Unknown field "_service" on type "Query".

[rkudryashov]

After update to latest 4-th version, it seems that enable_federation method (https://github.com/rkudryashov/graphql-rust-demo/blob/master/auth-service/src/lib.rs#L54) doesn't force generation of _service entry point. This is needed for services that don't have Federation stuff/distributed types, but nevertheless are used as downstream service behind Federation gateway.

Expected Behavior

{
  _service {
    sdl
  }
}

Returns SDL

Actual Behavior

Request above returns:

{
  "data": null,
  "errors": [
    {
      "message": "Unknown field \"_service\" on type \"Query\".",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ]
    }
  ]
}

[KevinXdefi]

Any idea how to solve this ?

EDIT: found a workaround, you have to declare at least one entity in your query

[sunli829]

Thank you @rkudryashov , I have fixed it. 🙂