migrate

# File activerecord/lib/active_record/tasks/database_tasks.rb, line 166
      def migrate
        check_target_version

        verbose = ENV["VERBOSE"] ? ENV["VERBOSE"] != "false" : true
        scope = ENV["SCOPE"]
        verbose_was, Migration.verbose = Migration.verbose, verbose
        Base.connection.migration_context.migrate(target_version) do |migration|
          scope.blank? || scope == migration.scope
        end
        ActiveRecord::Base.clear_cache!
      ensure
        Migration.verbose = verbose_was
      end