Check out example codes for "show user only those products which he hasn't buyed laravel eloquent". It will help you in understanding the concepts better.

Code Example 1

$user_id = auth()->user()->id;

Product::where('status', 'active')
  ->whereNotIn('id', function($query) use ($user_id) {
    $query->select('product_id')->from((new OrderProduct)->getTable())
      ->where('user_id', $user_id)->where('status', 'delivered')
		->pluck('product_id')->toArray();
  });

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