众多的JPA标准规范

Question

I had entities Client and Agency with ManyToOne relation, so that table client had column agency_id pointing to table agency , also Client had:

@ManyToOne
@JoinColumn(name = "agency_id")
private Agency agency;

There were Spring Data JPA specification to select Client 's with Agency id's in:

public static Specification<Client> withAgencyIds(Collection<Long> agencyIds) {
    return (root, query, cb) -> root.join(Client_.agency).get(Agency_.id).in(agencyIds);
}

Now I have to change ManyToOne relation to ManyToMany relation, so that Client have:

@ManyToMany
@JoinTable(name = "client_agency",
           joinColumns = @JoinColumn(name = "client_id"),
           inverseJoinColumns = @JoinColumn(name = "agency_id"))
@OrderBy("name")
private List<Agency> agencies = new ArrayList<>();

How should I tune the specification above in order to select Client 's having Agency id's?

Thank you very much in advance!

Answer 1

This JPA Criteria specification works fine:

public static Specification<Client> withAgencyIds(Collection<Long> agencyIds) {
    return (root, query, cb) -> root.join(Client_.agencies).get(Agency_.id).in(agencyIds);
}