angularfire-resource v0.0.3

angularfire-resource

Resource factory built on top of AngularFire

Alpha release, feedback apreciated

Abstract

Resource instances are extended firebaseObject, so you'll find everything you're used to with firebase object, plus

• createdAt / updatedAt timestamps
• hooks (beforeCreate, afterCreate, beforeSave, afterSave)
• a global instances map for each resource to ensure an instance is not retrieved 2 times from firebase
• associations (hasOne, hasMany, hasAndBelongsToMany returning respectively a firebaseObject instance or association collections)

AssociationCollection instances are extended firebaseArray, plus

• they are made of Resource instances
• they can preload their own instances associations
• they deal nicely with the firebase-util librairy for pagination & infinite scrolling work

Usage

Add the 'angularfire-resource' module as a dependency to your application module, and then define your model classes and their relations through the FireResource factory

angular.module('myApp', ['angularfire-resource'])

  .factory('$firebase', function() {
    return new Firebase('https://fireresourcetest.firebaseio.com/');
  })

  .factory('User', function(FireResource, $firebase) {
    return FireResource($firebase.child('users'))
      .hasMany('conversations')
      .hasOne('displayedConversation', {className: 'Conversation', inverseOf: false, foreignKey: 'displayedConversationId' })
  })
  
  .factory('Conversation', function(FireResource, $firebase) {
    return FireResource($firebase.child('conversations'), function(){
      this.hasMany('users');
      // customize the way you store foreign keys to be able to sort your association collection
      this.hasMany('messages', {storedAt: 'createdAtDesc' }, function(baseRef, init){
        // use firebase util to handle the pagination
        init(new Firebase.util.Scroll(baseRef, '$value')).$next(5);  
      });
      // use hooks
      this.beforeCreate(function(){        
        this.createdAtDesc = - Date.now()
      });
    });
  })
  
  .factory('Message', function(FireResource, $firebase) {
    return FireResource($firebase.child('messages'), function(){
      // define one sided association (ie here no message foreign key will be set into the user model)
      this.hasOne('user', { inverseOf: false }); 
      this.hasOne('conversation');
    });
  })
  

The above code will maintain a deserialized data model with duplicated foreign keys, to allow security enforcement and easy admin queries.

root
|_ users
| |_ userId1
| | |_ displayedConversationId: conversationId1
| | |_ conversations
| |   |_ conversationId1: true
| |_ userId2
|   |_ conversations
|     |_ conversationId1: true
|
|
|_ conversations
| |_ conversationId1
|   |_users
|   | |_ userId1: true
|   | |_ userId2: true
|   |_ messages
|     |_ messageId1: aCustomValue 
|     |_ messageId2: aCustomValue
|
|
|_ messages
  |_ messageId1
  | |_ userId: userId1
  | |_ conversationId: conversationId1
  |_ messageId2
    |_ userId: userId2
    |_ conversationId: conversationId1
    

And now you can write some clean controllers :-)

angular.module('myApp')

  // Let's asume $currentUser is an instance of User retrieved from a resolve
  .controller('ExamplesController', function($scope, Message, $currentUser){
    
    // $query on all ( rootUrl/users ) 
    $scope.allUsers = User.$query()
    
    // $query on some, customizing your ref
    $scope.someUsers = User.$query(function(baseRef, init){
      init(new Firebase.util.Scroll(baseRef, 'presence')).$next(10)
    });
    
    // use $next and $prev to access the scroll instance of your custom ref (if firebase util is used)
    $scope.loadMoreUsers = function(){
      $scope.someUsers.$next(10)
    };

    // preload associations
    $scope.conversations = $currentUser.$conversations().$include('messages')
    
    // Instanciate new model 
    $scope.newMessage = Message.$new()
    $scope.saveMessage = function(){
      angular.extend($scope.newMessage, { userId: $currentUser.$id });

      // save a new instance by adding it to a collection 
      $currentUser.$displayedConversation().$messages().$add($scope.newMessage)
      $scope.newMessage = Message.$new();
    };
    
    // do sequential operations
    $scope.createConversationWith = function(user) {
      // create an instance into a collection
      return $currentUser.$conversations().$create()
        .then(function (conversation) {
          // then add it to an other collection
          conversation.$users().$add(user);
        })
  })
    

Demo

To have a more in depth look over a practical case, check out the demo

API / Documentation

In progress here