code: def insert_multiple(self, documents):
          
  
          doc_ids = []
          data = self._read()
  
          for doc in documents:
              doc_id = self._get_doc_id(doc)
              doc_ids.append(doc_id)
  
              data[doc_id] = dict(doc)
  
          self._write(data)
  
          return doc_ids
docs: Insert multiple documents into the table.
  
          :param documents: a list of documents to insert
          :returns: a list containing the inserted documents' IDs