belongs_to :current_way, :class_name => "Way", :foreign_key => "way_id", :inverse_of => :old_ways
has_many :old_nodes, :class_name => "OldWayNode", :foreign_key => [:way_id, :version], :inverse_of => :old_way
has_many :old_tags, :class_name => "OldWayTag", :foreign_key => [:way_id, :version], :inverse_of => :old_way
belongs_to :current_way, :class_name => "Way", :foreign_key => "way_id", :inverse_of => :old_ways
has_many :old_nodes, :class_name => "OldWayNode", :foreign_key => [:way_id, :version], :inverse_of => :old_way
has_many :old_tags, :class_name => "OldWayTag", :foreign_key => [:way_id, :version], :inverse_of => :old_way