Revert "Avoid network after incomplete optimistic cache results. (#6419)" #6493
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…)" This reverts commit 9450938. The logic of diff.optimistic needs rethinking. Any query could read from the cache at a time when optimistic updates are in progress, and that possibility should not affect the network behavior of the query. I had hoped that the dependency tracking system would serve to protect queries whose field dependencies were unrelated to the optimistic updates, but I have now observed at least one case where this hope was badly mistaken, while debugging an endless loading spinner issue with the latest versions of @apollo/client (rc3-rc.8) in the studio.apollographql.com application. As I mentioned in #6419, I was not able to reproduce the original scenario using an ordinary optimistic mutation, so I think we should wait until someone can provide a more realistic reproduction of the problem: #6419 (comment) I have left the test in place, disabled with itAsync.skip, so that we can revisit this functionality in the future.
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@benjamn what do you mean with "ordinary" optimistic mutation? What doesn't qualify https://github.com/darkbasic/gh6183/blob/master/packages/client/src/Articles.tsx#L23 as "ordinary"? |
benjamn
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I first attempted to solve this bug in #6419, but that approach was flawed, and we ultimately reverted it in #6493. Both of these changes happened shortly before the AC3 launch (rc.3 and rc.9, respectively). The key to this solution is that diff.fromOptimisticTransaction is only ever set by the InMemoryCache broadcast code, when we know that we've just performed an optimistic transaction, and we're broadcasting to a query watcher that requested optimistic data. The QueryInfo class receives this broadcast, and uses diff.fromOptimisticTransaction to decide whether to do a full reapplication of the chosen fetch policy by calling oq.reobserve(), or simply to deliver a single cache result by calling oq.observe().
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This reverts commit 9450938 (#6419).
The logic of
diff.optimisticneeds rethinking. Any query could read from the cache at a time when optimistic updates are in progress, and that possibility should not affect the network behavior of the query.I had hoped that the dependency tracking system would serve to protect queries whose field dependencies were unrelated to the optimistic updates, but I have now observed at least one case where this hope was badly mistaken, while debugging an endless loading spinner issue with the latest versions of
@apollo/client(rc.3-rc.8) in the studio.apollographql.com application.As I mentioned in #6419, I was not able to reproduce the original scenario using an ordinary optimistic mutation, so I think we should wait until someone can provide a more realistic reproduction of the problem.
I have left the test in place, disabled with
itAsync.skip, so that we can revisit this functionality in the future.