Example returns product price and weight as null when query productById(id: '123') at localhost:4000

[rackuka]

QUERY:

{
productById(id: "123") {
id
name
price
weight
}
}

RESPONSE:

{
"data": {
"productById": {
"id": "123",
"name": "name from transformed service",
"price": null,
"weight": null
}
}
}

Steps to reprouce:

1. git clone from your repository.
2. npm install
3. npm fix audit --legacy-peer-deps
4. npm run example:watch
5. In browser go to localhost:4000 and run the query above

[jamesjenkinsjr]

@0xR any chance you have a moment to take a look at this? I suspect it might be part of the reason another repo using your work as a dependency is having issues (@graphql-mesh/transform-federation)

[0xR]

Did something change? Does the issue occur for older versions of this project?

[rackuka]

I was able to reproduce the issue on tags 2.2.0, 2.1.0, 2.0.1 by checking out corresponding version from github. Did not go to older versions though.

[jamesjenkinsjr]

Tag 1.0.0 also does not blend the two values for productById but it does appear to blend the values when querying findProduct:

query foo {
  productById(id: "123") {
    id
    weight
    name
    price    
  }
}
# Result
{
  "data": {
    "productById": {
      "id": "123",
      "weight": null,
      "name": "name from transformed service",
      "price": null
    }
  }
}

vs.

query foo2 {
  findProduct {
    id
    weight
    name
    price
  }
}
# Result
{
  "data": {
    "findProduct": {
      "id": "123",
      "weight": 100,
      "name": "name from transformed service",
      "price": 899
    }
  }
}

In fact, it seems that through tag 2.1.0 findProduct is at least blending the values from both services but on tag 2.2.0 attempting to query findProduct with any field that is sourced from the transformed-server's Product type results in an error:

TypeError: list.map is not a function",
            "    at resolveExternalList (/Users/me/Development/graphql-transform-federation/dist/delegate/src/resolveExternalValue.js:57:17)

[janhelleman]

For the list.map error, see #5 @jamesjenkinsjr. You need to set a returnType in the delegateToSchema