Grails "Created By" and "Last Updated By" Fields.

Grails Domain Example

// domain
class MyDomainEntity {
    transient springSecurityService
  
    // usual fields ...  
    String  name 
    // ...
    
    Date    dateCreated
    Date    lastUpdated
    String  createdBy
    String  lastUpdatedBy
    
    static transients = ['springSecurityService']
    static constraints = {
        // ... usual fields
        
        dateCreated   nullable: true
        lastUpdated   nullable: true
        createdBy     nullable: true
        lastUpdatedBy nullable: true
    }
    String toString() { name }
    def beforeInsert(){ createdBy = springSecurityService.getPrincipal()?.getUsername() }
    def beforeUpdate(){ lastUpdatedBy = springSecurityService.getPrincipal()?.getUsername() }
}