Ruby open class refactoring

gistfile1.txt

class ActiveRecord::Base
  def self.has_statuses(*status_names)
    validates :status,
              :presence => true,
              :inclusion => { :in => status_names }
    
    # Status Finders
    status_names.each do |status_name|
      scope "all_#{status_name}", where(:status => status_name)
    end
    
    # Status Accessors
    status_names.each do |status_name|
      define_method "#{status_name}?" do
        status == status_name
      end
    end
    
  end
end

class Purchase < ActiveRecord::Base
  has_statuses :in_progress, :submitted, :approved, :shipped,
                 :received
end



class Purchase < ActiveRecord::Base
  STATUSES = %w(in_progress submitted approved shipped received)
  validates_presence_of :status
  validates_inclusion_of :status, :in => STATUSES

# Status Finders
  class << self
    STATUSES.each do |status_name|
      define_method "all_#{status_name}"
      where(:status => status_name)
    end
  end
  
# Status Accessors
  STATUSES.each do |status_name|
    define_method "#{status_name}?"
    status == status_name
  end
end