當(dāng)我嘗試評估來自類別模型的數(shù)據(jù)時，我在 Laravel 中收到“試圖獲取非對象的屬性‘display_name’”錯誤。我有 2 個模型：Post 和 Category；我有相應(yīng)的表格：Posts('id', 'title', 'body', 'cover_image')和Categories('id', 'display_name','name', 'key).數(shù)據(jù)透視表是：category_post這是我的帖子模型：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'); }}這是我的類別模型：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，這是我的 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' => $posts]); } else { return view('pages.empty'); } }這是我的刀片文件：@if(count($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
TA貢獻1824條經(jīng)驗 獲得超8個贊
問題是你沒有在你的帖子表中保存CATEGORY_ID，保存好類別 ID 并嘗試這樣：
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');
}
}
類別模型
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 - 外鍵 category_id
Schema::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');
}
}
鴻蒙傳說
TA貢獻1865條經(jīng)驗 獲得超7個贊
我認為您post()在Category模型中的方法有誤。嘗試像這樣修改這個方法：
類別型號：
public function post()
{ return $this->hasMany('App\Post', 'id');}- 2 回答
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