Using GraphQL Fragment on multiple types

Question

If I have a set of field that is common to multiple types in my GraphQL schema, is there a way to do something like this?

type Address {   line1: String   city: String   state: String    zip: String }  fragment NameAndAddress on Person, Business {   name: String   address: Address }  type Business {    ...NameAndAddress    hours: String }  type Customer {    ...NameAndAddress    customerSince: Date } 

Answer 1

Fragments are only used on the client-side when making requests -- they can't be used inside your schema. GraphQL does not support type inheritance or any other mechanism that would reduce the redundancy of having to write out the same fields for different types.

If you're using apollo-server, the type definitions that make up your schema are just a string, so you can implement the functionality you're looking for through template literals:

const nameAndAddress = `   name: String   address: Address `  const typeDefs = `   type Business {      ${nameAndAddress}      hours: String   }    type Customer {      ${nameAndAddress}      customerSince: Date   } ` 

Alternatively, there are libraries out there, like graphql-s2s, that allow you to use type inheritance.

Answer 2

Don't know if it was not available at this question time, but I guess interfaces should fit your needs