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# announcements
w
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f
Hi Rodolfo, by registration date, do you mean when they were enrolled into the experiment?
r
Nope, the date he registered in our system
f
are you able to set that date in the SDK?
as one of the user attributes?
r
Yes I am, this is exactly why I asked here, can I use user attributes in dimensions? So far I thought I could only use event attributes
f
yes, so as a user attribute it can be used as the randomization unit. To use it as a dimension, you will need to get that attribute from your data warehouse. (or you can pass it in with the experiment tracking callback)
r
Hmm I do not get exactly how, right now we use mixpanel and I am able to set this as an user attribute in growthbook. What you mean is that in mixpanel I will somehow have to pass this as an event attribute for all events?
f
not for all events - let me check for mixpanel
okay
do you have the registration date already in mixpanel?
r
Not yet
f
When you create a dimension in GrowthBook under the analysis section, for mixpanel, you use the javascript query language they have to pull that value.
you can do something like this:
Copy code
(() => {
    // event
    let regDate = "none";
    for (let j = 0; j < events["length"]; j++) {
        if (events[j].properties["registrationDate"]) {
            regDate = events[j].properties["registrationDate"];
            break;
        }
    }

    return regDate;
})()
r
But this is what I mentioned earlier, from the docs it looks like I can only use event properties not user attributes. But is it possible to get the user attribute there from the event?
f
we don’t automatically pass in the user attributes in the tracking call
but you can add additional parameters in it, and use that
r
so I would have to add to every single event?
f
no, I don’t believe so
just the experiment track callback one should be enough
r
I see, the tracking call back, but that one is done for example in a moment the user is not yet registered so there is not date to send
f
do you fire an event when the user does register? That seems like something you should have anyway
r
we do, but can I use one event alone to create a dimension for all events? We do have a signup event already
f
I’d have to check with jeremy - but you should be able to test it out pretty easily
r
Any updates? 😅
f
@future-teacher-7046 Can you confirm?
f
We don't currently support user properties in Mixpanel, but it's something we have talked about adding. I'll make a GitHub issue for it.
r
Thank you @future-teacher-7046
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