Using method_missing to dynamically create subject listing for objects based on role

Committee.rb

class DynamicFinderMatch
  attr_accessor :attribute
  def initialize(method_sym)
    if Role.all(:select => 'name').map{|n| n.name.pluralize}.include?(method_sym.to_s)
      @attribute = method_sym
    end
  end

  def match?
    @attribute != nil
  end
end


class Committee < ActiveRecord::Base
  acts_as_authorization_object

  validates_presence_of :name

  def method_missing(method_sym, *arguments, &block)
    match = DynamicFinderMatch.new(method_sym)
    if match.match?
      self.class.class_eval <<-EOF, __FILE__, __LINE__
        def #{method_sym}
          corresponding_role_ids = self.accepted_roles.all(:select => 'id', :conditions => { :name => '#{method_sym.to_s.singularize}' }).map(&:id)
          return User.all(:include => :roles, :conditions => ['roles.id IN (?)', corresponding_role_ids])
        end
      EOF
      send method_sym
    else
      super
    end
  end

  def respond_to?(method_sym, include_private = false)
    if DynamicFinderMatch.new(method_sym).match?
      true
    else
      super
    end
  end

end