code: def is_all_field_none(self):
          
  
          if self._id_ is not None:
              return False
  
          if self._description is not None:
              return False
  
          if self._ean_code is not None:
              return False
  
          if self._avatar_attachment is not None:
              return False
  
          if self._tab_attachment is not None:
              return False
  
          if self._quantity is not None:
              return False
  
          if self._amount is not None:
              return False
  
          return True
docs: :rtype: bool