If you're generating a Rails migration, chances are you might need to facilitate migrating data to a new column. You can use
reset_column_information in a migration file to pick up your changes and immediately do something with those new columns.
Assuming we have 2 models,
class AddColumnDraftToPosts < ActiveRecord::Migration[5.2] def change add_column :posts, :draft, :boolean, default: true Post.reset_column_information DraftPost.all.each do |draft_post| Post.create(content: draftPost.content) draft_post.delete end end