Disable cache in ApolloServer when using RESTDataSource

I am using RESTDataSource to fetch data from REST api’s but data is being cached.

How to disable cache since data keeps changing in thequery resolver.

Below is the node.js code.

   const app = express();
    
    const server = new ApolloServer({
      schema: schema,
      context: ({ req }) => ({
        token: req.headers.authorization,
      }),
      dataSources: () => apiDataSources,
    });
    
    server.applyMiddleware({ app });
    
    app.listen({ port: 4000 }, () => {
      console.log("Server is at http://localhost:4000/graphql");
    });

[MakhBeth]

In my case, the issue was not the cache of the RESTDataSource class but a wrong initialization of the dataSources inside the new ApolloServer call:

export async function getApolloServer() {
  const schema = await buildSchema()
  const dataSources = await getDataSources()
  const apolloServer = new ApolloServer({
    schema,
    dataSources:  () => dataSources,
...

This was wrong because the dataSources variable was created once, when the ApolloServer started, so the cache was common to all the requests and not only per one request.

The solution for me was to initialize a new dataSources like written inside the doc

dataSources: () => {
    return {
      moviesAPI: new MoviesAPI(),
      personalizationAPI: new PersonalizationAPI(),
    };
  },

Hope this will help someone 😃

[estevaolucas]

It’s important to remove the cache for error responses as well, otherwise you will experience unexpected results.

class NoCacheSource extends RESTDataSource {
  deleteCacheForRequest(request: Request) {
    this.memoizedResults.delete(this.cacheKeyFor(request));
  }

  didReceiveResponse(response: Response, request: Request) {
    this.deleteCacheForRequest(request);
    return super.didReceiveResponse(response, request);
  }

  didEncounterError(error: Error, request: Request) {
    this.deleteCacheForRequest(request);
    return super.didEncounterError(error, request);
  }
}