class FixLinkPostId < ActiveRecord::Migration[4.2] def up to_remove = [] TopicLink.where('internal = TRUE AND link_post_id IS NULL').each do |tl| begin parsed = URI.parse(tl.url) route = Rails.application.routes.recognize_path(parsed.path) if route[:topic_id].present? post = Post.find_by(topic_id: route[:topic_id], post_number: (route[:post_number] || 1)) tl.update_column(:link_post_id, post.id) if post.present? end rescue ActionController::RoutingError to_remove << tl.id end end TopicLink.where("id in (?)", to_remove).delete_all end def down end end