I'm currently in the process of upgrading old legacy Rails app and trying to find the exact version number when this reversible.up, reversible.down block feature was introduced.

class SplitNameMigration < ActiveRecord::Migration
  def change
    add_column :users, :first_name, :string
    add_column :users, :last_name, :string

    reversible do |dir|
      User.reset_column_information
      User.all.each do |u|
        dir.up   { u.first_name, u.last_name = u.full_name.split(' ') }
        dir.down { u.full_name = "#{u.first_name} #{u.last_name}" }
        u.save
      end
    end
  end
end

Does anyone know?

CodePudding user response：

4.0.0 it was.

New method reversible makes it possible to specify code to be run when migrating up or down. See the Guide on Migration