Use interfaces to build graphql query

Question

is it possible to build graphql queries using existing interfaces? or we should write same code twice)

interface Post {
  id: string;
  title: string;
  ...

and then writing same fields in query

query allPosts {
      posts {
        id
        title
        ...

is there any way to write something like

query allPosts {
      posts: Post[]

score 2 · Accepted Answer · answered Feb 24 '20 at 12:51

It's not possible to do something like that because TypeScript types don't exist at runtime. Interfaces are also insufficient to represent GraphQL fields because they can't capture information like argument values or directive usage.

You can, however, auto-generate TypeScript types from existing queries, which is what is normally done. See GraphQL Code Generator.

score 1 · Answer 2 · answered Feb 24 '20 at 12:55

1

NO ... types!=queries ... posts: Post[] already used in response definition

Query defines what subset (fields) you need from this (and other) type(-s), f.e. only title

You're probably looking for Fragments

answered Feb 24 '20 at 12:55

xadm

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and why i cant make query from type? fields are the same Fragments are not what i am looking for – Pasha K Feb 24 '20 at 14:03
get answer in second comment) – Pasha K Feb 24 '20 at 14:06

Use interfaces to build graphql query

2 Answers2