Laravel 获取上一条/下一条记录的例子

public function show($id)
{
 
    // get the current post
    $post = Post::find($id);
 
    // get previous post id
    $previous = Post::where('id', '<', $post->id)->max('id');
 
    // get next post id
    $next = Post::where('id', '>', $post->id)->min('id');
 
    return view('posts.show', compact('previous', 'next'));
}