activity_log.rb

class ActivityLog

  include DataMapper::Resource

  property :id, Serial
  
  property :type, Discriminator
  property :model_id, Integer

  property :event, String
  property :diff, JSON

  property :user_id, Integer
  property :staff_id, Integer

  def self.save_with_log(object, saver, options, &blk)
    if object.save
      diff = object.attributes.reject{|k,v| options[:exclude_attributes]}
      create( :event => "save", 
              :model_id => object.id, 
              :diff => diff,
              :staff_id => saver.id if saver.class == Staff, 
              :user_id => object.user ? object.user.id : nil
              )      
    else
      return false
    end
  end

  def self.update_with_log(object, attrs, saver, options, &blk)
    orig_attrs = object.attributes
    if object.update(attrs)
      diff = orig_attrs.log_diff(object.attributes).reject{|k,v| options[:exclude_attributes].include?(k)}
      create(:event => "update", 
           :model_id => object.id, 
           :diff => diff,
           :staff_id => saver.id if saver.class == Staff, 
           :user_id => object.user ? object.user.id : nil)    
    end
  end
  

end

class FooActivityLog < ActivityLog


end