Rails 5 - Query records with a uniq attribute

I'm using Rails 5 and Postgresql. This question has been answered for previous versions of Rails (including Rails 4, using distinct, uniq, etc, but none of it worked for me with Rails 5 since they've been depreciated).

I have a Upload model, which has a uuid attribute. I want to fetch records having a different uuid without using uniq from enumerables.

Here is my original query:

Upload.includes(:user, product: [:catalog]).where(file_type: "product_attachment", product_id: nil, user_id: current_user.id))

I get errors when adding distinct or select (and it seems like those methods are often used to return only one attribut from the model while I need the whole object here).

Any idea on how to achieve this in Rails 5 ?

Edit with sample data:

Uploads:

id: 1 uuid: 8e8fece82b6b1368ab6f21852c625e85718d210eid: 2uuid: 842e7650b4bba97f097d9cf57f47d8160086b7cdid: 3uuid: 8e8fece82b6b1368ab6f21852c625e85718d210e

Uploads 1 and 3 have the same uuid, so the expected result would only contain the uploads with id 1 and 2 (which have a distinct uuid).