How to have multiple One-to-One relationships between three domain classes - grails

Question

As a follow up question to this, I want to have a User domain class which has an optional one-to-one relationship with BasicProfile domain class, User being the owner which may or may not have a profile. I have this part figured out. What I also want is an optional one-to-one relationship between the AcademicProfile domain class and the User, AcademicProfile being the owner, such that an AcademicProfile may or may not have a User. When I try to replicate this the way I did the first one-to-one relationship, it does not work. Here are my classes.
class User {
String username
String password
String email
AcademicProfile academicProfile
Date dateCreated
Date lastUpdated
static hasOne = [basicProfile: BasicProfile]
static constraints = {
username size: 3..20, unique: true, nullable: false, validator: { _username ->
_username.toLowerCase() == _username
}
password size: 6..100, nullable: false, validator: { _password, user ->
_password != user.username
}
email email: true, blank: false
basicProfile nullable: true
}
}
class BasicProfile extends Profile {
User user
Date dateCreated
Date lastUpdated
}
class AcademicProfile extends Profile {
String dblpId
String scholarId
String website
Date dateCreated
Date lastUpdated
static hasOne = [user: User]
static hasMany = [publications: Publication]
static constraints = {
dblpId nullable: true
scholarId nullable: true
website nullable: true, url: true
publications nullable: true
user nullable: true
}
}
class Profile {
String firstName
String middleName
String lastName
byte[] photo
String bio
static constraints = {
firstName blank: false
middleName nullable: true
lastName blank: false
photo nullable: true, maxSize: 2 * 1024**2
bio nullable: true, maxSize: 500
}
static mapping = {
tablePerSubclass true
}
}
When I run it, I get the error: Field error in object 'org.academic.User' on field 'academicProfile': rejected value [null];. I don't understand what I am doing wrong.

Answer 1

You'll have to add nullable:true constraint for AcademicProfile academicProfile in User class as you mentioned that you need an 'optional' relationship between AcademicProfile & User.
The error itself is self explanatory though, that you can't create a User class's instance, without providing the academicProfile property a non-null value.