MappedSuperclass maps all child entities to one child

Asked Feb 28 '19 at 09:00

Active Feb 28 '19 at 11:19

Viewed 102 times

I have the TranslationBase base abstract class, and tow subclasses[entities] : CountryTranslation and RegionTranslation as shown below :

TranslationBase:

@MappedSuperclass
@IdClass(TranslationBasePK.class)
public abstract class TranslationBase<T> implements Serializable {

    @Id
    @ManyToOne
    @JoinColumn(name = "id")
    private T ownerEntity;

    @Id
    @JsonProperty(access = JsonProperty.Access.WRITE_ONLY)
    @Column(name = "language_id")
    private Long languageId;

    private String name;
}

CountryTranslation :

@Entity
@Table(name = "country_translation")
public class CountryTranslation extends TranslationBase<Country> {
}

RegionTranslation :

@Entity
@Table(name = "region_translation")
public class RegionTranslation extends TranslationBase<Region> {
}

And TranslationBasePK :

public class TranslationBasePK implements Serializable {

    private Long ownerEntity;

    private Long languageId;
}

On DB i found the id column in CountryTranslation and RegionTranslation tables reference to Country table id !!

I expect CountryTranslation to reference the id of Country and RegionTranslation to reference the id of Region class.

Note : Country and Region have @Id feild named id;

edited Feb 28 '19 at 11:19

asked Feb 28 '19 at 09:00

Mohammad Makahleh

How does TranslationBasePK look like? – Simon Martinelli Feb 28 '19 at 09:35
public class TranslationBasePK implements Serializable { private Long ownerEntity; private Long languageId; } – Mohammad Makahleh Feb 28 '19 at 09:39
@SimonMartinelli As above – Mohammad Makahleh Feb 28 '19 at 09:39
If you have an Id Class you must have all attributes in IdClass also in the entity. In your case in TranslationBase http://www.thejavageek.com/2014/05/01/jpa-idclass-example/ – Simon Martinelli Feb 28 '19 at 10:17
@SimonMartinelli The problem solved after i created a PK class for every translation class and i annoted them with IdClass – Mohammad Makahleh Feb 28 '19 at 11:32
But i don't think this is the best practice since the PK class is the same for all – Mohammad Makahleh Feb 28 '19 at 11:33
but then IdClass would not work – Simon Martinelli Feb 28 '19 at 16:35

MappedSuperclass maps all child entities to one child

0 Answers0