Fetch all products from more orders

You also will need a many-to-many relationship between Order and Product assuming a Product can be ordered more than once. This will require a pivot table order_product with product_id and order_id columns by convention. Then the Order model:

// Order

public function products()
{
    return $this->belongsToMany(Product::class);
}

// User
public function products()
{
    return $this->hasMany(Order::class);
}

Once the relationship has been properly established:

$user = User::with('orders.products')->get()

Thank you ! Works