Question

Helllo家伙我在laravel中使用多态关系。我正在做这样的事情。我在评论和帖子之间建立了多态关系。我面临的问题是，当我试图根据帖子或评论检索喜欢时，它会给我一个错误

未定义的属性：Illuminate \ Database \ Eloquent \ Collection :: $ likes

我无法理解我做错了什么。这是我的代码。请告诉我，我做错了什么

后置控制器

class PostController extends Controller
{
    //
    public function index($id=null){
    // if (is_null($id) || $id=''){
            $post = $this->dispatch(new ReadPostCommand());
            error_log(print_r($post->likes , true));
            $comment = array();
            foreach ($post as $key => $value) {
                // error_log(print_r($value->))

                $comment[$key] = $this->dispatch(new ReadCommentCommand($value["original"]["id"]));
                // error_log(print_r($comment[$key]->likes , true));
            }
            $id = '';
            $courses = $this->dispatch(new ReadCourseCommand("getAll"));
        // }else{
        //  $course = $this->dispatch(new ReadCourseCommand($id , "getById"));
        //  $post=$course->posts;
        //  $comment = array();
        //  foreach ($post as $key => $value) {
        //      $comment[$key] = $this->dispatch(new ReadCommentCommand($value["original"]["id"]));
        //  }

        // }
        // error_log(print_r($courses , true));
        return \View::make('post.index' , ['posts'=>$post , 'comments'=> $comment , 'courses'=>$courses , 'id'=>$id]);
    }
}

READ POST命令类

<?php

namespace App\Commands;

use App\Commands\Command;
use Illuminate\Contracts\Bus\SelfHandling;
use App\Exceptions\Custom\NotPermissionException;
use App\Exceptions\Custom\NameNotFound;
use App\Repositories\PostRepository;

class ReadPostCommand extends Command implements SelfHandling
{
    /**
     * @var
     */
    // private $action;
    // private $id;

    /**
     * Create a new command instance.
     *
     * @param $id
     */
    public function __construct()
    {
        // $id was in the parameter.
        // $this->id = $id;
        // $this->action = $action;
    }

    /**
     * Execute the command.
     *
     * @param TestRepository $TestRepository
     *
     * @return
     * @throws NotPermissionException
     * @throws NameNotFound
     * @internal param TestRepository $TestRepository
     */
    public function handle(PostRepository $PostRepository)
    {
        // if($this->action == "getAll"){
            $post = $PostRepository->getAll();
            return $post;
        // }else{
        //     $post = $PostRepository->getAllbyCourse();
        // }
    }
}

阅读后回复课程

<?php

namespace App\Repositories;

use App\PostModel;

class PostRepository
{
    public function create(PostModel $post)
    {
        $post->save();
    }
    public function getAll() {
        return PostModel::get();
    }

    public function getById($id){
        return PostModel::find($id);
    }
}

赞模特

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class LikeModel extends Model
{
    public $table = "likes";
    //
    public function likeable()
    {
      return $this->morphTo();
    }
}

发布模型

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use App\LikeModel;

class PostModel extends Model
{

    //
    public $table = "posts";

    public function likes()
    {

      return $this->morphMany('App\LikeModel', 'likeable');
    }

}

评论模型

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class CommentModel extends Model
{
    //
    public $table = "comments";

    public function likes()
    {
      return $this->morphMany('App\LikeModel', 'likeable');
    }
}

Answer 1

这是您的违规代码，位于PostController：

$post = $this->dispatch(new ReadPostCommand());
error_log(print_r($post->likes , true));

问题是，您的ReadPostCommand正在返回Collection个Post个对象。由于$post是Collection，因此当您尝试$post->likes时，您会收到您所看到的错误。 Collection没有$likes属性。您需要访问单个$likes对象的Post属性，而不是Collection。

向下几行，您使用$post迭代foreach集合。如果您将error_log移动到该循环中，它应该可以正常工作：

foreach ($post as $key => $value) {
    error_log(print_r($value->likes , true));

    // code...
}

未定义属性：Illuminate \ Database \ Eloquent \ Collection :: $ likes laravel

1 个答案: