javascript - knockoutjs mapping custom objects with nesting array -

i want map json custom objects. problem items not typeof item object normal objects. i'm missing here?

you can test here: http://jsfiddle.net/5jhpe/

var json = [     {         id: 1,         items: [             {id: 1, name: 'item1'},             {id: 2, name: 'item2'},             {id: 3, name: 'item3'}         ]     },     {         id: 2,         items: [             {id: 4, name: 'item4'},             {id: 5, name: 'item5'},             {id: 6, name: 'item6'}         ]     }, ]  function data(data) {     ko.mapping.fromjs(data, {}, this); }  function item(data) {     ko.mapping.fromjs(data, {}, this); } var map = {     create: function(options) {         return new data(options.data);     },     items: function(options) {         return new item(options.data);     }, }  var res = ko.mapping.fromjs(json, map); 

output:

console.log(res()); [data, data] -- console.log(res()[0].items()); [object, object, object] <-- here want have [item, item, item] 

i've changed mapper options in way

var map = {     'items': {         create: function(options) {             return new item(options.data);         }     } } 

and seems fine; try?

if need: jsfiddle console output [item, item, item] want;

---

i permit add 1 little suggestion: if need test typeof in way:

typeof res()[0].items()[0] 

pay attention, tricky!

to avoid problem, declare item viewmodel in way:

function item(data) {     var self = this;     self.mytype = 'item';     ko.mapping.fromjs(data, {}, this); } 

so can test, example :

if('item' === res()[0].items()[0].mytype) {   //do something... } 

this "mytype" trick suggests here in stackoverflow time ago: i'll post link here i'll find post