Hi Gail, I would not consider it a bug to not have documented that we don't support some non-mandatory feature.
And it's still optional in JPA 2.2, so I think we're good. Thanks, Sanne On 30 May 2018 at 19:45, Gail Badner <gbad...@redhat.com> wrote: > Hi Vlad, > > Thanks for your answer. There are definitely better ways to model this > association. > > WRT the second example, where the referenced columns are a subset of the PK > columns -- I understand there are better ways to model this. > > In particular, since the subset of PK columns needs to be unique (since > they are the referenced columns of a @JoinColumn), there is no reason for > any other columns to be in the PK. > > My question is more about what the JPA spec says about whether this should > be supported. > > Regards, > Gail > > > > > > On Wed, May 30, 2018 at 12:47 AM, Vlad Mihalcea <mihalcea.v...@gmail.com> > wrote: > >> Hi, >> >> For the OneToMany with @JoinColumn, the user can workaround this >> limitation by just using the @ManyToOne on the child side on any column >> they want >> and turning the unidirectional association into a bidirectional one. I >> remember I tested it and it worked just fine. >> >> For the OneToMany with @JoinTable, the only workaround would be if they >> map the join table as an entity and use the @ManyToOne on the columns they >> want >> the association to be based on. >> >> Since unidirectional associations don't perform that well, I'm not sure >> whether it's worth adding support for these use cases. >> >> Vlad >> >> On Wed, May 30, 2018 at 9:32 AM, Gail Badner <gbad...@redhat.com> wrote: >> >>> Unidirectional OneToMany associations using @JoinColumn that reference >>> columns that are not PK columns is not currently supported. >>> >>> The JPA 2.1 documentation for @JoinTable says: >>> >>> "Support for referenced columns that are not primary key columns of the >>> referenced table is optional. Applications that use such mappings will not >>> be portable." >>> >>> I don't see anything in the user doc that explicitly states that Hibernate >>> does not support this. >>> >>> Is this considered a bug? >>> >>> Also, what about a unidirectional OneToMany using a @JoinColumn that >>> references some, but not all, of primary key columns? Hibernate does not >>> support that either. Should Hibernate support it since they are primary >>> key >>> columns? >>> >>> Thanks, >>> Gail >>> _______________________________________________ >>> hibernate-dev mailing list >>> hibernate-dev@lists.jboss.org >>> https://lists.jboss.org/mailman/listinfo/hibernate-dev >>> >> >> > _______________________________________________ > hibernate-dev mailing list > hibernate-dev@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/hibernate-dev _______________________________________________ hibernate-dev mailing list hibernate-dev@lists.jboss.org https://lists.jboss.org/mailman/listinfo/hibernate-dev
