JPA Criteria Builder build a predicate on a setAttribute

Question

I am new to using Criteria Builder for building dynamic queries.

I am trying to create a specification for my repository to find the DVD titles that contain a description like the search term.

I have a many to many join between dvds and dvd desciptions in my model.

In my DVD static metamodel class I have a

 public static volatile SetAttribute<DVD, DVDDescription> descriptions;

At the moment I am getting an error: "CriteriaBuilder is not applicable for the arguments"

 public Predicate toPredicate(Root<DVDs> root, CriteriaQuery<?>, CriteriaBuilder cb){

     return cb.like(searchTerm,root.get(DVD_.descriptions))

}

I know I am probably going about this the wrong way, but how do I use criteria builder for a setAttribute?

Answer 1

You need a Join:

public Predicate toPredicate(Root<DVDs> root, CriteriaQuery<?>, CriteriaBuilder cb){
    Join<DVD, DVDDescription> descriptionJoin = root.join(DVD_.descriptions);
    return cb.like(searchTerm,descriptionJoin.get(DVDDescription_.content));
}