code: func JobToSelectableFields(job *batch.Job) fields.Set {
  	objectMetaFieldsSet := generic.ObjectMetaFieldsSet(&job.ObjectMeta, true)
  	specificFieldsSet := fields.Set{
  		"status.successful": strconv.Itoa(int(job.Status.Succeeded)),
  	}
  	return generic.MergeFieldsSets(objectMetaFieldsSet, specificFieldsSet)
  }
docs: // JobSelectableFields returns a field set that represents the object for matching purposes.