code: def ResultCollectionForFID(cls, flow_id):
      
      # TODO: Disallow/remove URNs after migration.
      if not isinstance(flow_id, rdfvalue.RDFURN):
        flow_id = rdfvalue.RDFURN(flow_id)
  
      return sequential_collection.GeneralIndexedCollection(
          flow_id.Add(RESULTS_SUFFIX))
docs: Returns the ResultCollection for the flow with a given flow_id.
  
      Args:
        flow_id: The id of the flow, a RDFURN of the form aff4:/flows/F:123456.
  
      Returns:
        The collection containing the results for the flow identified by the id.