CODEWITHSUNDEEP
pythonmongodbexists
Vladimir Despotovic
Vladimir Despotovic

Reputation: 3498

In Python, how to see if the property of the object returned from MongoDB exists on that object?

I return object from the MongoDB database, using python. I want to see now if the property revokedTokens exists. This is my code:

usersCollection = db["users"]
searchQuery = { "username": username }
user = usersCollection.find_one(searchQuery)

print("user is:")
print(user)

if hasattr(user, "revokedTokens"):
    print("appending")
    user["revokedTokens"].append("another")
    #user["revokedTokens"].append(jwt)
else:
    print("adding first element")
    user["revokedTokens"] = ["first"]
    #user["revokedTokens"] = [jwt]

but I always end up in the wrong print ( print("adding first element") ) , so I don't know how to check this. Thanks everyone for correcting me, I am a python newbie!

Upvotes: 0

Views: 607

Answers (2)

balderman
balderman

Reputation: 23815

find_one returns a dict so what you need to ask is if "revokedTokens" in user or if user.get('revokedTokens') is not None

Upvotes: 1

RE6
RE6

Reputation: 2724

Generally, it is probably better practice to use the $exists MongoDB operator.

To make your code work (if you don't want to use the MongoDB query way), you should replace:

if hasattr(user, "revokedTokens"):

with

if "revokedTokens" in user:

This is because the query returns a dict object, and not a structured class

Upvotes: 1

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