code: def _delete(self, pk):
          
          item = self.datamodel.get(pk, self._base_filters)
          if not item:
              abort(404)
          try:
              self.pre_delete(item)
          except Exception as e:
              flash(str(e), "danger")
          else:
              if self.datamodel.delete(item):
                  self.post_delete(item)
              flash(*self.datamodel.message)
              self.update_redirect()
docs: Delete function logic, override to implement different logic
              deletes the record with primary_key = pk
  
              :param pk:
                  record primary key to delete