RailsDoc(β)
v5.2
v8.0
v7.2
v7.1
v7.0
v6.1
v6.0
v5.2
GitHub
Ruby on Rails 5.2.8
Class
ActiveRecord::Migration::Compatibility::V5_1
< ActiveRecord::Migration::V5_2
activerecord/lib/active_record/migration/compatibility.rb