code: def insert(self, **kwargs):
          
          if self.is_valid:
              before = self.before_insert()
              if before:
                  return before
  
              try:
                  self._document['_id'] = self.insert_one(self._document)
  
                  self.after_insert()
  
                  return self._document
              except PyMongoException as exc:
                  return PyMongoError(
                      error_message=exc.details.get(
                          'errmsg', exc.details.get('err', 'PyMongoError.')
                      ),
                      operation='insert', collection=type(self).__name__,
                      document=self._document,
                  )
  
          return self._errors
docs: Saves the Document to the database if it is valid.
          Returns errors otherwise.