gistfile1.txt

Model = function(){
  this.events = $({});
  this.attributes = {};
};

Model.prototype.set = function( key, value ){
    var self = this;
    var events = [];

    var cached_attributes = _.extend( {}, this.attributes );

    if( _.isObject( key ) ){
      _.each(key, function(v,k){
        self.attributes[k] = v;
        events.push({ key: k, value: v });
      });
    }

    if( key !== undefined && value !== undefined ){
      this.attributes[key] = value;
      events.push({ key: key, value: value });
    }

    var new_attributes = _.extend( {}, this.attributes );

    // trigger `change` events for the entire model and individual keys
    if( events.length ){
      this.events.trigger('change', [new_attributes]);

      if( self.collection ){
        self.collection.events.trigger('change', [ self, new_attributes ]);
      }

      _.each(events, function(event){
        if( cached_attributes[event.key] !== event.value ){

          self.events.trigger('change:'+ event.key,
                              [event.value, cached_attributes[event.key]]);

          if( self.collection ){
            self.collection.events.trigger('change:'+ event.key,
                                           [ self, event.value, cached_attributes[event.key] ]);
          }
        }

      });
    }
  };