It was made based on Deno docs:
deno run --allow-run --allow-net --allow-read --allow-env main.ts
You can use the standard
owners { ... }
You can query by ID
owners(id: "3") { ... }
You also can find by their name part
owners(id: "Doe") { ... }
Last active
January 10, 2024 20:33
-
-
Save ninetails/cdea2a9d779d00c226f4c3aca8e709e4 to your computer and use it in GitHub Desktop.
GraphQL: interfaces & resolvers
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| query ExampleQuery { | |
| owners { | |
| id | |
| name | |
| pets { | |
| __typename | |
| id | |
| name | |
| ... on Dog { | |
| isGoodBoy | |
| } | |
| ... on Cat { | |
| lives | |
| } | |
| ... on Bird { | |
| canFly | |
| } | |
| } | |
| } | |
| } |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import { ApolloServer } from "npm:@apollo/server@^4.10.0"; | |
| import { startStandaloneServer } from "npm:@apollo/[email protected]/standalone"; | |
| import { graphql } from "npm:[email protected]"; | |
| import { typeDefs } from "./schema.ts"; | |
| import { resolvers } from "./resolvers.ts"; | |
| const server = new ApolloServer({ | |
| typeDefs, | |
| resolvers, | |
| }); | |
| const { url } = await startStandaloneServer(server, { | |
| listen: { port: 8000 }, | |
| }); | |
| console.log(`Server running on: ${url}`); |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| interface Owner { | |
| id: string; | |
| name: string; | |
| } | |
| interface Pet { | |
| id: string; | |
| type?: PetType; | |
| name: string; | |
| ownerId: string; | |
| [key: string]: any; | |
| } | |
| interface Dog extends Pet { | |
| isGoodBoy: boolean; | |
| } | |
| interface Cat extends Pet { | |
| lives: number; | |
| } | |
| interface Bird extends Pet { | |
| canFly: boolean; | |
| } | |
| interface UnknownPet extends Pet { | |
| } | |
| type Pets = Dog | Cat | Bird | UnknownPet; | |
| enum PetType { | |
| DOG = 'DOG', | |
| CAT = 'CAT', | |
| BIRD = 'BIRD', | |
| } | |
| const owners: Owner[] = [ | |
| { | |
| id: "1", | |
| name: "John Doe", | |
| }, | |
| { | |
| id: "2", | |
| name: "Jane Doe", | |
| }, | |
| { | |
| id: "3", | |
| name: "John Smith", | |
| }, | |
| { | |
| id: "4", | |
| name: "Jane Smith", | |
| }, | |
| ] | |
| const pets: Pets[] = [ | |
| { | |
| id: "1", | |
| type: PetType.DOG, | |
| name: "Doggo", | |
| ownerId: "1", | |
| isGoodBoy: true, | |
| }, | |
| { | |
| id: "2", | |
| type: PetType.CAT, | |
| name: "Catto", | |
| ownerId: "2", | |
| lives: 9, | |
| }, | |
| { | |
| id: "3", | |
| type: PetType.BIRD, | |
| name: "Birdo", | |
| ownerId: "3", | |
| canFly: false, | |
| }, | |
| { | |
| id: "4", | |
| type: PetType.BIRD, | |
| name: "Penguin", | |
| ownerId: "3", | |
| canFly: false, | |
| }, | |
| { | |
| id: "5", | |
| name: "Isneik", | |
| ownerId: "2", | |
| } | |
| ] | |
| export const resolvers = { | |
| Owner: { | |
| pets: (owner: Owner) => { | |
| return pets.filter((pet) => pet.ownerId === owner.id) | |
| }, | |
| }, | |
| Pet: { | |
| __resolveType(pet: Pet, contextValue: any, info: any){ | |
| switch (pet.type) { | |
| case PetType.DOG: | |
| return 'Dog'; | |
| case PetType.CAT: | |
| return 'Cat'; | |
| case PetType.BIRD: | |
| return 'Bird'; | |
| default: | |
| return 'UnknownPet'; | |
| } | |
| }, | |
| }, | |
| Query: { | |
| owners: (_: any, { id, name }: { id: string, name: string }) => { | |
| if (id) { | |
| return owners.filter((owner) => owner.id === id); | |
| } | |
| if (name) { | |
| return owners.filter((owner) => owner.name.toLocaleLowerCase().includes(name.toLocaleLowerCase())); | |
| } | |
| return owners; | |
| }, | |
| owner: (_: any, { id, name }: { id: string, name: string }) => { | |
| if (id) { | |
| const owner = owners.find((owner) => owner.id === id); | |
| if (!owner) { | |
| throw new Error(`No owner with id: ${id}`); | |
| } | |
| return owner; | |
| } | |
| if (name) { | |
| const owner = owners.find((owner) => owner.name.toLocaleLowerCase().includes(name.toLocaleLowerCase())); | |
| if (!owner) { | |
| throw new Error(`No owner with name or part: ${name}`); | |
| } | |
| return owner; | |
| } | |
| throw new Error('You must provide either an id or a name'); | |
| }, | |
| pets: () => pets, | |
| }, | |
| }; |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| export const typeDefs = ` | |
| type Owner { | |
| id: ID! | |
| name: String! | |
| pets: [Pet] | |
| } | |
| interface Pet { | |
| id: ID! | |
| name: String! | |
| owner: Owner! | |
| } | |
| type Dog implements Pet { | |
| id: ID! | |
| name: String! | |
| owner: Owner! | |
| isGoodBoy: Boolean | |
| } | |
| type Cat implements Pet { | |
| id: ID! | |
| name: String! | |
| owner: Owner! | |
| lives: Int | |
| } | |
| type Bird implements Pet { | |
| id: ID! | |
| name: String! | |
| owner: Owner! | |
| canFly: Boolean | |
| } | |
| type UnknownPet implements Pet { | |
| id: ID! | |
| name: String! | |
| owner: Owner! | |
| } | |
| type Query { | |
| owners(id: String, name: String): [Owner] | |
| owner(id: String, name: String): Owner! | |
| pets: [Pet] | |
| } | |
| `; |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment