如何通过MVC4 upshot上传相关实体

Question

我将一个简单的DTO实体A加载到我的upshot视图模型中，它可以通过Knockoutjs查看。

我的DTO包含一个实体列表。所以我可以遍历A内部的元素。

再一次：

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

到目前一切尚好。我可以毫无问题地迭代数据。但是，如果我在A和SaveAll的实例中更改了"someprop“，服务器将根本不会响应。甚至不调用updateData控件方法。如果我在将childB.Clear()传输到客户机之前清除它，一切都是正常的。

似乎结果是不能用集合更新实体？

Answer 1

如果您想要这样的场景工作，还有一些工作要做。结果仅在可观察的项目中翻转父实体。因此，只有类A的javascript表示是击倒可观察的，而类B的javascript表示不是。因此，Upshot不知道关联对象中的任何更改。

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，你可以看到一个手动映射的例子：http://bartjolling.blogspot.com/2012/04/building-single-page-apps-with-aspnet.html，所以我下面的例子是处理'delivery‘和'customer’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; }
    }
}

数据业务控制器

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。为了能够更新客户和交付，您需要定义一个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

添加一个包含客户端模型的新javascript文件。在这里，我显式地将每个属性转换为击倒可见对象。解决问题的关键是Customer对象的构造函数中的行，我在这里将传入的交付映射到一个可观察的数组中

/// <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);

视图

在初始化结论的index.cshtml中，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

导航到索引页时，将异步加载客户和相关交付的列表。所有的交付都是按客户分组的，并且预先固定了一个与交付的“IsDelivered”属性绑定的复选框。客户的名字也是可编辑的，因为它绑定到一个输入元素

我没有足够的声誉来发布截图，所以你将不得不没有一个截图

当现在选中或取消选中IsDelivered复选框时，DataService将检测到更改并将其发布到Upshot控制器

[{"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
    }
}]

修改客户名称时，当输入框失去焦点时，Upshot将提交更改

[{
    "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",
        "Address": "Address 2",
        "CustomerId": 2,
        "Latitude": 51.229248,
        "Longitude": 4.404831,
        "Name": "Rich Feynmann"
    }
}]

因此，如果您遵循上述步骤，Upshot将为您更新父实体和子实体。