Question

我有一个model :

window.LayerModel = Backbone.Model.extend({

        defaults:{
             id : unknow ,
             type : unkonw ,
             preId : unknow ,

             data : {}
        }
}

然后我定义了一个集合:

window.LayerManageCollection = Backbone.Collection.extend({
            model: LayerModel
    })

然后我就把它写进去看:

        window.LayerMasterManageView = Backbone.View.extend({

              initialize: function () {
                  //here I have a gobal javascript variable named "localdata"
                  //which have 17 items in an array,each of them is object type

                  this.collection = new LayerManageCollection(localdata);
                  console.log( this collection , this.collection);
              }
}

但收藏的长度是1!只有一种型号。

奇怪的是,如果将 默认值 更改为 默认值 , 收藏结果会像我所希望的那样, 长度为 17 。

为什么发生这种事我怎样才能解决这个问题?

Answer 1

默认 idAtritte 是一个模型。由于您在 defaults 中重新定义了 id 。由于您在 defaults 中定义了 < > /code>,您将永远创建同样的模型,因为创建重复的模型时, Backbone会悄悄地出错,所以您只看到一个模型。

Answer 2

i think your problem is with the objects present in your localdata.
how many objects in your localdata have different id field
either you should provide different id to every object in your localdata array or just remove the id field from defaults in the model LayerModel

whenever you change the name from defaults to default then because there is no default id backbone takes it as a new model and hence adds it to the collection.

so you can change defaults to any other name like abc and it will have the same behaviour

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