public function update($id, PromotionRequest $request)
    {
        $promotion = $this->repository->find($id);

        if (empty($promotion)) {
            Cms::notification('Promotions not found', 'warning');

            return redirect(route($this->routeBase.'.promotions.index'));
        }

        $promotion = $this->repository->update($promotion, $request->all());

        Cms::notification('Promotions updated successfully.', 'success');

        return redirect(url()->previous());
    }