code: def replace(cls, obj, field, value, state):
          
          if not hasattr(obj, field):
              raise ValidationError("Field '%s' does not exist, so it cannot be patched" % field)
          setattr(obj, field, value)
          return True
docs: This is method for replace operation. It is separated to provide a
          possibility to easily override it in your Parameters.
  
          Args:
              obj (object): an instance to change.
              field (str): field name
              value (str): new value
              state (dict): inter-operations state storage
  
          Returns:
              processing_status (bool): True