(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
Web requests resulting from form submissions will have blank strings, not null, for properties that have no value. Keep this in mind when working with the nullable constraint since a blank string will validate for both nullable:true and nullable:false. Set the blank constraint to false to ensure that an empty value fails validation.
