module ActiveAdmin::Settings::ClassMethods

def setting(name, default)
  default_settings[name] = default
  attr_accessor(name)
  # Create an accessor that grabs from the defaults
  # if @name has not been set yet
  class_eval <<-EOC, __FILE__, __LINE__ + 1
    def #{name}
      if instance_variable_defined? :@#{name}
        @#{name}
      else
        read_default_setting(:#{name})
      end
    end
  EOC
end