grails-embedded-nullables

An example application using grails 3.3.1 and gorm 6.1.8 to demonstrate an issue about domain entities having embedded components.

The issue is that the default nullable constraint is ignored for embedded components.

The default constraint in application.groovy

grails.gorm.default.constraints = {
    '*'(nullable: true)
} 

The embedded component: Address.groovy

class Address {
    String street
    String zipCode
    String city
} 

The domain entity: User.groovy

class User {
    String username
    String password
    String comment
    Address address = new Address()

    static constraints = {
    }
    static embedded = ['address']
}

The demo code showing the behaviour: BootStrap.groovy

class BootStrap {
    def messageSource

    def init = { servletContext ->
        User u = new User()

        u.username = 'admin'
        u.address.city = 'Berlin'

        boolean valid = u.validate()

        if (!valid) {
            u.errors.fieldErrors.each {
                println(messageSource.getMessage(it, Locale.US))
            }
        }

        assert valid

        User.withTransaction {
            u.save(flush: true)
        }
    }

    def destroy = {
    }
}       

The expected behaviour is, that the application starts because the default constraints should allow null for all fields.

But the validation fails because of the folling errors:

Property [street] of class [class grails.embedded.nullables.Address] cannot be null
Property [zipCode] of class [class grails.embedded.nullables.Address] cannot be null