Laravel: Property [user] does not exist on this collection instance - laravel

Question

In Laravel, I've Orders model where each order belongs to only one user,
I want to return only user names and orders ids when I fetch the orders, So in my OrdersController I've this function
public function getAllOrders()
{
$orders = Order::all();
return new OrderResource($orders);
}
and in my OrderResource I've
public function toArray($request)
{
return [
'user' => $this->user,
'id' => $this->id,
];
}
I'm getting an error saying Property [user] does not exist on this collection instance.
I think the reason is coming from the fact that $orders is a collection and I should loop through it and get for each order get the user associated with it, but I've no idea how to do that.
Note: I'm using oneToMany and belongsTo on Users and Orders Model. so orders table doesn't have a user column, I want to get the user from the relationship.

Answer 1

When using a collection use like this;
public function getAllOrders()
{
return OrderResource::collection(Order::all());
}
When using a model use like this;
public function getOrder($id)
{
return new OrderResource(Order::find($id));
}
More information in the documentation: https://laravel.com/docs/7.x/eloquent-resources#concept-overview
Note: To avoid N+1 queries, you should get your orders like this; Order::with('user')->get(); instead of Order::all()
The difference is that Order::with('user')->get(); will perform two queries.
select * from orders
select * from users where id in (?, ?, ?, ?, ...)
Whereas Order::all() will perform N+1 queries (N = number of orders)
select * from orders
select * from users where id = ?
select * from users where id = ?
select * from users where id = ?
... and so on