Tips for effectively managing loading and partial states during the execution of a GraphQL query with ApolloClient

I am currently developing a backend application that collects data from GraphQL endpoints using ApolloClient:

const client = new ApolloClient({
    uri: uri,
    link: new HttpLink({ uri: uri, fetch }),
    cache: new InMemoryCache({
        addTypename: false,
    }),
});

When I utilize the query function:

client.query({
    query: query,
    variables: vars,
    fetchPolicy: "no-cache",
})

An ApolloQueryResult object is returned:

ApolloQueryResult<T> = {
    data: T;
    errors?: ReadonlyArray<GraphQLError>;
    error?: ApolloError;
    loading: boolean;
    networkStatus: NetworkStatus;
    partial?: boolean;
}

I'm having difficulty understanding how to manage the loading and partial states as the documentation does not provide clear instructions. Since I am not utilizing React, I am uncertain if these states are relevant only for frontend operations.

Through testing, I have noticed that both partial and loading always remain undefined regardless of the endpoint being called. Is there a correct way to handle these states within a node environment? Could it be possible for them to not be undefined?

Answer №1

I have always wondered about this, so I decided to investigate further.

loading: [can be disregarded] When you call the query method on ApolloClient, it does not set result.loading to true. This behavior is handled by the front-end React useQuery hook instead, as its purpose is to assist with UI rendering.

partial: [varies] The definition of ApolloQueryResult can be found in the source at this link. It contains a note that states: "If result.data was read from the cache with missing fields, result.partial will be true...". This indicates that your client utilizes a cache, but the query specifies a no-cache policy.

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