class Image < ActiveRecord::Base belongs_to :auction_item belongs_to :item acts_as_list :scope => :auction_item_id acts_as_list :scope => :item_id file_column :image, :magick => { :versions => { :thumb => {:crop => "1:1", :size => "150x150!", :name => "thumb"}, :normal => {:size => "400x300>"} } } end