I spent ages trying to find a simple example where MongoEngine was being used and a connection was being closed. Finally figured it out and posting my code.
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Answer
I know this is an old question, but if anyone else is searching I figured I’d give an alternate answer.
close() does not actually remove the connection from MongoEngine’s connection list. This causes problems when trying to connect to a different database later on.
To solve this I used mongoengine.connection.disconnect (even though it’s not listed in __all__). My code looks like this:
from mongoengine import connect
from mongoengine.connection import disconnect
db = connect(alias='some_alias')
{do stuff}
disconnect(alias='some_alias')
You can also leave the alias out as it will default to ‘default’ in both connect and disconnect.