def rename(cache: TwinKeyDict, existing: str, desired: str):
block = cache.get((existing, None))
if block: # pragma: no cover
del cache[existing, None]
block['id'] = desired
cache[desired, block['nid']] = block
def get(cache: TwinKeyDict, ids: dict) -> Optional[dict]:
return cache.get((ids.get('id'), ids.get('nid')))