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Index
Usage of own validation method
Regular Expressions
Command Objects
Validating Domain Classes
Grails allows you to apply constraints to a domain class that can then be used to validate a domain class instance. Constraints are applied using a "constraints" closure which uses the Groovy builder syntax to configure constraints against each property name, for example:
class Contact {
String firstName
String middleInitial
String lastName
String phone
String email
Date birthDay
Address address
static constraints = {
firstName(blank:false,size:3..30)
middleInitial(blank:false, maxSize:1)
lastName(blank:false,maxSize:30)
phone(blank:false, unique:true, matches:/^\([1-9]\d{2}\)\s?\d{3}\-\d{4}$/))
email(blank:false,email:true)
birthday(nullable:false,min:new Date())
address(nullable:false)
}
}
To validate a domain class you can call the "validate()" method on any instance:
def contact = new Contact()
//populate properties e.g. contact.properties = params
if ( contact.validate() ) {
do work.....
}
else {
contact.errors.allErrors.each {
println it
}
}
In the reference that follows, className.propertyName.validationConstraint refers to the error message codes defined in /grails-app/i18n/message.properties_.
For example, referring to the above class, the error message might be defined as: contact.firstName.blank=Please enter a firstName
contact.firstName.size.toobigl=Firstname [{2}] exceeds the maximum size of [{3}]
contact.phone.matches.invalid=Phone No [{2}] invalid
[{0}] = property
[{1}] = class
[{2}] = value
[{3}] = constraint
For the See more Grails standard validations Grails validation reference.
Usage of own validation method. Back
For each property validation, you can write your own validation method.
To call your own method is validator: with a closure (param1 and/or param2)
param1 = property (zipCode)
param2 = object instance address
class Address {
String zipCode
static constraints = {
zipCode(nullable:false, validator: { val, obj ->
if ( !obj.validateZipCode(val) ) return ['invalid']
})
}
def boolean validateZipCode(def zipCode){
def zipCode = ZipCode.get(zipCode)
if ( zipCode )
return true
else
return false
}
}
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