how to prevent casade on updates - grails

Question

I'm working in grails and I've noticed some strange behavior to which I'd like to fix but I cannot figure out what I'm missing.
I have a location which can have may buildings. Each building can have multiple suites.
In addition I have a tenant who has a tenant location. The tenant location is used more for historical reporting so that we can see if tenants have moved locations.
The classes look like this
class Location {
String name
String shortName
Country country
LocationTypeEnum locationType = LocationTypeEnum.STUD // as default
static hasMany = [building: Building]
Date dateCreated
Date lastUpdated
static constraints = {
name unique: true, maxSize: 30
shortName unique: true, maxSize: 3
country nullable: false
locationType nullable: false
}
static mapping = {
cache usage: 'nonstrict-read-write', include: 'non-lazy'
}
}
class Building {
String type
String name
Date dateCreated
Date lastUpdated
static belongsTo = [location: Location]
static hasMany = [suites: Suite]
static constraints = {
name unique: true, maxSize: 25
type inList: ["A", "B", "C"], nullable: true
}
String toString() {
name
}
}
class Suite {
int suiteNumber
Date dateCreated
static belongsTo = [building: Building]
static constraints = {
pen(validator: { return it > 0 && (it.toString().length()) <= 3 })
}
String toString() {
suite.toString()
}
}
class Tenant {
static hasMany = [tenantLocation: TenantLocation]
----
Suite suite
String comments
Date dateCreated
Date lastUpdated
boolean active = true
static constraints = {
--------
type
nullable: false
comments maxSize: 5000
}
}
class TenantLocation {
static belongsTo = [tenant: Tenant]
Tenant tenant
Suite suite
Date dateCreated
}
So the idea is that a tenant location is created when tenant is created and a new tenantLocation is created only if and when the current tenant suite changes.
However, what I'm seeing is not only is the tenantLocation being saved (which is what I want) the suite is also being updated (which is not what I want).
For example I have Building 1 and suites 1 - 20 and Building 2 with suites 1 - 25. I have a tenant that is in Building 1 suite 5, they move to Building 2 suite 23. Now all of a sudden Building 2 has two suites with a suite number of 5.
How do I keep my suites from moving from one building to another when I only want the suite the tenant has to change?
The Code that is doing the updating is in the Tenant Controller and looks like this:
def update() {
def tenantInstance = Tenant.get(params.id)
if (!tenantInstance) {
flash.message = message(code: 'default.not.found.message', args: [
message(code: 'tenant.label', default: 'Tenant'),
params.id
])
redirect action: "list"
return
}
if (params.version) {
def version = params.version.toLong()
if (tenantInstance.version > version) {
tenantInstance.errors.rejectValue("version", "default.optimistic.locking.failure",
[
message(code: 'tenantInstance.label', default: 'Tenant')] as Object[],
"Another user has updated this Tenant while you were editing")
render view: "edit", model: [tenantInstance: tenantInstance, BuidingListInstance: Building.list()]
return
}
}
tenantInstance.properties = params
if (!tenantInstance.save(flush: true)) {
render view: "edit", model: [tenantInstance: tenantInstance, BuildingListInstance: Building.list()]
return
}
def tenantLocation= TenantLocation.findAllByTenant(tenantInstance)
def locationCheck = tenantLocation.last()
//if tenant location is not null and the suite/building change create new Tenant Location entry
if (tenantLocation!=null)
{
if(locationCheck.pen.id !=tenantInstance.suite.id)
{
def location = new TenantLocation(
tenant: tenantInstance,
suite: tenantInstance.suite,
dateCreated: new Date()
).save(flush:true)
}
}
flash.message = message(code: 'default.updated.message', args: [
message(code: 'tenant.label', default: 'Tenant'),
tenantInstance.id
])
redirect action: "show", id: tenantInstance.id
}