transients
目的 Purpose
Defines a list of property names that should not be persisted to the database. This is often useful if you have read-only accessor methods ("getters") that are helper methods but get confused as being persistence-related.
使用例 Examples
class Author {
String name
String getUpperCaseName() { name.toUpperCase() } static transients = ['upperCaseName']
}
Here we have an accessor that takes the name and converts it to uppercase. It doesn't make sense to persist this derived value, so we mark it as transient adding its JavaBean property name to the transients list.