save model angular contain forgein key

I can't get user_id (forgien key) value into my history table. I have 3 tables here ; (users, questions,history) If the user answer the question I should store his answer on the history table

how can I get user_ID from angularJS file Historycontroller.php

    public function index(Request $request)
    {
           $historiques = History::all();
           return $historiques;

    }

Thanks!