMixin.xhr("/api/people/", "POST", hash).then(function(persisted) {
                var inserted = simpleStore.push("person", persisted);
            }, function(err) {
    update(person) {
        var person_id = person.get("id");
        var hash = {data: JSON.stringify(person)};
        var endpoint = "/api/people/%@/".fmt(person_id);
        return PromiseMixin.xhr(endpoint, "PUT", hash);
    remove(person) {
        var simpleStore = this.get("simpleStore");
        var person_id = person.get("id");
        var endpoint = "/api/people/%@/".fmt(person_id);
        return new Ember.RSVP.Promise(function(resolve,reject) {
            return PromiseMixin.xhr(endpoint, "DELETE").then(function(arg) {
                simpleStore.remove("person", person_id);
            }, function(err) {
export default PersonRepository;

What about relationship support?

A one-to-many example might look something like this

import Ember from 'ember';
export default Ember.Object.extend({
    simpleStore: Ember.inject.service(),
    role: Ember.computed.alias('belongs_to.firstObject'),
    belongs_to: Ember.computed(function() {
        let userId = this.get('id');
        let simpleStore = this.get('simpleStore');
        let filter = function(role) {
            let users = role.get('users');
            return Ember.$.inArray(userId, users) > -1;
        return simpleStore.find('role', filter);
//a test to show how this api works from the outside 
test('role property returns associated model or undefined', function(assert) {
    let user = simpleStore.push('user', {id: 1});
    simpleStore.push('role', {id: 2, name: 'Admin', users: [1]});
    let role = user.get('role');
    assert.equal(role.get('id'), 2);
    assert.equal(role.get('name'), 'Admin');
    role.set('users', []);
    role = user.get('role');
    assert.equal(role, undefined);

What about dirty tracking?

If you want the ability to track if your model is dirty use the attr for each field and the Model to get save/rollback

import { attr, Model } from "ember-cli-simple-store/model";
var Person = Model.extend({
    firstName: attr(),
    lastName: attr(),
    fullName: function() {
        var first = this.get("firstName");
        var last = this.get("lastName");
        return first + " " + last;
    }.property("firstName", "lastName")
//save your object to reset isDirty 
var person = Person.create({id: 1, firstName: "x", lastName: "y"});
person.set("firstName", "toran");;
//rollback your object to reset isDirty and restore it 
person.set("firstName", "foobar");

If you want to know if an individual property isDirty you can ask like so

person.get("firstNameIsDirty"); //undefined 
person.set("firstName", "foobar");
person.get("firstNameIsDirty"); //true 

For new forms that start with undefined properties you can define the default state for isDirty. Example: you have a model that is bound to a form with a checkbox input. The create form starts with a new model so each bound property is undefined. If the user decides to check the bound checkbox (setting the value to true) and then decides to uncheck it (setting the value to false) you would expect the form is not dirty - but because undefined !== false you find the model is dirty. To prevent this behavior set a default value for dirty tracking on the models attr like so.

var Animal = Model.extend({
    omnivore: attr(false)
var animal = Animal.create();
animal.get("omnivore"); //undefined 
animal.get("isDirty"); //false 
animal.set("omnivore", true);
animal.get("isDirty"); //true 
animal.set("omnivore", false);
animal.get("isDirty"); //false 

What about custom primary keys?

By default, simple store will use the 'id' property on your records as the primary key. If you wish to override this, reopen your model class and add a primaryKey attribute.

var Food = Ember.Object.extend({
    food_id: null,
    calories: null
    primaryKey: 'food_id'
simpleStore.push('food', {
    food_id: 5,
    calories: 500
// Returns the pushed record 
simpleStore.find('food', 5);

Example applications

Simplest example with the least amount of complexity (tests included)

Simple example running ember 2.4

Async example that will paint right away (loading section included w/ tests)

Async example with relationships (loading section included w/ tests)

Dirty tracking example with both save and rollback

Running the unit tests

npm install
ember test


Copyright © 2015 Toran Billups

Licensed under the MIT License