Tenants.withoutId won't work for Entity persisting

[kevinclcn]

Steps to Reproduce

1. create an entity extended the MultiTenant traits, for example:

class Demo implements MultiTenant<Demo> {
   Integer tenantId
   String message
}

2. save the Entity with Tenants.withoutId()

Tenants.withoutId {
   def demo = new Demo()
   demo.tenantId = 1
   demo.message = 'just a test'
   demo.save()
}

Expected Behaviour

The demo should be persisted into mysql

Actual Behaviour

Below exception is thrown:

Caused by: java.lang.IllegalArgumentException: Cannot assign value [DEFAULT] to property [tenantId] of type [java.lang.Integer] of class [demo.Demo]. The value could not be converted to the appropriate type: Failed to convert from type [java.lang.String] to type [java.lang.Integer] for value 'DEFAULT'; nested exception is java.lang.NumberFormatException: For input string: "DEFAULT"
    at org.grails.datastore.mapping.reflect.FieldEntityAccess.setProperty(FieldEntityAccess.java:95)
    at org.grails.orm.hibernate.multitenancy.MultiTenantEventListener.onApplicationEvent(MultiTenantEventListener.java:74)

Environment Information

• Operating System: Mac OS 10.13.2
• GORM Version: 6.1.6
• Grails Version (if using Grails): 3.3.1
• JDK Version: jdk8

other information

The Tenants.withoutId() works for Demo.get(1), so I think this should be a bug.

[KoloritnijClap]

If you want to save under another tenant better to use Tenants.withTenant(1) {} It will work like you expect.