Cache Redirect not causing query to run on partial data when using lists

Intended outcome: Query should be sent to the server to receive the missing reference

Actual outcome: Query not sent to server and I get no data

How to reproduce the issue:

1. Create a query that fetches a list of items based on a condition:

items(where: { id: $id }) {
    ...CoreItemFields
  }

This will return [item]

1. Create a cache redirect to the query

new InMemoryCache({
        typePolicies: {
            Query: {
                fields: {
                    items: {
                        read(_, { args, toReference }) {
                            if (!!args.where?.id) {
                                return [toReference({ __typename: "Item", id: args.where.id })];
                            }
                        }
                    }
                }
            }
        }
    }

If you run a query that queries items that do not exist in the cache, the read function will run, returning a list of 1 reference as expected. But since the reference references to something that does not exist in cache, the query should run. But it doesn’t.

Versions System: OS: macOS 12.0.1 Binaries: Node: 14.18.1 - ~/.nvm/versions/node/v14.18.1/bin/node Yarn: 1.22.15 - ~/.yarn/bin/yarn npm: 6.14.15 - ~/.nvm/versions/node/v14.18.1/bin/npm Browsers: Chrome: 95.0.4638.69 Safari: 15.1 npmPackages: apollo-server-express: ^3.3.0 => 3.4.0

[sebastienva]

Same here since we upgraded to 3.x (no issue in 2.x), but I use a workaround. If one ref is missing from cache, I disable the cache redirect to trigger the query.

Something like that :

read(_, { args, toReference, canRead }) {
   if (!!args.where?.id) {
     const refs =  [toReference({ __typename: "Item", id: args.where.id })];

     if (refs.find(ref => !canRead(ref))) {
       return undefined;
     }

     return refs;
  }
}

I hope this can help.

[dylanwulf]

I think I ran into this same problem here: https://community.apollographql.com/t/apollo-inmemory-cache-type-policy-for-query-with-list-of-ids-as-argument/1989