rails の migration で reversible な change_column はありますか？ rails migration nullable not null def change change_column :table_name, :column_name, :column_type, null: false end reversible db:rollback IrreversibleMigration reversible migration

reversible change_column default null



* change_column_null
* change_column_default ( `from` `to` )






def change
change_column_null :table_name, :column_name, false, value_for_already_null_record_column
end


:

<