instance method deprecated_setup

# File activemodel/lib/active_model/validator.rb, line 127
    def deprecated_setup(options) # TODO: remove me in 4.2.
      return unless respond_to?(:setup)
      ActiveSupport::Deprecation.warn "The `Validator#setup` instance method is deprecated and will be removed on Rails 4.2. Do your setup in the constructor instead:

class MyValidator < ActiveModel::Validator
  def initialize(options={})
    super
    options[:class].send :attr_accessor, :custom_attribute
  end
end
"
      setup(options[:class])
    end