Transform interfaces into possible types only

[vitramir]

Fix for issue #3253

[rtymchyk]

@trevor-scheer This is a pretty small change but fixes a big pain point with using interfaces - are you the best person to take a look?

[martijnwalraven]

@rtymchyk I'm currently looking into this and some related issues, that I suspect we'll want to fix together. I hope to have more to say on this next week.

[rtymchyk]

Thanks for the update @martijnwalraven :)

[ksaldana1]

Any update regarding these issues @martijnwalraven? We've been playing with federation a bunch at work, but some of the issues around interfaces are a bit of a blocker at the moment to fully investing. There are workarounds we can do in the meantime, but obviously that's less than ideal.

Thanks for your hard work!

[godspeedelbow]

Same here. We trying to roll this out but running into this issue.

[vitramir]

@godspeedelbow @ksaldana1 Does this PR solve your case?

[godspeedelbow]

@vitramir I don't how to test it, is there a way to easily use this PR's version of the code as a dependency so I can try it out?

[vitramir]

@godspeedelbow I've published it as @apollo-model/federation and @apollo-model/gateway

Source: https://github.com/apollo-model/apollo-server/tree/custom-package

[rtymchyk]

This PR fixes the issue for me.

[godspeedelbow]

I can confirm that this PR fixes our issue too.

@martijnwalraven any news when a fix will be shipped?

[trevor-scheer]

Closing this in favor of the PR that was just landed: #3529

Thanks again for this contribution @vitramir! We appreciate all of your help in identifying this issue and taking steps to resolve it. I've added co-authorship for you on the merge commit: 43d3ac1