php - 拉拉维尔 5.7 错误 : Call to a member function save() on null

Question

我正在使用 Laravel 框架 5.7.25
我正在尝试创建已登录的当前用户的帖子。
但我面临这些错误:

Call to a member function save() on null this is Error: this is my PostController :

<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\Post;

class PostController extends Controller
{
    public function postCreatePost(Request $request)
    {
        $post = new Post();
        $post->body=$request['body'];
        $request->user()->posts()->save($post);
        return redirect()->route('dashboard');
    }
}

这是 Post 模型

<?php
namespace App;
use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    public function user()
    {
        $this->belongsTo('App\User');
    }
}

这是用户模型

<?php
namespace App;
use Illuminate\Contracts\Auth\Authenticatable;
use Illuminate\Database\Eloquent\Model;

class User extends Model implements Authenticatable
{
 use \Illuminate\Auth\Authenticatable;
  public function posts()
  {
      $this->hasMany('App\Post');
  }
}

Answer 1

您的 user() 和 posts() 关系未返回任何内容:

public function posts() {
    $this->hasMany('App\Post');
}

需要成为:

public function posts() {
    return $this->hasMany('App\Post');
}

并对 user() 进行了同样的调整。