_req_user is undefined on pre/post remove hooks

The following middlewares output an undefined _req_user :

Article.schema.pre('remove', function reqUserDebug (next) {
    console.log('================ pre remove _req_user ================')
    console.log(this._req_user);
    return next();
});

Article.schema.post('remove', function reqUserDebug (next) {
    console.log('================ post remove _req_user ================')
    console.log(this._req_user);
    return next();
});

output:

================ pre remove hook _req_user ================
undefined
================ post remove hook _req_user ================
undefined

I do not know if it is useful but here is some background about my project regarding this issue:

I am developing a website with some role limitation on the back-office. I am using the _req_user on pre save hook to limit modifications. But without the _req_user on pre remove hook it is impossible to limit the remove rights.

[Nefil33]

Was there actually a solution for this? Sorry just looked around and all issues are closed but I still have this issue.

[r1b]

If you use update scripts, leveraging the updatedBy field will not work (it is unset in the context of an update script). I am now using @poksme 's solution.