laravel 带条件的分页查询

<?php

class IndexController extends Controller
{
    public function index(Request $request){
        $course_id = $request->input("course_id");
        $list = CourseInfo::where('course_id',$course_id)->orderBy("sort","desc");
        $list = $list->paginate(ConstantUtil::PAGE_SHOW);
        
        //分页处理
        $page = isset($page)?$request['page']:1;
        $list = $list->appends(array(
            'course_id'=>$course_id,
            'page'=>$page
        ));
        return view('Admin/index/index',['list' => $list,'course_id'=>$course_id]);
    }
}

?>

HTML页面

<div class="dw-page"> {!! $list->links() !!} </div>