def alter_object(self, obj):
        """
        Alters all the attributes in an individual object.

        If it returns False, the object will not be saved
        """
        for attname, field, replacer in self.replacers:
            currentval = getattr(obj, attname)
            replacement = replacer(self, obj, field, currentval)
            setattr(obj, attname, replacement)
Alters all the attributes in an individual object.

        If it returns False, the object will not be saved