How to sync data in widget?

[Mr-ZNN]

My project has added widget. Without the need to open the app, the data needs to be updated synchronously when the widget is updated, so I created a synchronizer in both the app and the widget, or created a synchronizer in a singleton class to give app and widget use. However, after the widget is synchronized, opening the app and synchronizing the realm in the app will report the following error：
*** Terminating app due to uncaught exception 'RLMException', reason: 'Attempting to create an object of type 'GroupMessage' with an existing primary key value 'D2CB7AB4-D505-4568-83D1-CBA8EB28408B'.'

[aehlke]

did you figure it out? this is worrisome

[mentrena]

Hey, would need more information to possibly look into this. Things like snippets, a description of your flow, a description of how many Realms you're using and where you're storing...
Generally it's a bad idea to create more than one synchronizer in your app for the same Realm store –still, not sure if that's what you're even doing.

[aehlke]

I also just ran into this with a UUID PK. I'm looking into it.

[aehlke]

First off I see that IceCream treats insertions and modifications to the realm db the same: https://github.com/caiyue1993/IceCream/blob/0b6b24a4eddc331361f3123eab48ef116b123161/IceCream/Classes/SyncObject.swift#L136-L149 whereas SyncKit treats them specially. I think this may be a mistake and source of a race condition or similar issue

[aehlke]

I've fixed it with defensive coding in my fork, BigSyncKit: lake-of-fire/BigSyncKit@c2d9e18

I collapsed .new and .changed into .newOrChanged and then allowed the realm.add to update an existing object at the site of the crash.