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: orchestration.rb
    path of file: ./repos/foreman/app/models/concerns
    
    the code of the file until where you have to start completion: require_dependency "
    
  def fail_queue(q)
    q.pending.each { |task| task.status = "canceled" }

    # handle errors
    # we try to undo all completed operations and trigger a DB rollback
    (q.completed + q.running).sort.reverse_each do |task|
      task.status = "rollbacked"
      update_cache
      execute({:action => task.action, :rollback => true})
    rescue => e
      # if the operation failed, we can just report upon it
      failure _("Failed to perform rollback on %{task} - %{e}") % { :task => task.name, :e => e }, e
    end
  end