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Flatten DS.ManyArray in Ember

Flatten a DS.ManyArray in Ember.js

Ember.ArrayProxy.prototype.flatten = Array.prototype.flatten = function() {
  var r = [];
  this.forEach(function(el) {
    r.push.apply(r, Ember.isArray(el)  ? el.flatten() : [el]);
  return r;

Use case

If you wanted to get all the books of all the authors in your library.

App.Author = DS.Model.extend
  books: DS.hasMany(

App.Book = DS.Model.extend()

App.Author.find().mapProperty('books').flatten() will return all books in an instance of a plain Array.

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