Ember.js Grouping Results

Question

I\'m trying to achieve a \"group by\" functionality in Ember.js and its proving more difficult than I originally thought.

[{date: \'2014-01-15T16:22:16-08:00\',          


        

Answer 1

Here is an implementation, made available on Array objects:

var groupByMethod = Ember.Mixin.create({
  groupBy: function(key) {        
    var result = [];
    var object, value;

    this.forEach(function(item) {
      value = item.get ? item.get(key) : item[key];
      object = result.findProperty('value', value);
      if (!object) {
        object = {
          value: value,
          items: []
        };
        result.push(object);
      }
      return object.items.push(item);
    });

    return result.getEach('items');
  }
});

groupByMethod.apply(Array.prototype);

Usage:

> var posts = [{id: 1, author: 'John'}, {id:2, author: 'Paul'}, {id:4, author: 'Paul'}, {id:5, authour: 'Tom'}];

> posts.groupBy('author')