laravel模型关联评论

用户模型

public function show(Post $post,LogManager $log)
{
   $post->load("comments"); //这种方式是预加载 ，如果没有这句，就是下面在模板加载的时候才进行模型查询
   return view("post.show",compact('post'));
}

post模型

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    //

   protected $table = "posts";
   public $primaryKey = 'id';

   public function user()
   {
      return $this->belongsTo("App\Models\User","user_id",'id');
   }

   public function comments()
   {
      return $this->hasMany('App\Models\Comment','post_id','id')->orderBy("created_at",'desc');
   }
}

comment模型

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Comment extends Model
{

   protected $table = 'comments';

   public $primaryKey = 'id';

   public function post()
   {
      return $this->belongsTo("App\Models\Post",'post_id','id');
   }

   public function user()
   {
      return $this->belongsTo("App\Models\User",'user_id','id');
   }
}

最后 文章模型 想获取评论和评论用户 
查找到post对象 

@if(!empty($post->comments))
    @foreach($post->comments as $item)
        <ul class="list-group" style="padding-bottom:10px;">
            <li class="list-group-item">
                <h5>{{ $post->created_at }} by {{ $item->user->name }}</h5>
                <div>
                    {{ $item->content }}
                </div>
            </li>
        </ul>
    @endforeach
    @endif