Hej! If I have a SQL table that defines such a tab...

# spring

[quiqua]

Hej! If I have a SQL table that defines such a table

CREATE TABLE elements (
  id SERIAL PRIMARY KEY,
  resource_id VARCHAR(50) UNIQUE DEFAULT uuid_generate_v4(),
  name VARCHAR(100) NOT NULL
)

and a class like

@Entity
@Table(name = "elements")
data class Element(
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column
    var id: Int?,
    @Column
    var resourceId: String?,
    @Column
    var name: String?
)

How can I only create new objects via val elem = Element(name="foo") and let the rest be automatically created via JPA/Hibernate

Is that even possible in my case? Do I just need different constructors then?

[jbnizet]

var id: Int? = null, var resourceId: String? = UUID.randomUUID().toString()?
If you let the database generate the UUID, you’d be forced forced to refresh the entity right after it’s been created in order for Hibernate to know what UUID the database has generated. So why not generate it in Java? That said, you shouldn’t use data classes for JPA entities. Their toString(), hashCode() and equals() implementation are not really adequate, and can even be dangerous if you have associations.

[quiqua]

Thank you! Things are working fine now and I’ve removed the “DEFAULT” column value 🙂