class ProfileEntity : RNValidatable {
    var firstName:String
    var lastName:String

    init(firstName:String, lastName:String){
        self.firstName = firstName
        self.lastName = lastName
    }

    func bindConstraint(binder: RNConstraintBinder) {
        binder.bind(firstName, accessTag: "firstName")
            .add(constraint:RNConstraintLength(max: 10, errorMessage: "Invalid range"))
            .add(constraint:RNConstraintAlphabet(errorMessage: "Only alphabets."))
        binder.bind(lastName, accessTag: "lastName")
            .add(constraint:RNConstraintLength(max: 10, errorMessage: "Invalid range"))
            .add(constraint:RNConstraintAlphabet(errorMessage: "Only alphabets."))
    }
}

let results = RNValidator.sharedInstance.validate(model)
if results.isInvalid {
    if let firstNameErrorMessages = results.fields["firstName"] {
        firstNameMessageLabel.text = firstNameErrorMessages.messages.joined(separator:"\n")
    }
    if let lastNameErrorMessages = results.fields["lastName"] {
        lastNameMessageLabel.text = lastNameErrorMessages.messages.join(separator:"\n")
    }
}