runnable

# File activerecord/lib/active_record/migration.rb, line 1154
    def runnable
      runnable = migrations[start..finish]
      if up?
        runnable.reject { |m| ran?(m) }
      else
        # skip the last migration if we're headed down, but not ALL the way down
        runnable.pop if target
        runnable.find_all { |m| ran?(m) }
      end
    end