從骨幹模式陣列屬性刪除元素

Question

我的模型是

var Storage = Backbone.Model.extend({ 
    defaults: { 
     q_category_id : 2, 
     dimension: [] 
    } 
}); 

我充滿名爲storageInfo模型實例與

{ 
    "q_category_id":2, 
    "dimension":[ 
     {"q_id":1,"q_text":"...","data_type":"1","meta":"15","answer":"152"}, 
     {"q_id":2,"q_text":"...","data_type":"1","meta":"30","answer":"302"}, 
     {"q_id":3,"q_text":"...","data_type":"1","meta":"60","answer":"602"} 
    ] 
} 

，但發送到服務器之前，我希望模型是像這樣：

{ 
    "q_category_id":2, 
    "dimension":[ 
     {"q_id":1,"answer":"152"}, 
     {"q_id":2,"answer":"302"}, 
     {"q_id":3,"answer":"602"} 
    ] 
} 

如何刪除屬性如q_text,datatype和meta從我的模型的dimension數組？

Answer 1

您可以使用下劃線map和pick方法來做到這一點相當簡潔：

storageInfo.dimensions = _.map(storageInfo.dimensions, function(obj) { 
    return _.pick(obj, 'p_id', 'answer'); 
}); 

Answer 2

您可以保存模型，採用順位被net.uk.sweet的建議之前，通過迭代的尺寸。 否則，試圖改變這種模式的toJSON方法，所以它總是返回字段，你寧願：

var Storage = Backbone.Model.extend({ 
    defaults: { 
    q_category_id : 2, 
    dimension: [] 
    }, 
    toJSON: function() { 
    var dims = _.pick(this.get('dimensions'), ['q_id', 'answer']); 
    return {q_category_id: this.get('q_category_id'), dimensions: dims} 
    } 
});