docs: def trigger(self, event, filter=None, update=None, documents=None, ids=None, replacements=None):
          """ Trigger the after_save hook on documents, if present. """
  
          if not self.has_trigger(event):
              return
  
          if documents is not None:
              pass
          elif ids is not None:
              documents = self.find_by_ids(ids, read_use="primary")
          elif filter is not None:
              documents = self.find(filter, read_use="primary")
          else:
              raise Exception("Trigger couldn't filter documents")
  
          for doc in documents:
              getattr(doc, event)(update=update, replacements=replacements)