receivers.py 文件源码

def update_history(instance, **kwargs):
    if instance.body != instance.db_body \
            or instance.layout != instance.db_layout \
            or instance.subject != instance.db_subject:
        instance.version += 1

    if instance.version != instance.db_version:
        version = instance.version

        @transaction.on_commit
        def save():
            instance.history.create(
                version=version,
                body=instance.body,
                subject=instance.subject,
                layout=instance.layout,
            )