Mutation that goes out during an existing re-fetch caused by invalidation, doesn't trigger another invalidation

[scwood]

TL;DR, a mutation causes a cache invalidation which triggers a re-fetch. If another mutation happens before the re-fetch finishes, a second re-fetch isn't triggerd, and the returned value ends up being stale, because it doesn't account for the second mutation. Is this expected? Is there a way around this? Details and codesanbox and etc. below.

We're running into a quirk with cache invalidation, and I wonder if someone has advice or insight.

Imagine the following endpoints:

• getColor: returns the current color value
• updateColor: updates the current color value

getColor, provides the ['Color'] tag, and updateColor, invalidates that tag

The problem we're running into is: a user updates the color, the re-fetch is triggered. Before the re-fetch finishes, the user updates the color again. When the original re-fetch finishes, it comes back with the wrong color value, because the user has made a new change that wasn't accounted for. A second re-fetch wasn't triggered I assume because one was already in progress. What are we supposed to do in such a scenario? Ideally, I think I'd want to force another refetch to happen, after the second mutation, rather than it being ignored.

Here's a codesandbox link for what I'm talking about: https://codesandbox.io/s/vigorous-sunset-tyu1mz?file=/src/store.ts

And Here's a gif showing the scenario. I show it working normally changing the color between blue, and then red. Then I show what happens when the user changes the color, then changes the color again after the re-fetch has started from the cache invalidation.

[markerikson]

This sounds like it might be the same issue as #2203 and #3105 ?

Also see this potential PR:

• Delayed tag invalidations #3116

[scwood]

#3105 does sound similar, and that PR does seem promising as a solution!

I suppose close this as duplicate or however you would like to handle it. Thanks for the links, we'll keep an eye on the release.