last_stored_environment

# File activerecord/lib/active_record/migration.rb, line 1351
    def last_stored_environment # :nodoc:
      internal_metadata = connection_pool.internal_metadata
      return nil unless internal_metadata.enabled?
      return nil if current_version == 0
      raise NoEnvironmentInSchemaError unless internal_metadata.table_exists?

      environment = internal_metadata[:environment]
      raise NoEnvironmentInSchemaError unless environment
      environment
    end