我不確切知道這是如何工作的,所以這就是我要問的原因。我仍在製作一個公告牌系統,現在我想要在每個類別,子類別下。爲laravel中的foreach()提供的無效參數5.3
例如: https://laracasts.com/discuss/channels/eloquent/eloquent-getting-subcategories-from-the-categories
我已經使用上LaraCasts以下螺紋的做到了這一點
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\Thread;
use App\Chat;
use App\Category;
class IndexController extends Controller
{
/**
* Show the application dashboard.
*
* @return \Illuminate\Http\Response
*/
public function index()
{
$threads = Thread::all()->toArray();
$chats = Chat::orderBy('id', 'DESC')->take(50)->with('author')->get();
$categories = Category::with('sub_category')->get();
return view('index', compact('threads','chats','categories'));
}
}
這是我的分類型號:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Category extends Model
{
public function sub_category()
{
return $this->belongsTo(self::class, 'parent_id', 'id');
}
public function parent_category()
{
return $this->hasMany(self::class, 'id', 'parent_id');
}
}
我的觀點(index.blade.php):
@foreach($categories as $category)
<div class="col-md-8">
<div class="panel panel-primary">
<div class="panel-heading"><i class="fa fa-angle-right" aria-hidden="true"></i> {{ $category->caption }}</div>
<div class="panel-body">
@foreach($category->sub_category as $sub_category)
<div class="row forum-row">
<div class="col-xs-12 col-md-8 col-sm-8">
<div class="hidden-xs visible-sm visible-lg visible-md pull-left forum-icon-read">
<i class="fa fa-comment"></i>
</div>
<a href="#">{{ $sub_category->caption }}</a><br>
<small>{{ $sub_category->desc }}</small>
</div>
<div class="col-xs-12 col-md-4 col-sm-4 forum-latest-container">
<p class="forum-data cutoff"><a href="#">Test</a></p>
<small>
door <a class="Donateur" href="/user-Sygun">Sygun</a>
<p class="forum-data">
2 minuten geleden </p>
</small>
</div>
</div>
@endforeach
</div>
</div>
</div>
@endforeach
我也有兩個數據庫表:
- 行業標準(ID,標題,PARENT_ID,min_rank,DESC)
類別(id,caption,min_rank,desc)
該錯誤消息我得到:提供的foreach
無效的參數()
你能告訴我什麼是實現這一目標的正確方法嗎?
你在數據庫的「子類別」和「類別」中有兩個表嗎? –
是的,我有@AmitGupta – Sygun
'$ category-> sub_category'是一個數組嗎? (通過'var_dump($ category-> sub_category);'在內部循環之前驗證) - 也許你只是想循環'$ category'而不是? – Qirel