product attributes in cart

[Tamade]

Hello
v1.7.1.1. classic
If I want it to show something if a product is in the cart, the following code works:

{$in_cart = 0}
          {foreach from=$cart['products'] item='cart_product'}
          {if $cart_product['id_product'] == $product.id}
          {$in_cart = 1}
          {/if}
          {/foreach}
          {if $in_cart}....{/if}

 

When I want to check the attributes, the following code does not work for me:

{$in_cart = 0}
          {foreach from=$cart['products'] item='cart_product'}
          {if $cart_product['????'] == $id_attribute}      
          {$in_cart = 1}
          {/if}
          {/foreach}
          {if $in_cart}....{/if}

How do I write to find the product attribute id for me?
Thanks

Edited June 28, 2021 by Tamade (see edit history)

[YoJoe]

I faced identical problem but haven't found any out of box solution.
Oh well, a man needs sometimes to roll up his own sleeves 😎
A bit of debugging to check what sort of data we can get from product object, and voilla.
Simple as it's possible. We just need to check if product id matches the one in cart along with its attribute, thus:
 

{if $cart_product['id_product'] == $product.id && $cart_product['id_product_attribute'] == $product.id_product_attribute}