javascript - Sort by attributes Backbone.js -

i trying sort collection , update view sorted collection. trying sort todo list done or not done tasks. in collection view have method:

    var addtask = backbone.view.extend({     el: '#todos',      initialize: function(){         this.collection.fetch();     },      events: {         'click #add': 'addtask',         'click #filter_done': 'sort_done',         'keypress #inputtask': 'updateonenter'     },      addtask: function(){          var tasktitle = $('#inputtask'). val();         $('#inputtask').val(""); //clear input          if($.trim(tasktitle) === ''){//check if input has text in             this.displaymessage("todo's can not empty");         }else{             var task = new task( {title: tasktitle} ); // create task model             this.collection.create(task); //add model collection                  }     },      displaymessage: function(msg){         $('#inputtask').focus().attr("placeholder", msg);     },      updateonenter: function(e){         if(e.keycode === 13){             this.addtask();         }     },      sort_done: function(){         var done = this.collection.where({done: true});      }  });  var addtask = new addtask( {collection: tasks} );  

my problem don't know how ask view render value returned sort_done method, , don't want lose information contained in original collection.

one way set comparator on collection, , re-render view on collection's 'sort' event.

initialize: function() {     // ...      this.collection.on('sort', this.render, this); },  sort_done: function() {     this.collection.comparator = function(model) {         return model.get('done') ? 1 : -1;     };      // trigger 'sort' event on collection     this.collection.sort(); } 

one disadvantage approach if collection shared between views, affect views of collection.