Constraints in grails

class User {
    String firstName
    String lastName
    String passwordHash

    static constraints = {
        firstName blank: false, nullable: false
        lastName blank: false, nullable: false
        passwordHash blank: false, nullable: false
    }
}

Constraint in grails

class User {
    ...

    static constraints = {
        login shared: "myShared"
    }
}

Source: docs.grails.org

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