frames.py 文件源码

def update_many(cls, documents, *fields):
        """
        Update multiple documents. Optionally a specific list of fields to
        update can be specified.
        """
        from mongoframes.queries import to_refs

        # Ensure all documents have been converted to frames
        frames = cls._ensure_frames(documents)

        all_count = len(documents)
        assert len([f for f in frames if '_id' in f._document]) == all_count, \
                "Can't update documents without `_id`s"

        # Send update signal
        signal('update').send(cls, frames=frames)

        # Prepare the documents to be updated

        # Check for selective updates
        if len(fields) > 0:
            documents = []
            for frame in frames:
                document = {'_id': frame._id}
                for field in fields:
                    document[field] = cls._path_to_value(
                        field,
                        frame._document
                        )
                documents.append(to_refs(document))
        else:
            documents = [to_refs(f._document) for f in frames]

        # Update the documents
        for document in documents:
            _id = document.pop('_id')
            cls.get_collection().update(
                {'_id': _id}, {'$set': document})

        # Send updated signal
        signal('updated').send(cls.__class__, frames=frames)