In Filter not working

[palexdev]

Hello, I have this model:

@Entity
public final class Article implements Comparable<Article> {
  private Feed feed;
  @Id
  private String link;
  // ...other fields and methods
}

@Entity
public final class Feed impements Comparable<Feed> {
  private String name;
  @Id
  private String link;
  
  // compareTo, equals and hashCode based on link field
}

When I remove some feeds from the database, I also need to remove any associated article. So, I do this:

public Collection<Feed> removeFeeds(Feed... feeds) {
  try (Session session = db.createSession()) {
    try (Transaction transaction = session.beginTransaction()) {
      // remove articles first
      ObjectRepository<Article> ar = transaction.getRepository(Article.class);
      ar.remove(where("feed").in(feeds));
      
      // remove feeds now
      transaction.commit();
      // collect removed feeds and return
    }
  }
}

The issue is that this line ar.remove(where("feed").in(feeds)); seems to do nothing. I did some debugging and I discovered that this if check is always skipped because the retrieved field is not an instance of Feed but a generic Document.
I don't get why though, I have the Jackson module loaded, I expect values to be serialized/deserialized when needed?

@anidotnet Am I missing something?

[anidotnet]

Actually you need to apply filter on a field with values like number or string. You can create filter like - where("feed.name").in(feedNames).

[palexdev]

Actually you need to apply filter on a field with values like number or string. You can create filter like - where("feed.name").in(feedNames).

So, I'd have to first convert my input to a collection of names/links.

But then what's the point of in(...) accepting an array of Comparables?
Is it just for wrapper types such as Strings, Number subtypes, etc?