Ruby on Rails 6.0.6.1
Module
ActiveRecord::Migration::Compatibility
activerecord/lib/active_record/migration/compatibility.rb
Namespace
CLASS
ActiveRecord::Migration::Compatibility::V4_2
CLASS
ActiveRecord::Migration::Compatibility::V5_0
CLASS
ActiveRecord::Migration::Compatibility::V5_1
CLASS
ActiveRecord::Migration::Compatibility::V5_2