How do you pass parent request arguments to @resolveTo source arguments in a schema extension?

[madolala]

Hello,

I don't know how to pass the 'id' argument of my main query “getPartner(id: 110)” which won't have a partnerId or similar field in the response to the 'mdmid' argument of the extended field coverages.

I haven't seen any examples of this in the documentation.

additionalTypeDefs: `
    extend type moralPerson {
        coverages(from: String!, to: String!, system: String): getCoverages_response @httpOperation(...)
        @join__field(graph: COVERAGES)
        @resolveTo(
            sourceName: "Coverages",
            sourceTypeName: "Query",
            sourceFieldName: "getCoverages",
            sourceArgs: {
                mdmId: "{root.id}", # => ❌ NOT WORKING
                from: "{args.from}",
                to: "{args.to}",
            },
        )
    }

[ardatan]

You need to add requiredSelectionSet;

  extend type Book {
    author: authors_v1_Author @resolveTo(
      sourceName: "Authors"                                   # Which source does the target field belong to?
      sourceTypeName: "Query",                                # Which root type does the target field belong to?
      sourceFieldName: "authors_v1_AuthorsService_GetAuthor", # What is the source field name?
      requiredSelectionSet: "{ authorId }",                   # What is the required selection on the target type to resolve the source field?
      sourceArgs: {                                           # What args the source field does need?
        input: {
          id: "{root.authorId}"
        }
      }
    )
  }

[madolala]

Tanks for your quick response, but in my case the 'id' is not in the response of the parent object, but in parameter of the query. I tried to add requiredSelectionSet but it dindn't work. Here is my full query :

  getPartner(id: "110") { // i want that "110" value in coverages mdmId argument
    partnerType
    ... on moralPerson {
      legalForm
      radiationType
      name
      coverages(to: "2099-12-31", from: "2017-06-10") {
        ... on coverage {
          mdmId
          subscribedProducts {
            billingFrequency
          }
        }
      }
    }
  }
}

[ardatan]

It is not possible currently. id should be part of moralPerson in order to make it work.

[madolala]

Ok thank you. Would it help if I made a ticket in the Ideas / features topic?

[ardatan]

You can create an issue! Thanks!

[PlayAnyData]

You might be able to do so by using programmatic additional resolvers. E.g. (non-working sample as I have removed parts of the logic)

  return {
    selectionSet,
    resolve(root, args, context: GatewayContext, info) {
      let key = keyExtractor ? keyExtractor(root, typeUpper) : args.yourArg;

      return batchedConnectionQuery({
        root,
        context,
        info,
        key,
        argsFromKeys: function (ids: string[]) {
          return { ...args, parentIds: ids };
        },
        // Function to extract the result from the batched response
        valuesFromResults: (data) => {
          return data;
        },
      });
    },
  };
}