We usually specify validation constraints in domain classes and command objects.
\nBut, if it is required to provide validation in other classes(like classes in src\/groovy), we can do so in two ways :
\n1. Defining a static constraints property in the class and using the @validateable annotation.
\n2. Defining a static constraints propery in the class and making an entry of the class in grails.validateable.classes property in config.groovy. <\/p>\n
Here is an example of first way:
\n[java]
\npackage com.example.dto
\nimport grails.validation.Validateable
\n@Validateable
\nclass DataDTO {
\n\tString site
\n\tInteger views<\/p>\n
\tstatic constraints = {
\n\t\tsite blank: false
\n\t\tviews blank: false
\n\t}
\n}
\n[\/java]
\nIf a class is not marked with @Validateable, it may still be made validateable by defining the static constraints property in the class (as shown above) and then assigning class name(with package name) to the grails.validateable.classes property in Config.groovy:<\/p>\n
[java]
\ngrails.validateable.classes = [com.example.dto.DataDTO]
\n[\/java]<\/p>\n