使用 withCount() 计算子关系记录

使用withCount（）计算子关系记录

如果您有hasMany（）关系，并且您想计算“子”条目，则不要编写特殊的查询。例如，如果您在User模型上有帖子和评论，请使用Count（）编写以下内容：

public function index(){    
$users = User::withCount(['posts', 'comments'])->get(); 
return view('users', compact('users'));
}

And then, in your Blade file, you will access those number with {relationship}_count properties:

@foreach ($users as $user)
<tr>    <td>{{ $user->name }}</td>  
<td class="text-center">{{ $user->posts_count }}</td> 
<td class="text-center">{{ $user->comments_count }}</td></tr>
@endforeach

You may also order by that field:

User::withCount('comments')->orderBy('comments_count', 'desc')->get();