使用 Python 使用字符串查询 MongoDB 的 _id 的正确方法是什么？
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What is the correct way to query MongoDB for _id using string by using Python?
提问by MFB
I am using pymongo driver. Supposedly, one can use a string to query the _id field of a document, like this:
我正在使用 pymongo 驱动程序。据说，可以使用字符串来查询文档的 _id 字段，如下所示：
thing = db.things.find_one({'_id':'4ea113d6b684853c8e000001'})
But it doesn't work. What am I doing wrong?
但它不起作用。我究竟做错了什么？
回答by DhruvPathak
It should be :
它应该是 ：
from pymongo.objectid import ObjectId
thing = db.things.find_one({'_id': ObjectId('4ea113d6b684853c8e000001') })
EDIT:
The current import is:
from bson.objectid import ObjectId
编辑：当前的导入是：
from bson.objectid import ObjectId
回答by Sean
PyMongo has changed its structure. ObjectIDis no longer imported from pymongo, but from bson. It should now be:
PyMongo 已经改变了它的结构。ObjectID不再从 导入pymongo，而是从bson. 现在应该是：
from bson.objectid import ObjectId
thing = db.things.find_one({'_id': ObjectId('4ea113d6b684853c8e000001')})
As a reminder, per pypi/pymongo, do not install the “bson” package. PyMongo comes with its own bson package; doing “pip install bson” installs a third-party package that is incompatible with PyMongo.
提醒一下，对于pypi/pymongo，不要安装“bson”包。PyMongo 自带 bson 包；执行“pip install bson”会安装与 PyMongo 不兼容的第三方包。
回答by Jigyasu Tailor
To print it:
要打印它：
import pymongo
from bson.objectid import ObjectId
print(db.things.find_one({'_id': ObjectId('4ea113d6b684853c8e000001')}))
if you don't want to print, store in other variable
如果您不想打印，请存储在其他变量中
回答by lobster1234
thing = db.things.find_one({'_id':ObjectId('4ea113d6b684853c8e000001')})should work
thing = db.things.find_one({'_id':ObjectId('4ea113d6b684853c8e000001')})应该管用
回答by Karthik Gomadam
PyMongo documentation does not seem to be in sync with the current version. ObjectIds are now under bson.objectid namespace. If I remember right, they have been that way since version 2.3. Use from bson.objectid import ObjectId.
PyMongo 文档似乎与当前版本不同步。ObjectIds 现在在 bson.objectid 命名空间下。如果我没记错的话，它们从 2.3 版开始就是这样。使用 from bson.objectid 导入 ObjectId。
