訪問模型中兒童的最佳方式

Question

在路線中訪問模型兒童的最佳方式是什麼？

路線代碼：

this.store.find('Parent', params.parent_id).then(function(parent){ 
    //this works 
    var a = parent._data.children.length; 
    //this doesn't but feels like it should? 
    var a = parent.get('children').length; 
}) 

型號：

App.Parent = DS.Model.extend({ 
    ... 
    children: DS.hasMany('child', {async: true}), 
}); 

Answer 1

var a = parent.get('children').length; 

大概是返回一個承諾。您可以通過執行console.log('children', parent.get('children')來檢查。您可以在檢查長度前通過以下方式解決此承諾：

var a; 
parent.get('children').then(function (children) { 
    // Children promise has been resolved 
    a = children.length; 
});