How to use union types with graphql-yoga? about graphql-yoga HOT 13 CLOSED

Is there any example tackling basic union types?

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@eliperelman would you be open to adding an example via PR demonstrating how to use interfaces + unions?

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@maticzav is this helpful?:

https://github.com/eliperelman/taskcluster-graphql-server/blob/679237debc15bd055e8448d71fac78c5b2df8a88/src/graphql/Tasks.graphql#L325-L331

https://github.com/eliperelman/taskcluster-graphql-server/blob/679237debc15bd055e8448d71fac78c5b2df8a88/src/resolvers/Tasks.js#L17-L36

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@schickling I've written a medium post covering Interfaces / Unions with Prisma & Yoga. Let me know which is the best way, if any, for me to help take parts of that and add to the docs. Also if there are any additions, clarifications, errors in my post, happy to correct things.

https://medium.com/@tibotiber/graphql-interfaces-and-union-types-with-prisma-and-yoga-7224f9e1d9ad

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Thanks a lot for this great blog post @tibotiber! Would be great if you could create a PR adding an example demonstrating how to use interfaces + unions. 🙏

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Hey stale bot, you happen to be right. I think we're done here as docs has been added to cover the question. Since I opened, I'll close :). 👋

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I just ran into this too...

EDIT:

never mind... doh.

you need to provide a _resolveType function for union types

less magical than I thought but at least now it's not a mystery how it determines the type lol

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@idibidiart do you mind expending on your solution?

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When you implement your resolvers, all 'standard' keys for it are available, so fragment, resolve, __resolveType and __isTypeOf:

From https://github.com/apollographql/graphql-tools/blob/608414b0dfd2ff7ba8a27389e0bb8c400fb631c6/src/Interfaces.ts#L23-L28:

export interface IResolverOptions {
  resolve?: IFieldResolver<any, any>;
  subscribe?: IFieldResolver<any, any>;
  __resolveType?: GraphQLTypeResolver<any, any>;
  __isTypeOf?: GraphQLIsTypeOfFn<any, any>;
}

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Sorry didn’t see this before. I used __resolveType for efficient resolution. I assume isTypeOf is a hint field that has to be in the entity or API being queried but I’m not sure. I think you have to specify how to differentiate types. I’m not sure if GraphQL actually has pattern matching to resolve the different types in a Union all on its own. I don’t think that scales for long lists.

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@eliperelman this is super useful! Thanks!

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Due to inactivity of this issue we have marked it stale. It will be closed if no further activity occurs.

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