我应该添加自定义方法到Ext.data.store派生类 [英] Should I add custom methods to Ext.data.store derived classes

问题描述

我完全陌生的触摸和伸展。以下是这种情况：

假设您拥有购物车中商品的商店：

  Ext.define（'MyApp.store.CardItems'，{
 extends：'Ext.data.Store'，
 require：['MyApp.model.CardItem' 'Ext.data.proxy.SessionStorage']，
 
 config：{
 model：'MyApp.model.QuoteItem'，
 autoLoad：true，
 autoSync： true，
 identifer：'uuid'，
 proxy：{
 type：'sessionstorage'，
 id：'card'
} 
} 
  

}）;

我知道在sencha store 用于将模型项目列表绑定到网格。我只是想知道是否也可以添加自定义方法到这个类。

例如。假设我们需要一种方法来获取商店中所有商品的总体计数。从OOP的角度来看，我有理由直接在商店上引入这种方法：

  getOverallQuantity：function（）{ 
 var sum = 0; 
 this.each（function（item）{
 sum + = parseInt（item.get（'amount'））; 
}，this）; 
返还金额
} 
  

我只是想知道直接在商店上直接使用这些方法是个好主意或者是因为某些原因避免这种情况？

解决方案

继续Christoph扩展你的课程，这是你的生意OK :)

我正在创建大型的商店/模型/代理层次结构，一切正常。 Sencha基金会（SFC！）它很酷！

干杯，Oleg

I'm totally new to sencha touch and extjs. Here is the scenario:

Suppose you have this store that holds the items on a shopping cart:

Ext.define('MyApp.store.CardItems', {
    extend: 'Ext.data.Store',
    requires: ['MyApp.model.CardItem','Ext.data.proxy.SessionStorage'],

    config :{
        model: 'MyApp.model.QuoteItem',
        autoLoad: true,
        autoSync: true,
        identifer: 'uuid',
        proxy:{
            type:'sessionstorage',
            id:'card'
        }
    }

});

I know that in sencha a store is used to bind a list of model items to a grid for example. I just wonder if it's a good idea to also add custom methods to this class.

For instance. Suppose we need a method to get the overall count of all items in the store. From an OOP point of view it makes sense to me to introduce such method directly on the store:

getOverallQuantity:function () {
    var sum = 0;
    this.each(function (item) {
        sum += parseInt(item.get('amount'));
    }, this);
    return sum;
}

I just wonder if it's a good idea to have those methods directly on the store or if that is to avoid for some reason?

解决方案

Go ahead Christoph with extending your classes, it is your business, it is OK :)

I'm creating large hierarchy of stores/models/proxies and all is working. Sencha Foundation Classes (SFC!) it cool!

Cheers, Oleg

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