Duplicate columns when using EmbeddedId with a ManyToOne mapping with Ebean

Question

I have a model called \"EventCheckin\" which has a ManyToOne mapping to an \"Event\" and a \"User\". The PrimaryKey of the \"EventCheckin\" table is the id of the user and the i

Answer 1

It looks like you try to do same thing via @MapsId and @EmbeddedId. One (working) option is to go for IdClass (equals, hashcode, extra attributes etc are cut away):

    @Entity
    public class User {
        @Id public String id;
    }

    @Entity
    public class Event {
        @Id public long id;
    }

    public class CheckinId implements Serializable {
        public Long event;
        public String user;
    }

    @Entity
    @IdClass(CheckinId.class)
    @Table(name="eventCheckin")
    public class EventCheckin {

        @Id
        @JoinColumn(name="user_id")
        @ManyToOne public User user;

        @Id
        @JoinColumn(name="event_id")
        @ManyToOne public Event event;
    }