Order Items can't display in purchase order view in Laravel - laravel

Question

Hi need your help please. I can't make the order items display in order view. I am using the belongsToMany relation.
Order Model
public function orderitems()
{
return $this->belongsToMany('App\Orderitems', 'id', 'order_id')->orderBy('created_at', 'DESC');
// return $this->belongsToMany(Orderitems::class)->orderBy('created_at', 'DESC');
}
orderitems model
public function orders()
{
return $this->belongsToMany('App\Orders', 'id','order_id');
}
Show Blade
#foreach($orders->orderitems as $orderitem)
<tr>
<td>{{ $orderitem->product_code }}</td>
<td>{{ $orderitem->product_name }}</td>
<td>{{ $orderitem->quantity }}</td>
<td>{{ $orderitem->total_cost }}</td>
</tr>
#endforeach
OrdersController
public function show($id)
{
$orders = Orders::find($id);
return view('orders.show')->with('orders', $orders);
}
hope you can help me. thank you so much in advance!
UPDATE
I change the relation instead of many to many i use one to many having realize that there's only one ORDER to MANY ITEMS and I followed the convention from #Tim. here's now what my models and controller's look like
orders model
public function orderItems()
{
return $this->hasMany('App\Orderitems', 'id', 'order_id')->orderBy('created_at', 'DESC');
}
orderitems model
public function orders()
{
return $this->belongsTo('App\Orders','id','order_id');
}
controller
public function show($id)
{
$order = Orders::find($id);
$orderItems = $order->orderItems;
dd($order->orderitems);
Log::info($order);
var_dump($order);
}
the result of dd is empty

Answer 1

When using many-to-many belongsToMany, in Order model you need
1- Orderitems Class
2- many-to-many table name
3- Order ID (Parent)
4- Orderitems ID (Children in this many case)
But as you've switched to 1-to-many hasMany you need only the Foreign Key. Use in Orders model :
<?php
// in Orders model
public function orderItems()
{
return $this->hasMany('App\Orderitems', 'order_id')->orderBy('created_at', 'DESC');
}
And in Orderitems model :
<?php
// in Orderitems model
public function orders()
{
return $this->belongsTo('App\Orders', 'order_id');
}