How do you make a DataLoader available in the GraphQL context so every resolver can access it in NestJS?
Attach DataLoader instances to the GraphQL context in the GraphQLModule.forRootAsync() context factory. The factory is called per request, so each request gets a fresh loader. Resolvers access the loader via the @Context() decorator instead of injecting the loader service directly into every resolver class.
DataLoader in GraphQL context
Context-based DataLoader benefits:
Context factory is called per request — each request gets its own DataLoader instance automatically.
Avoids injecting the loader service into every resolver that needs it.
A single GqlContext interface documents all available loaders in one place.
Resolvers stay clean — access loaders via @Context() without constructor injection overhead.
Multiple loaders for different entities can all be attached to the same context object.