Experiment variant re-assignment & re-fetch on device

Hi @mkuprionis - thanks for your question!

once variants are fetched for the user then they are stored locally and never re-fetched.

It’s true that the variants are stored locally, however you can call fetch() again, as many times as needed, whenever you want to get the most up-to-date variants for the user.

Example: Let’s say you are running two experiments (E1) on your landing page and (E2) on your checkout page. (E2) targeting is based on whether or not the user is logged in. Both E1 and E2 have control and treatment variants

1. User opens app for first time. On app init, experiment SDK is initialized and variants are fetch()ed for the anonymous user:  E1=treatment (since user is not logged in, user is not considered for E2 (e.g. off)
2. The user logs into their account. You instrument your app to call fetch() with the new user ID: E1=treatment , E2=control
3. User does some stuff, then purchases something and goes to checkout page where they experience the control experience for E2

In summary, you can call fetch() at different times when you need to evaluate the user again.

In your case, since the user will have updated user properties the second time you fetch, I’d recommend explicitly including the user properties in the fetch call as well:

1. fetch({user_id:"abcd",device_id:"1234"})
2. fetch({user_id:"abcd",device_id:"1234",user_properties:{property:"value"}})

Let me know if that helps!