Hacky ass ways to filter backbone collections

filter.js

Backbone.Collection.extend({
  // #sadface
  // collection.sadFilter().invoke('save') <- TypeError
  sadFilter : function (m) {
    return this.filter(function (m) {
      return m.get('happiness') < 1
    })
  },
  // First option
  // Wrap in underscore object

  // supports all underscore methods and all is joy
  // but what if I want to "colleciton.coolFilter().get(23)"
  // no dice
  coolFilter : function () {
    return _(this.filter(function (m) {
      return m.get('coolnes') > 9000
    }));
  },
  // Second option
  // instantiate a new collection from this constructor
  // _all_ underscore and collection models work
  // !!! remember it's a clone of the original collection, not
  // a reference. However, the models within the collection will
  // still reference the originals
  // ????
  // profit
  dopeFilter : function () {
    return new this.constructor(this.filter(function (m) {
      return m.get('dopeness') > 9000
    }));
  },
  // variation on #2
  radFilter : function () {
    return (new this.constructor).reset(this.filter(function (m) {
      return m.get('radness') > 9000
    }));
  }
});