mvvm - 剑道数据源 : How to define "Computed" Properties for data read from remote odata source

Question

情况:

• 剑道数据源

  var ordersDataSource = new kendo.data.DataSource({
      type: "odata",
      transport: {
          read: {
              url: "http://localhost/odata.svc/Orders?$expand=OrderDetails"
          }
      },
      schema: {
          type: "json",
          data: function(response){
              return response.value;
          }
          total: function(response){
              return response['odata.count'];
          }
      },
      serverPaging: true,
      serverFiltering: true,
      serverSorting: true
  })
  

• 从odata源读取的json数据是这样的:

  {
      odata.metadata: "xxxx",
      odata.count: "5",
      value: [
          {
              OrderId: 1,
              OrderedDate: "2013-02-20",
              OrderInfoA: "Info A",
              OrderInfoB: "Info B"
              OrderDetails: [
                  {
                      OrderDetailId: 6,
                      OrderDetailInfoC: "Info C",
                      OrderDetailInfoD: "Info D"
                  },
                  {
                      //Another OrderDetail's data
                  }
              ]
          },
          {
              // Another Order's data
          }
      ]
  }
  

问题 1:

1.如果我想定义一个“计算”属性:OrderedDateRelative，它应该是今天(2013-02-25)和订单创建日期(2013- 02-20)，比如:“5 天前”，我如何在客户端实现这一点？

问题 1 的答案:http://jsbin.com/ojomul/7/edit

问题 2 --更新--

2.每个订单都有其嵌套的属性OrderDetails，那么是否可以为嵌套的OrderDetails 属性定义一个计算字段？例如:每个 OrderDetail 的 OrderDetailInfoCAndD，值应该类似于:OrderDetailInfoC + OrderDetailInfoD，即“信息 C 信息 D”？

谢谢，

院长

Answer 1

您可以通过指定数据源的模型来创建计算字段:

  dataSource = new kendo.data.DataSource({
    data: [
      { first: "John", last: "Doe" }, 
      { first: "Jane", last: "Doe" }
    ],
    schema: {
      model: {
        // Calculated field
        fullName: function() {
          return this.get("first") + " " + this.get("last");
        }
      }
    }
  });

这是一个现场演示:http://jsbin.com/ojomul/1/edit