docs: def next_id(self, subfolder):
          """
          ProjectFileEvent Write to File Method
          """
          evt_sim_folders = self.events.filter(
                          ProjectFileEvent.subfolder
                              .like("{0}_%".format(subfolder))
                      )
          max_id = 0
          num_search = re.compile(r'{0}_(\d+)'.format(subfolder), re.IGNORECASE)
          for prj_event in evt_sim_folders:
              found_num = num_search.findall(prj_event.subfolder)
              if found_num is not None:
                  max_id = max(max_id, int(found_num[0]))
          return max_id + 1