CODEWITHSUNDEEP
javajpaormplayframework-2.1ebean
evanjdooner
evanjdooner

Reputation: 904

Relating an entity to multiple subclass entities as a single relationship to the superclass in JPA?

I'm building an application in Java with the Play 2 framework and ebean ORM.

I have an entity class Person that is related to several entity classes with the supertype Certificate, which is an abstract @MappedSuperclass. Currently, I'm creating a relationship for each subclass, like so:

public class `Person` extends Model {
    // elided...
    @OneToMany
    public List<SubType1> subType1s;

    @OneToMany
    List<SubType2> subType2s;
    // elided...
}

and the subclasses look like this:

public class SubTypeGeneric {
    // elided...
    @ManyToOne
    public Person person;
    // elided...
}

What I want to know is this: is it possible to group the subclass entities lists in Person together into a single superclass list, like so:

public class `Person` extends Model {
    // elided...
    @OneToMany
    public List<SuperType> superTypes;
    // elided...
}

Upvotes: 0

Views: 893

Answers (1)

JB Nizet
JB Nizet

Reputation: 691635

No, it's not possible. An association is between entities, not MappedSuperclasses. And if you have a OneToMany can be the inverse association of only one ManyToOne.

If you want that, then Certificate should be annotated with @Entity, and should contain the ManyToOne association with Person instead of all the subclasses.

Upvotes: 1

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