Дмитрий Кулик

public function handle($request, Closure $next)
    {
        if ($this->guard->guest()) {
            if ($request->ajax() || $request->wantsJson()) {
                return response('Unauthorized.', 401);
            } else {
                return redirect()->guest(URL::route('auth'));
            }
        }
}

public function on($first, $operator, $second, $boolean = 'and', $where = false) {}

DB::table('user')->leftJoin('payments', function($join) {
            $join->on('entity_type', '=', 'salary', 'and', true)
                 ->on('entity_id', '=', 'user.id')
        })->get()