Not only must you map objects into the database, you must also map the relationships that the object is involved with so they can be restored at a later date.

不仅必须将对象映射到数据库中，还必须将对象之间的关系进行映射，这样才能在以后进行恢复。

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This method also clears the submittedValue property of each EditableValueHolder component so the form's data can be restored to the data from the map, ignoring any submitted data.

此方法还清除了每个 EditableValueHolder 组件的 submittedValue 属性以便表单数据能恢复成地图数据，同时忽略所有的提交数据。

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The last selected camera is restored when you save the map and open it later.

当你保存地图然后再打开时会回到你最后选中的相机。

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