Backbone.js: correct way of filtering a collection?

Question

The current method I\'m using is to filter a collection, which returns an array, and use

collection.reset(array)

to re-populate it. However

Answer 1

The major problem on your code is that you are using a raw array as original, instead of a Collection. My code is close to the yours but use only Collections, so methods like add, remove and filter works on the original:

  var OriginalCollection = Backbone.Collection.extend({
  });
  var FilteredCollection = Backbone.Collection.extend({
    initialize: function(originalCol){
        this.originalCol = originalCol;
        this.on('add', this.addInOriginal, this);
        this.on('remove', this.removeInOriginal, this);
    },
    addInOriginal: function(model){
        this.originalCol.add(model);
    },
    removeInOriginal: function(model){
        this.originalCol.remove(model);
    },
    filterBy: function(params){
        var filteredColl = this.originalCol.filter(function(item){
            // filter code...
        });
        this.reset(filteredColl);
    }   
  });