启用选择时，DataModel 必须实现 org.primefaces.model.SelectableDataModel，但我已经定义了 rowKey [英] DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled, but I have already defined rowKey

问题描述

我有一个可选的 PrimeFaces 3.4.1 数据表:

I've a selectable PrimeFaces 3.4.1 datatable:

<p:dataTable value="#{projectAdminisrationMB.selectedUserMemberOfGroups}" var="group1" 
    rowKey="#{group1.name}" selectionMode="single" selection="#{projectAdminisrationMB.selectedBelongToGroup}">
    ...
</p:dataTable>

我收到此错误:

com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback 访问严重:javax.faces.FacesException:启用选择时，DataModel 必须实现 org.primefaces.model.SelectableDataModel.

com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback visit Grave: javax.faces.FacesException: DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled.

但我已经按照 FacesException:启用选择时，DataModel 必须实现 org.primefaces.model.SelectableDataModel.这是怎么引起的，我该如何解决?

But I have already set rowKey as per FacesException: DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled. How is this caused and how can I solve it?

推荐答案

当 rowKey 属性中的 EL 表达式计算结果为 null 时，可能会发生这种情况.

This can occur when the EL expression in the rowKey attribute ever evaluates null.

确保您的 Group 实例的 name 属性为never null.否则最好使用表示自动生成的数据库主键的属性，例如 #{group1.id} —如果你有的话.

Make sure that the name property of your Group instance is never null. Otherwise better use a property representing the autogenerated DB primary key, such as #{group1.id} — if you have one.

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