1

我将一个简单的 DTO 实体 A 加载到我的结果视图模型中，它可以通过 Knockoutjs 愉快地查看。

我的 DTO A 包含一个列表实体。所以我可以遍历 A 中的元素。

再次：

class A
    {
       someprop;
        List<B> childB;
    }
Class B
{
   somepropB;
}

到目前为止，一切都很好。我可以毫无问题地遍历数据。但是，如果我在 A 和 SaveAll 的实例中更改“someprop”，则服务器根本不会响应。甚至没有调用 updateData 控件方法。如果我在将 childB.Clear() 传输给客户端之前清除它，一切都很好。

结果似乎无法使用集合更新实体？

4

1 回答 1

3

如果您希望这样的场景起作用，则需要做一些工作。结果仅将父实体变为可观察项。因此，只有 A 类的 javascript 表示是可观察的淘汰赛，B 类的 javascript 表示不是。因此 Upshot 不知道关联对象的任何变化。

解决方案是手动映射实体。为了让我的生活更轻松，我在下面的代码片段中使用了来自“DeliveryTracker”示例应用程序的代码。在我的博客文章中，您可以看到手动映射的示例：http: //bartjolling.blogspot.com/2012/04/building-single-page-apps-with-aspnet.html所以我下面的示例正在处理“交付” ' 和 '客户' 对象。

服务器端域模型

namespace StackOverflow.q9888839.UploadRelatedEntities.Models
{
    public class Customer
    {
        [Key]
        public int CustomerId { get; set; }

        public string Name { get; set; }
        public string Address { get; set; }
        public double Latitude { get; set; }
        public double Longitude { get; set; }

        public virtual ICollection<Delivery> Deliveries { get; set; }
    }

    public class Delivery
    {
        [Key]
        public int DeliveryId { get; set; }
        public string Description { get; set; }
        public bool IsDelivered { get; set; }

        [IgnoreDataMember] //needed to break cyclic reference
        public virtual Customer Customer { get; set; }
        public virtual int CustomerId { get; set; }
    }

    public class AppDbContext : DbContext
    {
        public DbSet<Customer> Customers { get; set; }
        public DbSet<Delivery> Deliveries { get; set; }
    }
}

数据服务控制器

数据服务控制器在“http://localhost:[yourport]/api/dataservice/GetCustomers”上公开符合 OData 标准的数据。为了能够同时更新客户和交货，您需要定义一个 UpdateCustomer AND UpdateDelivery 函数

namespace StackOverflow.q9888839.UploadRelatedEntities.Controllers
{
    public class DataServiceController : DbDataController<AppDbContext>
    {
        //Service interface for Customer
        public IQueryable<Customer> GetCustomers()
        {
            return DbContext.Customers.Include("Deliveries").OrderBy(x => x.CustomerId);
        }
        public void InsertCustomer(Customer customer) { InsertEntity(customer); }
        public void UpdateCustomer(Customer customer) { UpdateEntity(customer); }
        public void DeleteCustomer(Customer customer) { DeleteEntity(customer); }

        //Service interface for Deliveries
        public void InsertDelivery(Delivery delivery) { InsertEntity(delivery); }
        public void UpdateDelivery(Delivery delivery) { UpdateEntity(delivery); }
        public void DeleteDelivery(Delivery delivery) { DeleteEntity(delivery); }
    }
}

客户端领域模型

添加一个包含您的客户端模型的新 javascript 文件。在这里，我明确地将每个属性都变成了可观察到的淘汰赛。解决您的问题的关键是 Customer 对象的构造函数内的行，我将传入的交付映射到可观察的数组中

