+
+ private
+
+ def save_with_history!
+ t = Time.now
+
+ # update the bounding box, but don't save it as the controller knows the
+ # lifetime of the change better. note that this has to be done both before
+ # and after the save, so that nodes from both versions are included in the
+ # bbox.
+ changeset.update_bbox!(bbox) unless nodes.empty?
+
+ Way.transaction do
+ self.version += 1
+ self.timestamp = t
+ self.save!
+
+ tags = self.tags
+ WayTag.delete_all(['id = ?', self.id])
+ tags.each do |k,v|
+ tag = WayTag.new
+ tag.k = k
+ tag.v = v
+ tag.id = self.id
+ tag.save!
+ end
+
+ nds = self.nds
+ WayNode.delete_all(['id = ?', self.id])
+ sequence = 1
+ nds.each do |n|
+ nd = WayNode.new
+ nd.id = [self.id, sequence]
+ nd.node_id = n
+ nd.save!
+ sequence += 1
+ end
+
+ old_way = OldWay.from_way(self)
+ old_way.timestamp = t
+ old_way.save_with_dependencies!
+
+ # update and commit the bounding box, now that way nodes
+ # have been updated and we're in a transaction.
+ changeset.update_bbox!(bbox) unless nodes.empty?
+
+ # tell the changeset we updated one element only
+ changeset.add_changes! 1
+
+ changeset.save!
+ end
+ end
+