code: def clear(self, models=(), commit=True):
          
          if not models:
              # Because there does not appear to be a "clear all" method,
              # it's much quicker to remove the contents of the `self.path`
              # folder than it is to remove each document one at a time.
              if os.path.exists(self.path):
                  shutil.rmtree(self.path)
          else:
              database = self._database(writable=True)
              for model in models:
                  database.delete_document(TERM_PREFIXES[DJANGO_CT] + get_model_ct(model))
              database.close()
docs: Clear all instances of `models` from the database or all models, if
          not specified.
  
          Optional Arguments:
              `models` -- Models to clear from the database (default = [])
  
          If `models` is empty, an empty query is executed which matches all
          documents in the database.  Afterwards, each match is deleted.
  
          Otherwise, for each model, a `delete_document` call is issued with
          the term `XCONTENTTYPE<app_name>.<model_name>`.  This will delete
          all documents with the specified model type.