/// <reference path="_references.js" />
(function (window, undefined) {

    var deliveryTracker = window["deliveryTracker"] = {}; //clear namespace

    deliveryTracker.DeliveriesViewModel = function () {
        // Private
        var self = this;
        self.dataSource = upshot.dataSources.Customers;
        self.dataSource.refresh();
        self.customers = self.dataSource.getEntities();
    };

    deliveryTracker.Customer = function (data) {
        var self = this;

        self.CustomerId = ko.observable(data.CustomerId);
        self.Name = ko.observable(data.Name);
        self.Address = ko.observable(data.Address);
        self.Latitude = ko.observable(data.Latitude);
        self.Longitude = ko.observable(data.Longitude);

        self.Deliveries = ko.observableArray(ko.utils.arrayMap(data.Deliveries, function (item) {
            return new deliveryTracker.Delivery(item);
        }));

        upshot.addEntityProperties(self, "Customer:#StackOverflow.q9888839.UploadRelatedEntities.Models");
    };

    deliveryTracker.Delivery = function (data) {
        var self = this;

        self.DeliveryId = ko.observable(data.DeliveryId);
        self.CustomerId = ko.observable(data.CustomerId);
        self.Customer = ko.observable(data.Customer ? new deliveryTracker.Customer(data.Customer) : null);
        self.Description = ko.observable(data.Description);
        self.IsDelivered = ko.observable(data.IsDelivered);

        upshot.addEntityProperties(self, "Delivery:#StackOverflow.q9888839.UploadRelatedEntities.Models");
    };

    //Expose deliveryTracker to global
    window["deliveryTracker"] = deliveryTracker;
})(window);

风景

在 index.cshtml 中初始化 Upshot，指定自定义客户端映射并绑定视图模型

@(Html.UpshotContext(bufferChanges: false)
              .DataSource<StackOverflow.q9888839.UploadRelatedEntities.Controllers.DataServiceController>(x => x.GetCustomers())
              .ClientMapping<StackOverflow.q9888839.UploadRelatedEntities.Models.Customer>("deliveryTracker.Customer")
              .ClientMapping<StackOverflow.q9888839.UploadRelatedEntities.Models.Delivery>("deliveryTracker.Delivery")
)
<script type="text/javascript">
    $(function () {
        var model = new deliveryTracker.DeliveriesViewModel();
        ko.applyBindings(model);
    });
</script>

<section>
<h3>Customers</h3>
    <ol data-bind="foreach: customers">
        <input data-bind="value: Name" />

        <ol data-bind="foreach: Deliveries">
            <li>
                <input type="checkbox" data-bind="checked: IsDelivered" >
                    <span data-bind="text: Description" /> 
                </input>
            </li>
        </ol>
    </ol>
</section>

结果

导航到索引页面时，将异步加载客户列表和相关交货。所有交货均按客户分组，并以绑定到交货的“IsDelivered”属性的复选框为前缀。客户的姓名也是可编辑的，因为它已绑定到 INPUT 元素

我没有足够的声望来发布截图，所以你将不得不这样做

现在选中或取消选中 IsDelivered 复选框时，Upshot 将检测更改并将其发布到 DataService Controller

[{"Id":"0",
    "Operation":2,
    "Entity":{
        "__type":"Delivery:#StackOverflow.q9888839.UploadRelatedEntities.Models",
        "CustomerId":1,
        "DeliveryId":1,
        "Description":"NanoCircuit Analyzer",
        "IsDelivered":true
    },
    "OriginalEntity":{
        "__type":"Delivery:#StackOverflow.q9888839.UploadRelatedEntities.Models",
        "CustomerId":1,
        "DeliveryId":1,
        "Description":"NanoCircuit Analyzer",
        "IsDelivered":false
    }
}]

修改客户姓名时，Upshot会在输入框失去焦点时提交修改

[{
    "Id": "0",
    "Operation": 2,
    "Entity": {
        "__type": "Customer:#StackOverflow.q9888839.UploadRelatedEntities.Models",
        "Address": "Address 2",
        "CustomerId": 2,
        "Latitude": 51.229248,
        "Longitude": 4.404831,
        "Name": "Richie Rich"
    },
    "OriginalEntity": {
         "__type": "Customer:#StackOverflow.q9888839.UploadRelatedEntities.Models",
        "Address": "Address 2",
        "CustomerId": 2,
        "Latitude": 51.229248,
        "Longitude": 4.404831,
        "Name": "Rich Feynmann"
    }
}]

因此，如果您遵循上述程序，Upshot 将为您更新父实体和子实体。

于 2012-04-04T12:03:34.707 回答