How to find the list of active user based on the session in mongo db collectiom

[Soorya Prakash]

Hi,

 I am having the list of users id and i need ti find the active users from the list in session collecction by passing the list of user ids. The session collection lokks like below

{

"_id" : "sXfI3vMxkZzsTkxuovUFONYA",

"session" : "{\"cookie\":{\"originalMaxAge\":14399998,\"expires\":\"2015-03-28T17:24:18.996Z\",\"secure\":true,\"httpOnly\":true,\"path\":\"/\"},\"lastAccess\":1427549058996,\"dbname\":\"abc\",\"userid\":\"54f5bfb0336a15084785c379\"}",

"expires" : 1427563458000

}

{

"_id" : "sXfI3vMxkZzsTkxuovUFONYB",

"session" : "{\"cookie\":{\"originalMaxAge\":14399998,\"expires\":\"2015-03-28T17:24:18.996Z\",\"secure\":true,\"httpOnly\":true,\"path\":\"/\"},\"lastAccess\":1427549058996,\"dbname\":\"abc\",\"userid\":\"54f5bfb0336a15084785c371\"}",

"expires" : 1427563458000

}

{

"_id" : "sXfI3vMxkZzsTkxuovUFONYC",

"session" : "{\"cookie\":{\"originalMaxAge\":14399998,\"expires\":\"2015-03-28T17:24:18.996Z\",\"secure\":true,\"httpOnly\":true,\"path\":\"/\"},\"lastAccess\":1427549058996,\"dbname\":\"abc\",\"userid\":\"54f5bfb0336a15084785c370\"}",

"expires" : 1427563458000

}

I am user id list like ["54f5bfb0336a15084785c379","54f5bfb0336a15084785c371"] as "userList".

I am querying like db.sessions.find({"session.cookie.userid":{$in:userList}}) and i am getting null as result.

When i query like below i am able to get the result.

db.sessions.find({"session":/54f5bfb0336a15084785c379/})

But i need to find the list of active users from the users list listing node js mongodb client. Can anyone help me in this please? 

[Will Berkeley]

The value of the session key is a string representation of an embedded object, not an actual embedded objects - that's why an $in query for subfields of an embedded object

db.sessions.find({ "session.cookie.userid" : { "$in" : userList } })

is not returning results, while a regex match

db.sessions.find({ "session" : /54f5bfb0336a15084785c379/ })

is returning results. It's essentially the same problem as storing the string "4" when you meant to store the object 4. How are you inserting or importing the data? You'll want to fix it so the sessions field gets a value that is an object, not a string.

-Will

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[Soorya Prakash]

Hi,

 I am using the express js session handler to store the session. I am inserting the userid while saving the session.Is there any way to achieve the query with existing db structure? or otherwise if i use the below  query as a iteration.

db.sessions.find({"session":/54f5bfb0336a15084785c379/}) like this. Then please tell me how i can i execute in node js .

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[Will Berkeley]

Can you show us a bit of code to show how you're storing the session with express? I'm guessing you receive a json string and aren't parsing it before you store it the session field.

-Will

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[Soorya Prakash]

Hi,

function (req, res, next) {

        req.session.cookie.maxAge = 28 * 24 * hour; //4 weeks

   

      //Add the dbname in session for accessing the client database respectively

      req.session.dbname = dbname;

      //Add the session user id of inner company database for future api calls from inner datatabse

        req.session.userid = dbUser._id.toString();

         req.session.save(function (err) {

              if (err) {

                   res.send("Internal error saving session: " + err.message, 500);

              } else {

                  res.send(200);

              }

        });

}

like this when i doing the user login.