The InMemoryCache feature of Apollo quietly discards data associated with fragments that are declared on the main

After sending the following query to my GraphQL server:

fragment B on root_query {
    foo {
        id
    }
}

query A {
    ...B
}

The data received from the server includes the foo field. However, when I retrieve it using Apollo's InMemoryCache and either ApolloClient.query() or useQuery(), the foo field is missing.

The server-provided foo has the correct __typename and id.

I was expecting to find the contents of fragment B in result.data, but they are not present and no errors or warnings are returned.

If I manually include the fragment in the query, everything works as expected.

typescriptgraphqlapollo-client

Answer №1

When the root query is given a custom name in the server schema (such as root_query), it must be explicitly defined in the cache settings as shown below:

new ApolloClient({
    cache: new InMemoryCache({
        typePolicies: {
            query_root: { queryType: true }
        }
    })
    // Other options...
})

If not done, Apollo will mistakenly interpret the fragment usage and silently ignore the data.

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