code: def reload(self, *fields, **kw):
  		
  		
  		Doc, collection, query, options = self._prepare_find(id=self.id, projection=fields, **kw)
  		result = collection.find_one(query, **options)
  		
  		if fields:  # Refresh only the requested data.
  			for k in result:  # TODO: Better merge algorithm.
  				if k == ~Doc.id: continue
  				self.__data__[k] = result[k]
  		else:
  			self.__data__ = result
  		
  		return self
docs: Reload the entire document from the database, or refresh specific named top-level fields.