class AddBadgePostsAndTopicsView < ActiveRecord::Migration[4.2] def up add_column :categories, :allow_badges, :boolean, default: true, null: false execute "CREATE VIEW badge_posts AS SELECT p.* FROM posts p JOIN topics t ON t.id = p.topic_id JOIN categories c ON c.id = t.category_id WHERE c.allow_badges AND p.deleted_at IS NULL AND t.deleted_at IS NULL AND t.visible" end def down execute "DROP VIEW badge_posts" remove_column :categories, :allow_badges end end