Can't get commentator name in Laravel 5.4, why?

Question

Laravel

Hello! Tell me please. Unable to get commentator name.

Relationship method must return an object of type Illuminate\Database\Eloquent\Relations\Relation 

ErrorException in HasAttributes.php line 403:
Relationship method must return an object of type Illuminate\Database\Eloquent\Relations\Relation (View: D:\OpenServer\domains\photograph.loc\resources\views\posts\post.blade.php)

This line is: {{$comment->user->name}}. It is after interacting with comments->user that an error is displayed.
post.blade.php

@extends('layout')

  @section ('content')
  <article class="post">
    <span>Статью написал: {{$post->user->name}}</span></br>
    <time>{{$post->created_at->toFormattedDateString()}}</time>
    <h1>{{$post->title}}</h1>
    <div class="content">
      {{$post->body}}
    </div>
    @if (count($post->comments))
    <div class="comments">
      <h3>Комментарии</h3>
      <ul class="list-group">

        @foreach ($post->comments as $comment)
          <li class="list-group-item">
            <span class="date">Комментарий оставлен {{$comment->user->name}} в {{$comment->created_at->diffForHumans()}}</span>
            <div class="body-comment">{{$comment->body}}</div>
          </li>
        @endforeach
      </ul>
      <hr>
    @endif
    @if (Auth::check())
      <div class="card">
        <div class="card-block">
          <form method="post" action="/posts/{{$post->id}}/comments">
            {{csrf_field()}}
            <div class="form-group">
              <textarea name="body" placeholder="Ваш комментарий" class="form-control"></textarea>
            </div>
            <button type="submit" class="btn btn-inverse">Опубликовать</button>
          </form>
        </div>
      </div>
    @else
    <div class="card">
      <div class="card-block">
        <span>Вы не можете оставлять комментарии.</span>
      </div>
    </div>
    @endif
  </div>
  </article>
  @endsection

routes/web.php

Route::get('/posts/{post}', '[email protected]');

PostsController.php

public function show(Post $post)
{
  return view('posts.post', compact('post'));
}

Comment.php

<?php

namespace Photo;

use Illuminate\Database\Eloquent\Model;

class Comment extends Model
{
    protected $fillable = ['body', 'user_id', 'post_id'];


    public function user()
    {
      $this->belongsTo(User::class);
    }
    public function post()
    {
      $this->belongsTo(Post::class);
    }
}

user.php

<?php

namespace Photo;

use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    use Notifiable;

    protected $fillable = [
        'name', 'email', 'password',
    ];
    protected $hidden = [
        'password', 'remember_token',
    ];

    public function posts()
    {
      return $this->hasMany(Post::class);
    }

    public function comments()
    {
      return $this->hasMany(Comment::class);
    }

    public function publish(Post $post)
    {
      $this->posts()->save($post);
    }
}

post.php

<?php

namespace Photo;

use Illuminate\Database\Eloquent\Model;
use Carbon\Carbon;

class Post extends Model
{
    protected $guarded = [];

    public function user()
    {
      return $this->belongsTo(User::class);
    }

    public function comments()
    {
      return $this->hasMany(Comment::class);
    }

    public function scopeFilter($query, $filters)
    {
      if ($month = $filters['month']){
        $query->whereMonth('created_at', Carbon::parse($month)->month);
      }

      if ($year = $filters['year']){
        $query->whereYear('created_at', $year);
      }
    }

    public static function archives()
    {
      return static::selectRaw('year(created_at) year, monthname(created_at) month, count(*) published')
      ->groupBy('year', 'month')
      ->orderByRaw('min(created_at) desc')
      ->get()
      ->toArray();
    }
}