class ActiveModel::Validations::AcceptanceValidator::AttributeDefinition

def convert_to_reader_name(method_name)
  method_name.to_s.chomp("=")
end

def define_on(klass)
  attr_readers = attributes.reject { |name| klass.attribute_method?(name) }
  attr_writers = attributes.reject { |name| klass.attribute_method?("#{name}=") }
  klass.send(:attr_reader, *attr_readers)
  klass.send(:attr_writer, *attr_writers)
end

def initialize(attributes)
  @attributes = attributes.map(&:to_s)
end

def matches?(method_name)
  attr_name = convert_to_reader_name(method_name)
  attributes.include?(attr_name)
end