Federation: Error when returning Query type from Mutation

[ksaldana1]

Reproduction: https://github.com/ksaldana1/provides-fed-repro/tree/query-root-failure

Issue: It is common to return the query type inside of a mutation return payload to be flexible to the downstream consumers and the type of fresh data they want from a mutation response. I have tried to implement this using a federated gateway (simple example in repro repo above), and am running into errors at the gateway level (buildQueryPlan.js specifically).

When running a simple query such as:

mutation {
  echo(input: "Hello World!") {
    message
    query {
      kitchen(id: "1") {
        id
      }
    }
  }
}

The gateway is erroring out with "message": "Couldn't find base service for type \"Query\"",. Perhaps I'm missing something in configuration of the root query object, but I was wondering if this functionality should be working.

Thanks again for your hard work!

[jbaxleyiii]

@ksaldana1 This is definitely not something we support yet! The query planner will need to "restart" at the query level to make this work. Definitely something we want to support

[ksaldana1]

Thanks for the heads up @jbaxleyiii ! I figured as much, but thought I'd ask. Not a game-breaker and definitely doesn't trump the value proposition of federation. Plenty of other more important things to address first—my ultra flexible mutation payloads can wait a bit.

Feel free to close this issue if you plan to put it on some greater roadmap. Thanks again to you and your team for all the effort you've put into this. Excited to see what the future holds.

[jbaxleyiii]

@ksaldana1 I'm going to move this to our feature-requests repo!

[amatiushkin]

any updates on this one?

[mwinstanley]

+1 another request for this feature - any additional updates?

[nicolas6422]

+1 Looking for an update 🙏