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https://github.com/RevenueCat/purchases-ios
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Toni Rico
fdd79cdcb0
### Description Deals with [SDK-2817](https://linear.app/revenuecat/issue/SDK-2817/fix-issue-with-missing-subscriber-attributes-on-purchases-[ios]) This is the iOS counterpart to https://github.com/RevenueCat/purchases-android/pull/809 There was an issue where subscriber attributes could be delayed to be synced to the backend. This happened when setting a subscriber attribute AFTER the `logIn` call but BEFORE the `logIn` operation was completed. This issue happens because we start syncing subscriber attributes immediately when calling `logIn`, but if we set any after that but before the login is complete, they will be assigned to the old user id. We would sync those the next time the app is backgrounded/foregrounded but might be missed if there is a purchase before that happens. When there is a purchase, we only sync the current user's unsynced attributes, but not attributes of other users. This PR copies all unsynced attributes from the old user id to the new one upon a successful login. This way, the unsynced attributes will be sent if the user tries to purchase. Note that we only copy these attributes when the old user id was anonymous. This is because there is a possible edge case of copying attributes from a user to a different user if the sync request fails and remains unsynced when changing between user ids.