You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: calculator.rb
    path of file: ./repos/open-build-service/src/api/app/models/project_status
    
    the code of the file until where you have to start completion: module ProjectStatus
  class Calculator
    def initialize(dbproj)
      @dbproj = dbproj
    end

    def calc_status(opts = {})
      return {} unless @dbproj

      mypackages = {}

      @dbproj.packages.
    
    def update_jobhistory(proj, mypackages)
      prjpacks = {}
      dname = proj.name
      mypackages.each_value do |package|
        prjpacks[package.name] = package if package.project == dname
      end

      proj.repositories_linking_project(@dbproj).each do |r|
        repo = r['name']
        r.elements('arch') do |arch|
          cachekey = "history2#{proj.cache_key_with_version}#{repo}#{arch}"
          jobhistory = Rails.cache.fetch(cachekey, expires_in: 30.minutes) do
            parse_jobhistory(dname, repo, arch)
          end
          jobhistory.each do |p|
            pkg = prjpacks[p['name']]
            next unless pkg

            pkg.set_versrel(p['versrel'], p['readytime'])
            pkg.failure(repo, arch, p['readytime'], p['verifymd5']) if p['code'] == 'failed'
          end
        end
      end
    end