Product tags empty on product page. (ObjectPresenter and multidimensional attribute)

[lusimeon]

Describe the bug

Product tags are empty when using ObjectPresenter (Product page for example).

This is due to a non-recursive loop in ObjectPresenter. Traversable attributes aren't successfully transformed.

I've tested it on 1.7.6.4 Prestashop version but I think it's still relevant in the latest version.

Expected behavior

An array of tags

Steps to Reproduce

Steps to reproduce the behavior:

1. Dump $product.tags on web/themes/foo/templates/catalog/product.tpl
2. Go on product page

Additional information

• PrestaShop version: 1.7.6.4

[hibatallahAouadni]

Hello @lusimeon

Go on product page

In this step, I beleive you didn't see any tags, is that so?
Cause I tried and no tags are displayed, I add this code below in PrestaShop/themes/classic/templates/catalog/product.tpl
(I add it between the product_add_to_cart block and the product_additional_info block

<div>
   <p>Hello world!</p>
   <ul>
      {foreach from=$product.tags item=tag}
         <li>{$tag}</li>
      {/foreach}
   </ul>
</div>

And all I can see is the Hello world text, see screenshot below:

Well, we need a developer to explain this behavior. Ping @PrestaShop/prestashop-core-developers wdyt?

[PierreRambaud]

I manage to reproduce the issue
Currently, the ObjectPresenter is only fetching for database definitions, and because of relations between tables, only products information (related to ps_product) are fetched inside the Presenter.
I don't know if it's the desired behavior, it looks more than a bug.