mongodb

最新推荐文章于 2024-11-26 18:40:05 发布

原创最新推荐文章于 2024-11-26 18:40:05 发布 · 436 阅读

0 ·

CC 4.0 BY-SA版权

本文介绍如何在Python中将字符串形式的ObjectId转换为ObjectId类型，并使用该类型进行文档查询。常见应用场景是从URL获取ObjectId并查找相应的文档。

Note that an ObjectId is not the same as its string representation:

>>> post_id_as_str = str(post_id)
>>> posts.find_one({"_id": post_id_as_str}) # No result
>>>

A common task in web applications is to get an ObjectId from the request URL and find the matching document. It’s necessary in this case to convert the ObjectId from a string before passing it tofind_one:

from bson.objectid import ObjectId

# The web framework gets post_id from the URL and passes it as a string
def get(post_id):
    # Convert from string to ObjectId:
    document = client.db.collection.find_one({'_id': ObjectId(post_id)})