更新页面的变化图像的名字按照视频id Laravel

我想改变形象的姓名按照视频id在Laravel项目。 如何解决这个?

这里是代码的控制器

$old_video = Video::find($id);

          //video thumbnail uploaded
          if ($request->hasFile('image_path') != '') {
            $video_themnull = $request->file('image_path');
            $video_themnull_name =  uniqid() . Str::random('10') . '.' . $video_themnull->getClientOriginalExtension();
            $video_themnull_resize = Image::make($video_themnull->getRealPath());
            $video_themnull_resize->resize(400, 200);

          if ($video_themnull->isValid()) {

              if (isset($old_video->image_path)) {
                  $files_old = $old_video->image_path;
                  if ( file_exists($files_old)) {
                      unlink($files_old);
                  }
              }

              $video_themnull_resize->save(public_path('video/themnull/' . $video_themnull_name));
              $image_path = 'public/video/themnull/' . $video_themnull_name;

          }
        }