'Given a path (mapper A, prop X), replace the prop with the wildcard,
e.g. (mapper A, \'relationship:.*\') or (mapper A, \'column:.*\'), then
return within the ("loader", path) structure.'

@util.memoized_property
def _wildcard_path_loader_key(self):

    return ('loader', self.parent.token(('%s:%s' % (self.prop.strategy_wildcard_key, _WILDCARD_TOKEN))).path)
