module ActiveAdmin::ViewHelpers::DisplayHelper

def pretty_format(object)

We attempt to #display_name of any other objects
ActiveRecord objects are formatted via #auto_link
Date Time are formatted via #localize with :format => :long
Return a pretty string for any object 
def pretty_format(object)
  case object
  when String
    object
  when Arbre::HTML::Element
    object
  when Date, Time
    localize(object, :format => :long)
  when ActiveRecord::Base
    auto_link(object)
  else
    display_name(object)
  end
end