value.py 文件源码

def delete(self, values):
        """Delete L{TagValue}s.

        @param values: A sequence of C{(objectID, Tag.path)} 2-tuples to
            delete values for.
        @raise FeatureError: Raised if the given list of values is empty.
        @return: The number of values deleted.
        """
        if isgenerator(values):
            values = list(values)
        if not values:
            raise FeatureError("Can't delete an empty list of tag values.")

        paths = set([path for objectID, path in values])
        objectIDs = set([objectID for objectID, path in values])
        tagIDs = dict(getTags(paths).values(Tag.path, Tag.id))
        values = [(objectID, tagIDs[path]) for objectID, path in values]
        result = getTagValues(values).remove()
        if result:
            touchObjects(objectIDs)
        return result