Question

亲爱的UI5专家！

我正面临OData v4模型的绑定问题。我有一个简单的OData结构，其中Persons被分配给Department，请参阅metadata.xml中的摘录：

... 
<EntityType Name="Person">
        <Key>
            <PropertyRef Name="Id"/>
        </Key>
        <Property Name="Id" Type="Edm.Int64"/>
        <Property Name="FirstName" Type="Edm.String"/>
        <Property Name="LastName" Type="Edm.String"/>
        <Property Name="Email" Type="Edm.String"/>
        <Property Name="Mobile" Type="Edm.String"/>
        <Property Name="Username" Type="Edm.String"/>
        <NavigationProperty Name="Department" Type="OData.WTS.Department" Partner="Person"/>
</EntityType>

<EntityType Name="Department">
        <Key>
            <PropertyRef Name="Id"/>
        </Key>
        <Property Name="Id" Type="Edm.Int64"/>
        <Property Name="Name" Type="Edm.String"/>
        <NavigationProperty Name="Person" Type="OData.WTS.Person" Partner="Department"/>
</EntityType>
...

现在我想构建一个UI5应用程序，让用户创建应该分配给部门的新人员（应该通过ValueHelp选择）。因此，我创建了一个列表页面，其项目绑定到模型：

<Table items="{ path: 'userService>/Persons', parameters : {$expand: 'Department'} }">
    ...
</Table>

部门本身受XML视图约束：

...
<form:FormElement>
    <form:label>
        <Label text="{i18n>User.Department}"/>
    </form:label>
    <form:fields>
        <Input id="Department"
               name="{userService>Department/Id}"
               value="{userService>Department/Name}"
               showValueHelp="true" valueHelpOnly="true"
               valueHelpRequest="onValueHelpRequestDepartment" />
    </form:fields>
</form:FormElement>
...

当用户按下＆＃34; New Person＆＃34;按钮，我通过OData v4 ListBindingContext创建一个新的瞬态模型 -

oListBindingContext
    .create({
            Id: null,
            Username: "",
            FirstName: "",
            LastName: "",
            Email: "",
            Mobile: "",
            Department: {
                Id : null,
                Name : null
            }
        }, function (oError) {
            // handle error
        }
    );

当用户现在通过ValueHelp选择部门时，我想为其分配ID并命名新创建的人员部门ID和名称。我尝试通过Input-control的setter-functions来完成这项工作，因为属性绑定到了部门：

// this should update the model-value
var oInput = this.getView().byId("Department");
oInput.setName(sSelectedId);
oInput.setValue(oSelectedBindingContext.getProperty("Name"));

但这会导致异常：

Failed to update path /Persons/-1/Department/Name - Error: /Persons/-1/Department/Name: No key predicate known at /Persons/-1/Department
    at error (http://localhost/ui5resources/sap/ui/model/odata/v4/ODataMetaModel-dbg.js?eval:1189:10)
    at eval (http://localhost/ui5resources/sap/ui/model/odata/v4/ODataMetaModel-dbg.js?eval:1297:7)
    at new SyncPromise (http://localhost/ui5resources/sap/ui/model/odata/v4/lib/_SyncPromise-dbg.js?eval:72:15)
    at SyncPromise.then (http://localhost/ui5resources/sap/ui/model/odata/v4/lib/_SyncPromise-dbg.js?eval:151:12)
    at eval (http://localhost/ui5resources/sap/ui/model/odata/v4/ODataMetaModel-dbg.js?eval:1288:47)

您是否有任何提示如何使用OData v4实现此简单方案？我在这里误解了OData v4概念吗？我正在使用OpenUI5版本1.50.6。

提前致谢:-) 的Mirco

在UI5 OData v4模型

0 个答案: