ValidationRuleRequired is not working

[nrikiji]

Why is this code valid?
How to use Wrong?

 var validationRuleSet = ValidationRuleSet<String?>()
let stringRequiredRule = ValidationRuleRequired<String?>(error: ValidationError(message: "email is required."))
validationRuleSet.add(rule: stringRequiredRule)

let email: String? = nil
let validationResult = Validator.validate(input: email, rules: validationRuleSet)
print(validationResult) // -> valid

[anelad]

True. I've just encountered that too.

Validation only checks if the value is nil or not. But for String type it should check for empty strings too. Since validation uses generics for input types, it is not able to check, because it does not know what type its input is.

For a temporary fix, you can use this in ValidationRuleRequired.swift file

public func validate(input: T?) -> Bool {
      if let input = input as? String {
        return input.count > 0
      }
      return input != nil
}

P.S.
Another temporary fix is setting textField's value to nil if it's value is an empty string, using UITextFieldDelegate. For example:

func textFieldDidEndEditing(_ textField: UITextField) {
    if textField.text?.count == 0 {
        textField.text = nil
    }
}

If you are using validateOnInputChange; you may use textField(_:shouldChangeCharactersIn:replacementString:) instead