beforeSave 不修改 request.object

Question

I'm trying to add some additional attributes for new user through cloud code:

Parse.Cloud.beforeSave(Parse.User, (request) => {
    if (!request.original) {
        // New user
        Parse.Config.get()
            .then((config) => {
                const ProfileIcon = Parse.Object.extend("ProfileIcon");
                const iconId = config.get("defaultProfileIcon");
                const user = request.object;
                // ...many user.set
                user.set("profileIcon", ProfileIcon.createWithoutData(iconId), {
                    useMasterKey: true,
                }); // Pointer
                // This will save as expected, but cause recursion
                // user.save({ useMasterKey: true });
            })
            .catch((err) => {
                console.error(err);
            });
    }
});

The code above triggered and executed without any error, but when I check the database, none of my custom attributes show up. Passing the master key also does nothing. How can I fix this?
Or is it because the request from the client (Android, have no access to master key), if so then how can I set master key for the request, since Parse.Cloud.useMasterKey() is deprecated?

Answer 1

Here, modifying object on save does not mention anything about return , but before save file does. So I thought I would give it a try, turns out it worked. Still not sure if this is the right way though.