Filter Backbone.Collection items by more that one attribute..

backbone-collection-getByAttributes.js

// @deprected

// This GIST is deprected!
//_.findWhere() is exactly what you're searching for ;-)

// Example: 
// collection.findWhere({
//    color: 'red',
//    brand: 'vw'
// })


// Backbone.Collection.getByAttrs

// Filter items by more that one attribute
// Currently is not possible to filter more
// than 2 pairs of value's.
// Returns[Array] of models which fulfill the
// filter requirements.
// 
// @todo: Check for more that only two pairs. 
// @todo: Change parameter-type from Array (of Objects) 
//        to Object (of Objects).
//
// Example: 
// collection.getByAttrs([
//  {color: 'red'},
//  {brand: 'vw'}
// ]);
//
getByAttrs : function(attrs) {
  var
      _opts = { attr : [], val : [] },
      _this = this,
      _matched = function(attr, val) {
          return attr == val ? true : false;
      }

    _(attrs).each(function(v) {
        _opts.attr.push(_.keys(v)[0]);
        _opts.val.push(_.values(v)[0]);
    });

    return this.filter(function(model) {
        return
            _matched(model.get(_opts.attr[0]), _opts.val[0]) &&
            _matched(model.get(_opts.attr[1]), _opts.val[1]);
    });
}