How to get a Mongoengine s object id in a flask program

Question

Hey guys, I am using mongoengine to integrate with flask , i wanted to know how to get document object id every time i try i get File "/var/www/flask_projects/iot_mongo/app.py", line 244, in post return jsonify(user.id) AttributeError: 'BaseQuerySet' object has no attribute 'id'

class Test(Resource):
    def post(self):
        parser = reqparse.RequestParser()
        parser.add_argument('email',required=True, help='email')
        args=parser.parse_args()
        user=AdminUser.objects(email=args['email'])
        return jsonify(user.id)
api.add_resource(Test,'/test')

if __name__ == '__main__':
    app.run(debug=True) 

Answer 1

Check out the documentation, Document.objects is a QuerySet object.

You seem to be expecting that this part of your code

user=AdminUser.objects(email=args['email']) # user will be a QuerySet

will give you a single result, which is not the case, it will give you a QuerySet with zero or more results. It does not have an attribute id, this is why you get the error message you are seeing when you try to access this attribute here:

return jsonify(user.id) # QuerySet does not have the attribute id

You need to fetch the actual result(s) you want from it, assuming you are sure your query will return a single result, or do not care that there might be more than one result and just want the first one, you probably want something along these lines:

user=AdminUser.objects(email=args['email']).first() # extract first result
return jsonfiy(user)

Alernatively, returning all results would look like this:

users=AdminUser.objects(email=args['email']).all() # extract all results
return jsonfiy(users)