Make product buyable only once - php

Question

Hello guys i trying to make product can be buyable only once so i make that
productsTable: id,name,desc,price,onlyOnce(Boolean 0-1)
And i make pivot table too: orders: user_id,product_id
I try this code:
public function showProducts(Category $category, User $user) {
$products = $category->products()->where('onlyOnce', 1)->pluck('id')->toArray();
$userOrders = $user->orders()->pluck('user_Id')->toArray();
$missProducts = array_intersect($userOrders, $products);
$extras = $category->products()->whereNotIn('id', $missProducts)->get();
return view('products.category',compact('extras'));
}
But not work, some ideas how to do that?
(If you need here is my models)
Product.php
class Product extends Model
{
protected $fillable = [];
/**
* #return \Illuminate\Database\Eloquent\Relations\BelongsTo
*/
public function categories() {
return $this->belongsToMany(Category::class);
}
/**
* #return \Illuminate\Database\Eloquent\Relations\HasMany
*/
public function orders(){
return $this->hasMany(Order::class);
}
}
Order.php
class Order extends Model
{
/**
* #return \Illuminate\Database\Eloquent\Relations\BelongsTo
*/
public function user()
{
return $this->belongsTo(User::class);
}
/**
* #return \Illuminate\Database\Eloquent\Relations\BelongsTo
*/
public function product(){
return $this->belongsTo(Product::class);
}
/**
* #return int
*/
public function getTotalPrice() {
$orders = self::with('product')->get();
$total = $orders->pluck('product')->sum('price');
return $total;
}
}
User.php
class User extends Authenticatable
{
/**
* The attributes that are mass assignable.
*
* #var array
*/
protected $fillable = ['name'];
/**
* #return \Illuminate\Database\Eloquent\Relations\HasMany
*/
public function orders()
{
return $this->hasMany(Order::class);
}
}
With that code it return empty array i don't know why, so please if you have some ideas how i can fix that or what new code to type answear! Thanks in advice, peace! ;)

Answer 1

You set up your database kind of weird, I would have done it differently, however the following code should retrieve all the products not purchased by a user. Let me know if it works.
$productID = 123;
$userID = 10;
$purchased = $orders->select('product_id')->where('user_id', $userID)->toArray();
$notPurchased = $productsTable->whereNotIn('id',$purchased)->get();
You could then pass $notPurchased to a view, and loop over it with a foreach() loop to get each unpurchased product id.