def METHOD_NAME(self, builderid):
    if builderid in self.builders:
        masterids = [bm[1] for bm in self.builder_masters.values()
                     if bm[0] == builderid]
        bldr = self.builders[builderid].copy()
        bldr['masterids'] = sorted(masterids)
        return defer.succeed(self._row2dict(bldr))
    return defer.succeed(None)