Pymongo：如何获得特定领域的价值

Question

I have the document below. I would like to get the topic field if the password matches.

email: "info@info.com"
first_name: "james"
password: Binary('HcM0Js5Pqh8oGZxLSNuMJNgb5l1WUCn5NRhB/L4juIY=')
surname:"mcarthy" topic: "journalism"

I am using below code to check if the key exists.

    user = user_in_db.find_one({'password': key})
    if user is None:

How can i retrieve the topic field if the user does exist?

Answer 1

That is very simple. As per this official tutorial , the return of find_one is a dictionary, hence you could do something like:

user = user_in_db.find_one({'password': key})
if user:  # check if user exists
    topic = user['topic']