Backbone.js - Correct way of filtering and displaying collection data in a view

Question

I have got a huge list of tasks loaded on the start.
I want to show them depending on selected list / inbox, so that there won't be additional loadings for each list.

window.Task = Backbone.Model.extend({});

window.TasksCollection = Backbone.Collection.extend({
    model: Task,
    url: '/api/tasks',
    inbox: function() {
        return this.filter(function(task) {
            return task.get('list') == null;
        });
    },
    list: function(id) {
        return this.filter(function(task) {
            return task.get('list') == id;
        });
    }
});

window.tasks = new TasksCollection;

window.TaskView = Backbone.View.extend({
    tagName: 'li',
    template: _.template($('#item-template').html()),
    initialize: function() {
        _.bindAll(this, 'render', 'close');
        this.model.bind('change', this.render);
        this.model.view = this;
    },
    render: function() {
        $(this.el).html(this.template(this.model.toJSON()));
        this.setContent();
        return this;
    },
});

window.TasksView = Backbone.View.extend({
    el: '#todo-list',
    collection: tasks,
    initialize: function() {
        _.bindAll(this, 'render');
        this.collection.bind('reset', this.render);
        this.collection.fetch();
    },
    render: function() {
        var t = this;
        $(t.el).html('');
        this.collection.each(function(task) {
            var view = new TaskView({ model:task });
            $(t.el).append( view.render().el );
        });
        return this;
    },
});

window.Nicetask = Backbone.Router.extend({
    routes: {
        '':             'inbox',
        '/inbox':       'inbox',
        '/list/:id':    'list',
    },
    initialize: function() {
        _.bindAll(this, 'inbox', 'list');
        window.tasksView = new TasksView;
    },
    inbox: function() {
        tasks.reset( tasks.inbox() );
    },
    list: function(id) {
        tasks.reset( tasks.list(id) );
    }
});

This code works, but the reset() function removes other tasks in actual list from tasks collection. And on another route, tasks collection is empty.

Is there any reasonable way to achieve this? thanks for any idea.

ps: backbone novice

---

UPDATE

Thx to @sled and @ibjhb for comments, here is snippet of working solution.

window.TasksView = Backbone.View.extend({
    el: '#todo-list',
    collection: Backbone.Collection.extend(),
    initialize: function() {
        _.bindAll(this, 'render', 'addOne', 'addAll');
        this.collection.bind('add', this.addOne);
        this.collection.bind('reset', this.render);
    },
    render: function(data) {
        $(this.el).html('');
        _.each(data, function(task) {
            this.addOne(task);
        }, this);
        return this;
    },
    addOne: function(task) {
        var view = new TaskView({ model:task });
        $(this.el).append( view.render().el );
    },
});

window.Nicetask = Backbone.Router.extend({
    routes: {
        '':             'inbox',
        '/inbox':       'inbox',
        '/today':       'today',
        '/list/:id':    'list',
    },
    initialize: function() {
        _.bindAll(this, 'inbox', 'today');
        window.tasksView = new TasksView;
        window.menuView = new MenuListView;
        tasks.fetch();
    },
    inbox: function() {
        tasksView.render( tasks.inbox() );
    },
    today: function() {
        tasksView.render( tasks.today() );
    },
    list: function(id) {
        tasksView.render( tasks.list(id) );
    }
});

question from:https://stackoverflow.com/questions/6865174/backbone-js-correct-way-of-filtering-and-displaying-collection-data-in-a-view

Answer 1

I think you need to use another collection. For example, in your inbox, do this:

inbox: function(){
    currentCollection = new TasksCollection(tasks.inbox());
}

I haven't tested this but when you do a .reset(); you are removing all your models and loading the ones passed in.