Laravel-5.8：试图获取非对象的属性“display_name”
当我尝试评估来自类别模型的数据时，我在 Laravel 中收到“试图获取非对象的属性‘display_name’”错误。
我有 2 个模型：Post 和 Category；我有相应的表格：
Posts('id', 'title', 'body', 'cover_image')
和
Categories('id', 'display_name','name', 'key).
数据透视表是：category_post
这是我的帖子模型：
namespace App;
use Illuminate\Database\Eloquent\Model;
class Post extends Model
{
//Table Name
protected $table = 'posts';
//Model Relationships
public function tag(){
return $this->belongsToMany('App\Tag', 'id');
}
public function category() {
return $this->belongsTo('App\Category','id');
}
}
这是我的类别模型：
namespace App;
use Illuminate\Database\Eloquent\Model;
class Category extends Model
{
protected $table = 'categories';
//Model Relationships
public function post()
{
return $this->belongsTo('App\Post', 'id');
}
}
另外，这是我的 PagesController：
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\Post;
class PagesController extends Controller
{
public function index()
{
if ( !is_null(Post::class) ) {
$posts = Post::latest()->with('category')->paginate(5);
return view('pages.index')->with(['posts' => $posts]);
}
else {
return view('pages.empty');
}
}
这是我的刀片文件：
@if(count($posts) > 0)
@foreach($posts as $post)
<span> <i class="fa fa-folder-open"></i> {{ $post->category->display_name }} </span>
@endforeach
@endif
2回答
-
有只小跳蛙
问题是你没有在你的帖子表中保存CATEGORY_ID，保存好类别 ID 并尝试这样：更新 POST 模型：namespace App;use Illuminate\Database\Eloquent\Model;class Post extends Model{ //Table Name protected $table = 'posts'; // Setup fields of table "posts" protected $fillable = ['id', 'title', 'body', 'cover_image','category_id']; //Model Relationships public function tag(){ return $this->belongsToMany('App\Tag', 'id'); } // Relation category to foreign key public function category() { return $this->belongsTo('App\Category','category_id'); }}类别模型namespace App;use Illuminate\Database\Eloquent\Model;class Category extends Model{ protected $table = 'categories'; // Setup fields of table "category" protected $fillable = ['id', 'display_name', 'name', 'key']; //Model Relationships public function posts() { return $this->hasMany('App\Post'); }}看法@if(count($posts) > 0) @foreach($posts as $post) <span> <i class="fa fa-folder-open"></i> {{ $post->category->display_name }} </span> @endforeach@endif移民帖 - 外键 category_idSchema::create('posts', function (Blueprint $table) { // Your other fields..... // You must setup category like this $table->integer('category_id')->nullable()->unsigned(); $table->foreign('category_id')->references('id')->on('categories')->onUpdate('cascade')->onDelete('cascade'); });控制器namespace App\Http\Controllers;use Illuminate\Http\Request;use App\Post;class PagesController extends Controller{ public function index() { $posts = Post::all(); if (!empty($posts)) { // Please let me know this test dd($posts[0]->category->display_name); return view('pages.index', ['posts' => $posts]); } else { return view('pages.empty'); } }00 -
鸿蒙传说
我认为您post()在Category模型中的方法有误。尝试像这样修改这个方法：类别型号：public function post() { return $this->hasMany('App\Post', 'id');}来源：Eloquent-relationship 一对多00