Graphql: Support GraphQL resolvers that returns observables

Created on 3 Aug 2018 · 2Comments · Source: nestjs/graphql

Hi, I am new to NestJS, so I hope this issue is not my mistake. I think NestJS's GraphQL module does not support resolvers that returns observables. This is kind of unexpected as the REST counterpart (i.e. controllers) supports observables.

With heyPromise, I am able to get 'from promise'. However, heyObservable returns this instead:

{
  "data": {
    "heyObservable": "[object Object]"
  }
}

The expected data for heyObservable should be 'from rxjs'. For now, we will need to workaround by turning the observable into a promise (i.e. heyObservable_workaround_is_ok)

Snippet of schema & resolvers used:

type Query {
    heyPromise: String
    heyObservable: String
}

  @Query()
  async heyPromise () {
    return new Promise(resolve => resolve('from promise'))
  }

  @Query()
  heyObservable () {
    return of('from rxjs')
  }

  @Query()
  heyObservable_workaround_is_ok () {
    return of('from rxjs').toPromise()
  }

Source