Federation plugin: Unable to get parent resolved entity on field that uses @requires directive

[Rtwena]

Hi, I created a public repo to highlight the issue I'm having https://github.com/Rtwena/pothos-federation-example

I'm struggling to get a parent resolved entity of cart when trying to resolve Cart.canCheckout which uses the @requires directive. At this point of the code cart only contains { id: string, lineItemsStock: LineItemStock[] }. However, I expect it to contain the resolved cart query from it's own service, as well as { lineItemsStock: LineItemStock[] } from the stock service.

Specifically the data that canCheckout requires that is missing is the cart.lineItems, which is resolved by the cart service. I cannot add lineItems to the @requires directive, because then I would need to make lineItems @external, which would be invalid schema.

The flow of data should be as follows when querying for Cart

query Cart($cartId: String!) {
  cart(cartId: $cartId) {
    lineItemsStock {
      stock
      sku
    }
    id
    lineItems {
      id
      productId
      sku
      quantity
    }
    canCheckout
  }
}

Expected:

1. Cart service resolves query Cart, returns cart data including lineItems
2. Stock service resolves Cart.lineItemsStock, using lineItems from the cart service. returns lineItemsStock data
3. Cart service resolves Cart.canCheckout, using lineItemsStock from the stock service, as well as parent cart data from the initial query resolver

Actual:
At step 3, the parent cart data is missing, the resolver does not have access to cart.lineItems. It only has { id: string, lineItemsStock: LineItemStock[] }

This flow does work when not using pothos to generate the resolvers and using the exact same graphql schema.

For context, I'm working on converting an existing federated graph to pothos.

[Rtwena]

I'm actually going to close this for now. I just tried on another example without pothos and got the same result. So I must be using federation incorrectly.