(Quick Reference)
constraints
目的
Purpose
Allows the definition of declarative validation constraints. See
Validation in the user guide.
使用例
Examples
class Book { String title
Author author static constraints = {
title blank: false, size: 5..150
author nullable: true
}
}詳細
Description
Constraints are defined using the declarative constraints DSL as described in the
Validation section of the user guide. Once evaluated, validation can be applied through the use of the
validate method:
def b = new Book()
assert !b.validate()
A list of api:org.codehaus.groovy.grails.validation.ConstrainedProperty instances applied against the domain class by the
constraints property is available at runtime:
for (constraint in b.constraints) {
println it.name
println it.maxSize
}
