grails - pertenece a dominio múltiple

gorm grails-plugin

Question

Tengo 4 clases, incidentes, problemas, solicitudes y otro es Adjunto.

Cada dominio se parece a .........

 Class Incidents
{
// other fields
static hasOne = [attachment: Attachment]
static constraints = [attachment nullable:true]
}
Class Problems
{
// other fields
static hasOne = [attachment: Attachment]
static constraints = [attachment nullable:true]
}
Class Requests
{
// other fields
static hasOne = [attachment: Attachment]
static constraints = [attachment nullable:true]
}
Class Attachment
{
// other fields
static belongsTo= [
incident: Incidents,
problem: Problems,
requests: Requests
]
static constraints = {
incident nullable: true
problem nullable: true
requests nullable: true
}

cuando estoy guardando el objeto del incidente, arroja una excepción como Columna ''problema_id'' no puede ser nulo. ¿qué hacer?

Answer 1

Intenta eliminar los incidentes, problemas y solicitudes de HasOne en clase y reemplázalo con

 Attachment attachment
static constraints = {attachment: unique: true, nullable:true}
static mapping = {
attachment cascade: "delete"
}