Function valid::invalid_optional_value

pub fn invalid_optional_value(
    code: impl Into<Cow<'static, str>>, 
    field_name: impl Into<FieldName>, 
    actual: Option<Value>, 
    expected: Option<Value>
) -> ConstraintViolation

Convenience function to construct a ConstraintViolation for a validation performed in the FieldName context.

Use this method if the field value is optional. If the field is not of type Option<T> consider using the invalid_value method instead.