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Internal error occurred during message handling. Please check your implementation. Error: Subscription field must return Async Iterable. Received: undefined. #405

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@alexpchin

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@alexpchin

When creating a subscription resolver as follows:

const pubsub = require('@app/lib/pubSub')

module.exports = {
  name: 'findManySubscription',
  kind: 'subscription',
  type: 'Chat',
  resolve: async payload => {
    return payload.updatePost
  },
  subscribe: async () => pubsub.asyncIterator('updatePost')
}

and adding it to:

schemaComposer.Subscription.addFields({
  chatMany: ChatTC.getResolver('findManySubscription')
})

I see the error:

Internal error occurred during message handling. Please check your implementation. Error: Subscription field must return Async Iterable. Received: undefined.

However, when adding as so:

schemaComposer.Subscription.addFields({
  chatMany: {
    type: 'Chat',
    resolve: payload => {
      return payload.updatePost
    },
    subscribe: () => pubsub.asyncIterator('updatePost')
  }
})

This is fine.

For resolvers, I am adding as per:

for (const resolver in resolvers) {
  ChatTC.addResolver(resolvers[resolver])
}

Any ideas why this wouldn't be ok?

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