lmd/examples/demos/backbone_lmd/js/collections/todos.js

LMD: Lazy Module Declaration

var _ = require('_'),
    backbone = require('backbone'),
    Store = require('store'),
    Todo = require('todoModel');

var TodosCollection = backbone.Collection.extend({
    // Reference to this collection's model.
    model: Todo,

    // Save all of the todo items under the `"todos"` namespace.
    localStorage: new Store('todos-backbone'),

    // Filter down the list of all todo items that are finished.
    completed: function() {
        return this.filter(function( todo ) {
            return todo.get('completed');
        });
    },

    // Filter down the list to only todo items that are still not finished.
    remaining: function() {
        return this.without.apply( this, this.completed() );
    },

    // We keep the Todos in sequential order, despite being saved by unordered
    // GUID in the database. This generates the next order number for new items.
    nextOrder: function() {
        if ( !this.length ) {
            return 1;
        }
        return this.last().get('order') + 1;
    },

    // Todos are sorted by their original insertion order.
    comparator: function( todo ) {
        return todo.get('order');
    }
});

module.exports = new TodosCollection();