GraphQL Unions Tutorial

[@_patrickisaac]

From a junior dev perspective: I watched this video about a few months back and sort of understood it and I re-watched it again today and it makes complete sense. I just wanted to take the time to say thank you so much for this, Ben!

[@akasadulloh3393]

O men thank you so much. It's hard to find docs about union types usage. It's very helpful!

[@prvnbist]

Hey, Really nice tutorial about Union Types. Could you also do one for Enums whenever it's convenient for you?

[@bawad]

sure

[@sanchito59]

Great video, thanks for this!

[@sasonbraha4599]

Awesome video! thanks.

[@kamleshshete6948]

Thanks for the tutorial and I watched many other Ur tutorial ..... Great work .Thank you very much Ben I have one question can we give multiple scalar type for fields in schema Like type user name : Int I String l Date } Is it possible to give multiple scale types ???

[@kamleshshete6948]

And my second question is Graphql is it have really have performance and other benefits over rest API for small applications with 1k or 10k users ? And many cases need third party library support , ex: for file upload We can't test directly from GraphQL playground need to install some third party library ?

[@iljushka7198]

Used it once for search feature

[@yoyo26-34]

Hi, thks but I guess it would me more powerfull if the union type returns the same fields names whatever the error type is triggered. Would be much easier on the client side to manager the errors. All in all this is all about standardizing the errors signatures thks ben

[@akashrajpurohit97]

What would you do while implementing the client side of it. Because you are not sure whether you will get an error object with reason or with field key on it. Would you have to keep a check something like if(err && err.field) validationErrorRes if(err && err.reason) timeoutErrorRes Something like this or different sol?

[@bawad]

yes or you can check the __typename

[@akashrajpurohit97]

@@bawad Cool

[@anikethsaha5064]

Can they b used for auth? Like if my auth attempt is correct then return the user else the error?...

[@bawad]

yes

[@natture]

how is that toggling happing can anyone tell i

[@bawad]

Toggling between screens? That's control + left or right arrow key on mac

[@riginoommen]

How to use unions with input types

[@AsifIqbalR]

You can't.

[@franciscobanda5213]

Hi Ben, How would I structure my resolvers const for the following scenario? My schema looks likes this: const schema = gql ` type Query { search(text: String!): [SearchResults!] union SearchResults = User | Transaction | Message type User { logonID: ID! fullName: String! surName: String! } type Transaction{ transactionType: String platformName: String } type Message{ fullText: String! description: String! } ` const resolvers = { Query : { search: () => { } }, SearchResults: { __resolveType: obj => { if(obj.logonID){ return "User" } if(obj.transactionType){ return "Transaction" } if(obj.fullText){ return "Message" } return null } } }

[@franciscobanda5213]

I understand that for each Union Type there needs to be a resolveType to distinguish which data type will come back however I'm unclear as to how initial Query Resolver connects to it.

[@bawad]

what do you mean by the initial query resolver? like your unsure what your search resolver should look like?

[@scottamolinari]

Am I the only one that isn't getting any sound?