Query on polymorphic types

[antonio-petricca]

Hi, I have a situation like this:

type Query {
  GetData: AbstractDataResponse
}

type AbstractDataResponse {
  field1: String!
  field2: String!
}

type DataResponseTypeA implements AbstractDataResponse {
  field3a: String!
}

type DataResponseTypeB implements AbstractDataResponse {
  field3:b String!
}

I run a query by:

{ 
  GetData {
    field3a
  }
}

The resolver, in such situation, returns an instance of DataResponseTypeA.

I get the error:

Validation error (FieldUndefined@[GetData/field3a]) : Field 'field3a' in type 'AbstractDataResponse' is undefined

How could I fix it?

Thank you so much!
Antonio

[jclyons52]

There are a number of issues with your graphql, AbstractDataResponse should be an interface, the types implementing it will need to have all the fields listed in the interface on them and there is a b after the : in DataResponseTypeB