(Quick Reference)
nullable
Purpose
Allows a property to be set to
null. By default Grails does not allow
null values for properties.
Examples
Description
Set to
true if the property allows
null values. This constraint influences
schema generation.
Error Code:
className.propertyName.nullable
An empty form field will appear in the request parameters as an empty string, not as null. Keep this in mind when setting domain fields directly from request parameters. Set the blank constraint to false to ensure that such an empty value fails validation.
