Schema iku kontrak sing diketik saka sawijining GraphQL API, ditulis nganggo SDL (Schema Definition Language). Iki ndeklarasi saben type, saben field, lan root type khusus — Query (maca), Mutation (nulis), lan opsional Subscription (langsung). Server bakal nolak request apa wae sing ora cocog karo schema.
Int, Float, String, Boolean, lan ID. Kowe uga bisa nggawe scalar khusus kaya DateTime.scalar DateTime # a custom scalar
type User { # an object type
id: ID! # ! means non-null (always present)
name: String!
createdAt: DateTime!
posts: [Post!]! # a list of Post objects, non-null list of non-null items
}
type Post {
id: ID!
title: String!
author: User! # points back to User -> a relationship
}
type Query { # root type: the entry points for reads
user(id: ID!): User # a field with an argument; returns a User (nullable)
}
Tandha ! nuduhake non-null; [Post!]! iku list non-null sing isine uga non-null. Argumen (id: ID!) ngidini sawijining field diparameterisasi.
Schema iku siji-sijine sumber kebeneran — iki nyetir validasi, dokumentasi sing digawe otomatis, lan codegen klien. Maca ! lan tipe list kanthi bener iku pemeriksaan screening junior sing umum, lan keputusan babagan nullability nemtokake carane klien nangani error.
Pustaka pitakon wawancara IT kanthi jawaban rinci — saka Junior nganti Senior.
Nyumbang