extJS controller獲取後臺對象

在 model 中 Item 主表 通過 hasMany 綁定了 itemTariff 子表

hasMany: [
 {
            name: 'productTariffs',
            model: 'Ant.model.goods.ItemTariff',
            associationKey: 'productTariffs'
 },
 ]

viewModel定義了Itme對象

data:{
        item: null,
}

controller取值

   save: function (callback) {
        var me = this,
            form = me.lookupReference('skuForm')，
            item = me.getViewModel().get("item"),
            itemTariff = item.productTariffs()，
            if(itemTariff.data.length>0){
            var HScode = itemTariff.get('hsCode'),
                  tariff = itemTariff.get('tariff');
            alert(HScode+" "+tariff);
    }
}