class Grape::Validations::Validators::ExceptValuesValidator

def initialize(attrs, options, required, scope, opts)
  @except = options.is_a?(Hash) ? options[:value] : options
  super
end

def validate_param!(attr_name, params)
  return unless params.respond_to?(:key?) && params.key?(attr_name)
  excepts = @except.is_a?(Proc) ? @except.call : @except
  return if excepts.nil?
  param_array = params[attr_name].nil? ? [nil] : Array.wrap(params[attr_name])
  raise Grape::Exceptions::Validation.new(params: [@scope.full_name(attr_name)], message: message(:except_values)) if param_array.any? { |param| excepts.include?(param) }
end