如何在"之前保存"云函数中取消设置嵌套属性?

Question

我扩展了一个Parse.Object.现在我想在保存对象之前取消设置嵌套属性。此嵌套属性settings是一个对象。

所以我的钩子看起来像这样：

Parse.Cloud.beforeSave('MyObject', req => {
if (req.object.get('settings').propertyToUnset) {
req.object.unset('settings.propertyToUnset');
}
});

但是，这会产生错误Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client

unset如何用于嵌套属性？

Answer 1

你可以尝试这样的事情：

Parse.Cloud.beforeSave('MyObject', async req => {
const settings = req.object.get('settings');
await settings.fetch();
if (settings.get('propertyToUnset')) {
settings.unset('propertyToUnset');
await settings.save();
}
});

Answer 2

解决方案是使用普通的JavaScript命令delete删除嵌套对象的属性settings：

Parse.Cloud.beforeSave('MyObject', req => {
if (req.object.get('settings').propertyToUnset) {
delete req.object.get('settings').propertyToUnset;
}
});