How does one specify that a certain resolver retur...

# kgraphql

[Mattlangsenkamp]

How does one specify that a certain resolver returns I union type. I see how to define a type in the docs but not how to use it

[jeggy]

Hi, Sorry for being so inactive the latetly. I will be more active in this project soon again 🙂

I have updated the docs for union types with a bit more example code: https://kgraphql.io/Reference/Type%20System/unions/

Currently there is one common use case that is not supported which is using non sealed classes union types within query definitions. Other than this everything should work.

[Mattlangsenkamp]

I see. I am trying to return either the error or an object based on the union type above. However when I build I still get this error.

[jeggy]

these screenshots do not show where you are trying to return your union type. But by the error you are getting it seems you are using the query . Which I mentioned currently is not supported 😞

[Mattlangsenkamp]

sorry here us the full operation

[Mattlangsenkamp]

it is a mutation and I am trying to return the encodedTokens if they are not null otherwise the errorMessage

[jeggy]

Sorry I mean both query and mutation are not supported as they are both using the same DSL implementation.

Currently a workaround is required to make something like this work. Which is to change the EncodedTokens and ServerError to a Kotlin Sealed class.