How to associate one problem with another parameter problem

Question

Suppose you have this code from the ActiveSupport :: Concern documentation, but you want the included Foo block to have something different depending on the module or class, including Foo.

In the specific problem I'm trying to solve, I have a set of validations for addresses, but the address fields will be called home_zip_code or work_zip_code, and I want the inclusion of validation to confirm the zip_code field prefix.

require 'active_support/concern'

module Foo
  extend ActiveSupport::Concern
  included do
    # have some_value be accessible 
    def self.method_injected_by_foo
      ...
    end
  end
end

module Bar
  extend ActiveSupport::Concern
  # set some_value that will used when Foo is included 
  include Foo

  included do
    self.method_injected_by_foo
  end
end

class Host
  include Bar # It works, now Bar takes care of its dependencies
end

I posted this discussion here: http://forum.railsonmaui.com/t/how-make-a-concern-parameterized/173

The following two work options. I wonder which is preferable.

Concern Using Class Method

This is the problem that needs to be "parameterized":

module Addressable
  extend ActiveSupport::Concern

  included do
    zip_field = "#{address_prefix}_zip_code".to_sym

    zip_code_regexp = /^\d{5}(?:[-\s]\d{4})?$/

    validates zip_field, format: zip_code_regexp, allow_blank: true
end

address_prefix Addressable.

cattr_accessor :address_prefix
self.address_prefix = "home"
include Addressable

def self.address_prefix
    "home"
end
include Addressable

self.append_features .

  def self.append_features(base)
    base.class_eval do
      def self.address_prefix
        "home"
      end
    end
    super
  end

  def self.append_features(base)
    base.cattr_accessor :address_prefix
    base.address_prefix = "home"
    super
  end

• , cattr_accessor ?
• self.append_features ?
• class_eval , class exec? , . .
• , , "work" "home", . , . , ? ?