Mikro GraphQL Flusher

GraphQL bulk-operation solution for MikroORM in Nest.

This package internally uses AsyncLocalStorage to count mutations in requests, which may have a slight negative impact on the performance.

Installation

npm i @nestjs-devkit/mikro-graphql-flusher

Why?

The GraphQL runtime has built-in support for bulk-operations, which means you can send an array of GraphQL queries and mutations in a single HTTP request and receive an array of results.

While, in Nest, all bulk queries and mutations are handled in parallel. Therefore, when there are multiple mutations in a request, invoking em.flush() in resolvers will usually conflict and causes errors because em.flush() is not allowed to be invoked when another invoke is pending.

So how will we solve this problem? By importing the MikroFlusherModule, a global interceptor will be registered that will defer the return of each mutation after it has been handled. When all the mutations in the request have been deferred, the interceptor will invoke em.flush() to save the changes of all these mutations, and then return the results of all these mutations at once.

You can send bulk-operation requests to your GraphQL server now, and you don't need to invoke em.flush() manually any more! How wonderful!

Tutorial

As said before, the only thing we need to do is to import the MikroFlusherModule:

@Module({
  imports: [
    MikroFlusherModule,
    // ...
  ],
})
export class AppModule {}

Done! (applies to Express only)

Contributing

Pull requests are always welcome! ;]