mailer_setting.rb

module Settings
  class Mail
    include ActiveModel::Validations
    include ActiveModel::Model
    ATTRIBUTES = [ :administrator, :email_reply_address, :email_subject_prefix, :send_welcome_email ]
    attr_accessor *ATTRIBUTES


    validates :administrator, :email_reply_address, :format => {
      :with => /\A(([\w!#\$%&\'\*\+\-\/=\?\^`\{\|\}~]+((\.\"[\w!#\$%&\'\*\+\-\/=\?\^`\{\|\}~\"\(\),:;<>@\[\\\] ]+(\.[\w!#\$%&\'\*\+\-\/=\?\^`\{\|\}~\"\(\),:;<>@\[\\\] ]+)*\")*\.[\w!#\$%&\'\*\+\-\/=\?\^`\{\|\}~]+)*)|(\"[\w !#\$%&\'\*\+\-\/=\?\^`\{\|\}~\"\(\),:;<>@\[\\\] ]+(\.[\w !#\$%&\'\*\+\-\/=\?\^`\{\|\}~\"\(\),:;<>@\[\\\] ]+)*\"))
    @[a-z0-9]+((\.[a-z0-9]+)*|(\-[a-z0-9]+)*)*\z/ix }

    def initialize(attributes = {})
      super(attributes)
      initialize_settings
    end

    def save
      Setting.update(*updated_attributes) if valid?
    end

    private

    def updated_attributes
      settings = {}
      ATTRIBUTES.each do |name|
        setting = record_for(name)
        if setting.nil?
          raise "unable to find setting: #{name}"
        else
          settings[setting.id] = {:value => send(name) }
        end
      end
      return [settings.keys, settings.values]
    end

    def record_for(setting_name)
      db_records.detect {|s| setting_name.to_s == s.name}
    end

    def db_records
      @db_records ||= Setting.where(:name => ATTRIBUTES)
    end

    def initialize_settings
      db_records.each do |setting|
        send("#{setting.name}=", setting.value)
      end
    end

  end
end