GraphQL errors are ignored when using pollInterval

[fungiboletus]

Describe the bug

GraphQL errors returned by the server after the first request are ignored when using pollInterval.

To Reproduce
Steps to reproduce the behavior:

1. Write a apollo query using pollInterval
2. The server should return a successful result the first time.
3. The server returns a graphql error the second time.
4. The error is ignored

Expected behavior

The graphql error should not be ignored. Network errors, if you stop the graphql server for example, are not ignored. If the error occurs for the first query, before it waits to poll, it's not ignored either.

Versions
vue: 2.6.12
vue-apollo: 3.0.5
apollo-client: 2.6.10

[Akryum]

Could you please provide a runnable minimal reproduction of this so I can take a look when I have some time? Thanks! 🙏

[fungiboletus]

Sure, I will hopefully get some time for that next year. 🙂

[yrd]

Hi, I ran into this problem as well. It seems that any error from a previous fetch is kept in cache, even if later calls to the GraphQL server don't return any errors anymore. The changes in #1120 seem to fix it for me... @fungiboletus Could you check if this solves it?

[fungiboletus]

Could you check if this solves it?

I'm using the V3 and your change is for the V4. I checked and the code looks quite different. Actually my bug may not exist in the V4.

[yrd]

Oh sorry, my bad 🙈