asp.net-mvc-4 – 如何通过MVC4 upshot上传相关实体

我得到一个简单的DTO实体A加载到我的upshot viewmodel中,可以通过Knockoutjs快乐地查看.

我的DTO A包含一个List实体.所以我可以预测A内的元素.

再次：

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

到现在为止还挺好.我可以毫无问题地迭代数据.
但是如果我在A和SaveAll的实例中更改“someprop”,服务器根本不会响应.
甚至不调用updateData控件方法.
如果我在将childB.Clear()发送到客户端之前清除它,一切都很好.

看起来结果是无法用集合更新实体？

解决方法

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我的“DeliveryTracker”示例应用程序中的代码.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所以我的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

数据服务控制器公开符合OData标准的数据
的 “http：//本地主机：[yourport] / API / DataService的/ GetCustomers的”.为了能够更新客户和交付,您需要定义UpdateCustomer和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); }
    }
}

客户端域模型

添加包含客户端模型的新javascript文件.在这里,我明确地将每个房产变成了一个可以观察到的淘汰赛.解决问题的关键是Customer对象的构造函数中的行,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viewmodel

@(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付.所有交货按客户分组,并使用与交货的“IsDelivered”属性绑定的复选框进行预先修复.客户的名称也是可编辑的,因为它绑定到INPUT元素

我没有足够的声誉来发布截图,所以你必须没有它

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","IsDelivered":false
    }
}]

修改客户名称时,Upshot将在输入框失去焦点时提交更改

[{
    "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","Name": "Rich Feynmann"
    }
}]

因此,如果您按照上述步骤操作,Upshot将为您更新父实体和子实体.

（编辑：安卓应用网）

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