gistfile1.txt

module Criterion
  @@registered = {}

  def self.register(name, &block)
    @@registered[name] = block
  end

  def self.format_age(date)
    begin
      age = Date.today.year - date.year

      if Date.today.month < date.month || (Date.today.month == date.month && date.day >= Date.today.day)
        age = age - 1
      end
      if age >= User::MINIMUM_AGE
        age
      else
        "unknown"
      end

    rescue
      "unknown"
    end
  end  

  # Returns a boolean indicating if the user passed 
  # as a parameter satisfies the criterion 
  def self.satisfied_by?(user, name, *args)
    begin
      @@registered[name].call(user, *args)
    rescue Exception => e
      HoptoadNotifier.notify(:error_class => "User attributes error", :error_message => "Error with user #{user.id}:  #{e.message}")
      return false
    end
  end

  # Add new criteria here where the logic is centralized 
  Criterion.register(:age) do |user, age|
    self.format_age(user.date_of_birth).to_i > age
  end
  Criterion.register(:country) do |user, country|
    Country.find(user.location_country_id).code == country
  end
  Criterion.register(:sex) do |user, sex|
    Sex.const_get(sex.upcase.to_sym) == user.sex
  end
  Criterion.register(:region) do |user, region|
    region.include? Region.find(user.location.region).iso_id
  end
  Criterion.register(:language) do |user, language|
    language == user.user_settings.language
  end
end