我觉得我必须遗漏一些明显的东西,但是如何从父母中的hasMany定义的子对象中访问父对象?
我们有分层数据模型。
我们正在从一个大的旧JSON对象中加载整个shebang,如:
var json_data = {
"app_id": 100,
"name": "My Cool App"
"categories": [{
"cat_id": 100,
"name": "First Category",
"layers": [{
"layer_id": 100
"name": "First Layer"
},{
"layer_id": 200
"name": "Second Layer"
}]
},{
"cat_id": 200,
"name": "Second Category",
"layers": [{
"layer_id": 300
"name": "Third Layer"
},{
"layer_id": 400
"name": "Fourth Layer"
}]
}]
}
并且模型看起来(大致)像:
App.AppConfig = Ember.Model.extend({
app_id: attr(),
appName: attr(),
categories: hasMany('App.Category', {key: 'categories', embedded: true})
});
App.Category = Ember.Model.extend({
cat_id: attr(),
name: attr(),
layers: hasMany('App.Layer', {key: 'layers', embedded: true})
});
App.Layer = Ember.Model.extend({
layer_id: attr(),
name: attr(),
init: function() {
this._super();
this.on('didLoad', this, this.setDefaults);
},
setDefaults: function() {
//This is the line I can't figure out
var my_parent_category = this.get('parent');
}
});
好的,那么我们:
var appConf = App.AppConfig.create();
appConf.load(1, json_data);
所以考虑到这一点,从App.Layer实例的方法中,我如何做类似的事情
this.get('parent')
获取图层所属的App.Category对象的句柄?