如何从 ExtJs 4 中的商店访问嵌套模型 [英] How to access nested models from store in ExtJs 4

问题描述

我刚刚下载了 ExtJs 4 的最终版本，我正在尝试使用新的模型方法来实现一些东西.

I just downloaded the final version of ExtJs 4 and I'm trying to implement some things using new Model approach.

例如，我有一个名为 SetupModel 的模型，它有 2 个嵌套模型用户、报告.我创建新商店并设置商店的 Model 属性 = SetupModel.

For instance I have a model named SetupModel, it has 2 nested models Users, Reports. I create new store and I set the Model property of the store = SetupModel.

问题是 - 在数据加载到商店后，我如何访问我的嵌套属性?

The question is - how can I access my nested properties after data was loaded into the store?

我需要类似 myStore.data.Users() 的东西，但不正确.

I need something like myStore.data.Users(), but is incorrect.

有什么想法吗?

推荐答案

在定义模型时，您需要提供与嵌套模型的必要关联.因为，您没有提供您的代码.下面是一个例子:

When you define your model, you need to provide the necessary association with the nested models. Since, you have not provided your code. Here is an example:

我的产品型号:

Product = Ext.define('Product',{
    extend: 'Ext.data.Model',
    fields: [
        {name: 'id', type: 'int'},
        {name: 'user_id', type: 'int'},
        {name: 'name', type: 'string'},
        {name: 'price', type: 'float'}
    ],
    proxy: {
        type: 'localstorage',
        id: 'products'
    }
});

我的用户模型:

User = Ext.define('User',{
    extend: 'Ext.data.Model',
    fields: [
        {name: 'id',       type: 'int'},
        {name: 'name',     type: 'string'},
        {name: 'gender',   type: 'string'},
        {name: 'username', type: 'string'}
    ],
    associations: [
        {type: 'hasMany', model: 'Product', name: 'products'}
    ],
    proxy: {
        type: 'localstorage',
        id  : 'users'
    }
});

现在，如果您有一个包含产品的 User 模型实例.您可以通过以下方式访问产品:

Now, if you have a instance of User model with products. Here is how you can access the products:

var productStore = user.products();

注意 user.products() 返回一个 Ext.data.Store.现在，您可以遍历或过滤或查找您的产品记录.以下是我获得第一个产品名称的方式:

Note that user.products() returns a Ext.data.Store. Now, you can traverse or filter or find your product record. Here is how I got my first product's name:

productStore.getAt(0).get('name');

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