private void sendMailToCollabrators(List<User> users, Resource resource, User apiCaller) {
    try {
      String flag = "";
      String collectionOrQuizTitle = "";
      Learnguide learnguide = learnguideRepository.findByContent(resource.getGooruOid());
      Assessment assessment = assessmentRepository.findQuizContent(resource.getGooruOid());
      if (resource
              .getResourceType()
              .getName()
              .equalsIgnoreCase(ResourceType.Type.CLASSPLAN.getType())
          || resource
              .getResourceType()
              .getName()
              .equalsIgnoreCase(ResourceType.Type.CLASSBOOK.getType())) {
        collectionOrQuizTitle = learnguide.getLesson();
        if (collectionOrQuizTitle == null) {
          collectionOrQuizTitle = learnguide.getTitle();
        }
        flag = COLLECTION;
      } else if (resource
              .getResourceType()
              .getName()
              .equalsIgnoreCase(ResourceType.Type.ASSESSMENT_QUIZ.getType())
          || resource
              .getResourceType()
              .getName()
              .equalsIgnoreCase(ResourceType.Type.ASSESSMENT_EXAM.getType())) {
        collectionOrQuizTitle = assessment.getName();
        if (collectionOrQuizTitle == null) {
          collectionOrQuizTitle = assessment.getTitle();
        }
        flag = "quiz";
      }
      for (User user : users) {

        mailHandler.sendMailForCollaborator(
            user.getPartyUid(),
            apiCaller.getUsername(),
            resource.getGooruOid(),
            collectionOrQuizTitle,
            flag);
      }

    } catch (Exception e) {
      e.printStackTrace();
    }
  }
 public boolean hasCollaboratorPermission(Learnguide learnguide, User user) {
   List<User> userList =
       learnguideRepository.findCollaborators(learnguide.getGooruOid(), user.getPartyUid());
   return userList.size() > 0 ? true : false;
 }