禁止PropertyPublisherMeta记录所有子类的字段信息

Properties.py

class PropertyPublisherMeta(type):
    """A metaclass that associates subclasses with Storm L{PropertyRegistry}s.
    """

    def __init__(self, name, bases, dict):

        if not hasattr(self, "_storm_property_registry"):
            self._storm_property_registry = PropertyRegistry()
        elif hasattr(self, "__storm_table__") and hasattr(self, "__refbyname__"):
            refbyname = getattr(self, "__refbyname__")
            if refbyname:
                self._storm_property_registry.add_class(self)