last_stored_environment

# File activerecord/lib/active_record/migration.rb, line 1197
    def last_stored_environment # :nodoc:
      return nil unless ActiveRecord::InternalMetadata.enabled?
      return nil if current_version == 0
      raise NoEnvironmentInSchemaError unless ActiveRecord::InternalMetadata.table_exists?

      environment = ActiveRecord::InternalMetadata[:environment]
      raise NoEnvironmentInSchemaError unless environment
      environment
    end