如何處理嵌套在RelationalModel中的集合？

Question

我用Backbone-Relational創建的模型層次複雜，代碼如下所示：

var ModelA = Backbone.Model.extend({ 
    initialize: function() { 
     console.log('model a initialized!') 
    } 
}); 

var CollectionA = Backbone.Collection.extend({ 
    model: ModelA 
}); 

var ModelB = Backbone.RelationalModel.extend({ 
    relations: [{ 
     type: Backbone.HasMany, 
     key: 'Collection', 
     collectionType: CollectionA 
    }] 
}); 

var data = new ModelB({ 
    name: 'ModelB', 
    Collection: [{ 
     name: 'ModelA-1' 
    }, { 
     name: 'ModelA-2' 
    }] 
}); 

console.log(data.get('Collection').at(0) instanceof ModelA); // false 
console.log(data.get('Collection').at(0) instanceof ModelB); // true 
console.log(JSON.stringify(data.toJSON())); 
// {"name":"ModelB","Collection":[{"name":"ModelA-1","Collection":[]},{"name":"ModelA-2","Collection":[]}]} 

正如你看到的，即使成功創建ModelB的ModelAinitialize()不叫。檢查類型證明集合中的對象不是ModelA。我怎樣才能解決這個問題？必要

Answer 1

兩個變化：使ModelA一個RelationalModel（而不僅僅是一個標準），並告訴ModelB那ModelA是其relatedModel，像這樣：

var ModelA = Backbone.RelationalModel.extend({ 
    initialize: function() { 
     console.log('model a initialized!') 
    } 
}); 
... 

var ModelB = Backbone.RelationalModel.extend({ 
    relations: [{ 
     type: Backbone.HasMany, 
     relatedModel: 'ModelA', 
     key: 'Collection', 
     collectionType: CollectionA 
    }] 
}); 

Demo。