+ def delete_with_history(user)
+ if self.visible
+ if RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id", :conditions => [ "visible = 1 AND member_type='relation' and member_id=?", self.id ])
+ raise OSM::APIPreconditionFailedError.new
+ else
+ self.user_id = user.id
+ self.tags = []
+ self.members = []
+ self.visible = false
+ save_with_history!
+ end
+ else
+ raise OSM::APIAlreadyDeletedError.new
+ end
+ end
+
+ def update_from(new_relation, user)
+ if !new_relation.preconditions_ok?
+ raise OSM::APIPreconditionFailedError.new
+ else
+ self.user_id = user.id
+ self.tags = new_relation.tags
+ self.members = new_relation.members
+ self.visible = true
+ save_with_history!
+ end
+ end
+