Question

所以我使用的是MVC4应用程序模板。我已经定义了一个非常简单的代码第一个数据模型来说明我的问题。我正在使用Breeze提供我的数据，我正在使用Knockout将数据绑定到页面。

这是我的订单表：

public class Order
{
    [Key]
    public long Id { get; set; }
    public string Customer { get; set; }
    [ForeignKey("OrderId")]
    public virtual ICollection<Line> Lines { get; set; }
}

这是我的行表：

public class Line
{
    [Key]
    public long Id { get; set; }
    public long OrderId { get; set; }
    public string Description { get; set; }
}

然后我按如下方式填充我的数据库：

Insert into Orders(Customer) values ('Customer 1');
Insert into Orders(Customer) values ('Customer 2');
Insert into Orders(Customer) values ('Customer 3');
Insert into Lines (OrderId, Description) values (1,'Customer 1 Line 1');
Insert into Lines (OrderId, Description) values (1,'Customer 1 Line 2');
Insert into Lines (OrderId, Description) values (1,'Customer 1 Line 3');
Insert into Lines (OrderId, Description) values (2,'Customer 2 Line 1');
Insert into Lines (OrderId, Description) values (2,'Customer 2 Line 2');
Insert into Lines (OrderId, Description) values (2,'Customer 2 Line 3');
Insert into Lines (OrderId, Description) values (3,'Customer 3 Line 1');
Insert into Lines (OrderId, Description) values (3,'Customer 3 Line 2');
Insert into Lines (OrderId, Description) values (3,'Customer 3 Line 3');

所以基本上每个订单都有3条细节线。

然后在我的索引视图中，我执行以下操作：

@section scripts {
<script>
    $(function () {
        var manager = new breeze.EntityManager('breeze/breeze');

        var query = new breeze.EntityQuery()
            .from("Orders").expand("Lines");

        manager.executeQuery(query).then(function (data) {
            ko.applyBindings(data);
        }).fail(function (e) {
            alert(e);
        });
    });
</script>
}
<h2>Orders</h2>

<!-- ko foreach: results -->  
        <br /><label data-bind="text: Customer"></label>      
         <!-- ko foreach: Lines -->                
             <label data-bind="text: Description"></label>                
         <!-- /ko -->
<!-- /ko -->

我期望看到的是：

Customer 1
Customer 1 Line 1
Customer 1 Line 2
Customer 1 Line 3

Customer 2
Customer 2 Line 1
Customer 2 Line 2
Customer 2 Line 3

Customer 3
Customer 3 Line 1
Customer 3 Line 2
Customer 3 Line 3

但我得到的是：

Customer 1  
Customer 1 Line 1

Customer 2   
Customer 1 Line 2

Customer 3   
Customer 1 Line 3

因此，它似乎将Order表Id字段链接到Line表Id字段而不是OrderId字段，这是正确的外键字段。

我不确定这是一个轻微的问题，实体框架问题还是淘汰赛问题。

如果我查看Chrome开发人员工具中从Orders Breeze Controller返回的数据，它似乎正在发回正确的数据：

0: {$id:1, $type:BreezeSample.Order, BreezeSample, Id:1, Customer:Customer 1,…}
$id: "1"
$type: "BreezeSample.Order, BreezeSample"
Customer: "Customer 1"
Id: 1
Lines: [{$id:2, $type:BreezeSample.Line, BreezeSample, Id:1, OrderId:1, Description:Customer 1 Line 1},…]
0: {$id:2, $type:BreezeSample.Line, BreezeSample, Id:1, OrderId:1, Description:Customer 1 Line 1}
1: {$id:3, $type:BreezeSample.Line, BreezeSample, Id:2, OrderId:1, Description:Customer 1 Line 2}
2: {$id:4, $type:BreezeSample.Line, BreezeSample, Id:3, OrderId:1, Description:Customer 1 Line 3}
1: {$id:5, $type:BreezeSample.Order, BreezeSample, Id:2, Customer:Customer 2,…}
$id: "5"
$type: "BreezeSample.Order, BreezeSample"
Customer: "Customer 2"
Id: 2
Lines: [{$id:6, $type:BreezeSample.Line, BreezeSample, Id:4, OrderId:2, Description:Customer 2 Line 1},…]
0: {$id:6, $type:BreezeSample.Line, BreezeSample, Id:4, OrderId:2, Description:Customer 2 Line 1}
1: {$id:7, $type:BreezeSample.Line, BreezeSample, Id:5, OrderId:2, Description:Customer 2 Line 2}
2: {$id:8, $type:BreezeSample.Line, BreezeSample, Id:6, OrderId:2, Description:Customer 2 Line 3}
2: {$id:9, $type:BreezeSample.Order, BreezeSample, Id:3, Customer:Customer 3,…}
$id: "9"
$type: "BreezeSample.Order, BreezeSample"
Customer: "Customer 3"
Id: 3
Lines: [{$id:10, $type:BreezeSample.Line, BreezeSample, Id:7, OrderId:3, Description:Customer 3 Line 1},…]
0: {$id:10, $type:BreezeSample.Line, BreezeSample, Id:7, OrderId:3, Description:Customer 3 Line 1}
1: {$id:11, $type:BreezeSample.Line, BreezeSample, Id:8, OrderId:3, Description:Customer 3 Line 2}
2: {$id:12, $type:BreezeSample.Line, BreezeSample, Id:9, OrderId:3, Description:Customer 3 Line 3}

哪一项看起来都是正确的，所以我不确定真正的问题在哪里。

任何人都可以提供任何帮助将不胜感激。谢谢！

Answer 1

我认为您展示的EF模型是您没有建立稳固关系的原因。你有一系列的行，但是没有地图回到订单？

public class Order
{
    [Key]
    public int Id { get; set; }
    public string Customer { get; set; }
    [ForeignKey("OrderId")]
    public virtual ICollection<Line> Lines { get; set; }
}

这是我的行表类：

public class Line
{
    [Key]
    public int Id { get; set; }
    public int OrderId { get; set; }
    public string Description { get; set; }

    public virtual Order Order { get; set; }
}

另外，你正在使用long我认为你的意思是使用int的

Breeze扩展子记录似乎没有使用正确的外键

1 个答案: