record_version_state_after_migrating

# File activerecord/lib/active_record/migration.rb, line 589
      def record_version_state_after_migrating(version)
        table = Arel::Table.new(self.class.schema_migrations_table_name)

        @migrated_versions ||= []
        if down?
          @migrated_versions.delete(version)
          table.where(table["version"].eq(version.to_s)).delete
        else
          @migrated_versions.push(version).sort!
          table.insert table["version"] => version.to_s
        end
      end