Question

我使用Backbone-Relational来创建复杂的模型层次结构，代码如下所示：

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":[]}]}

如您所见，即使ModelB成功创建，initialize() ModelA也未被调用。检查类型证明集合中的对象不是ModelA。我该如何解决这个问题？

Answer 1

需要进行两项更改：将ModelA设为RelationalModel（而不仅仅是标准版），并告诉ModelB ModelA是relatedModel，就像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 }] });一样这样：

{{1}}

Demo

如何处理嵌套在RelationalModel中的集合？

1 个答案: