# GraphQL
GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. GraphQL provides a complete and understandable description of the data in your API, gives clients the power to ask for exactly what they need and nothing more, makes it easier to evolve APIs over time, and enables powerful developer tools.
# Feature
- Create Apollo (opens new window) Server and bind it with Ts.ED,
- Create multiple servers,
- Support TypeGraphQL (opens new window), Nexus (opens new window) or standalone Apollo server.
# Apollo
# Installation
import {Configuration} from "@tsed/common";
import "@tsed/platform-express";
import "@tsed/apollo";
import {join} from "path";
@Configuration({
apollo: {
server1: {
// GraphQL server configuration
path: "/",
playground: true, // enable playground GraphQL IDE. Set false to use Apollo Studio
plugins: [] // Apollo plugins
// Give custom server instance
// server?: (config: Config) => ApolloServer;
// ApolloServer options
// ...
// See options descriptions on https://www.apollographql.com/docs/apollo-server/api/apollo-server.html
}
}
})
export class Server {}
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# Nexus
# Installation
Now, we can configure the Ts.ED server by importing @tsed/apollo
in your Server:
import {Configuration} from "@tsed/common";
import "@tsed/platform-express";
import "@tsed/apollo";
import {schema} from "./schema";
import {join} from "path";
@Configuration({
apollo: {
server1: {
// GraphQL server configuration
path: "/",
playground: true, // enable playground GraphQL IDE. Set false to use Apollo Studio
schema,
plugins: [] // Apollo plugins
// Give custom server instance
// server?: (config: Config) => ApolloServer;
// ApolloServer options
// ...
// See options descriptions on https://www.apollographql.com/docs/apollo-server/api/apollo-server.html
}
}
})
export class Server {}
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Then create schema/index.ts
:
import {makeSchema} from "nexus";
import {join} from "path";
export const schema = makeSchema({
types: [], // 1
outputs: {
typegen: join(process.cwd(), "..", "..", "nexus-typegen.ts"), // 2
schema: join(process.cwd(), "..", "..", "schema.graphql") // 3
}
});
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# TypeGraphQL
# Installation
To begin, install the @tsed/typegraphql
package:
Now, we can configure the Ts.ED server by importing @tsed/typegraphql
in your Server:
# Types
We want to get the equivalent of this type described in SDL:
type Recipe {
id: ID!
title: String!
description: String
creationDate: Date!
ingredients: [String!]!
}
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So we create the Recipe class with all properties and types:
class Recipe {
id: string;
title: string;
description?: string;
creationDate: Date;
ingredients: string[];
}
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Then we decorate the class and its properties with decorators:
import {Field, ID, ObjectType} from "type-graphql";
@ObjectType()
export class Recipe {
@Field((type) => ID)
id: string;
@Field()
title: string;
@Field({nullable: true})
description?: string;
@Field()
creationDate: Date;
@Field((type) => [String])
ingredients: string[];
}
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The detailed rules for when to use nullable, array and others are described in fields and types docs (opens new window).
# Resolvers
After that we want to create typical crud queries and mutation. To do that we create the resolver (controller) class that will have injected RecipeService in the constructor:
import {Inject} from "@tsed/di";
import {ResolverService} from "@tsed/typegraphql";
import {Arg, Args, Query} from "type-graphql";
import {RecipeNotFoundError} from "../errors/RecipeNotFoundError";
import {RecipesService} from "../services/RecipesService";
import {Recipe} from "../types/Recipe";
import {RecipesArgs} from "../types/RecipesArgs";
@ResolverService(Recipe)
export class RecipeResolver {
@Inject()
private recipesService: RecipesService;
@Query((returns) => Recipe)
async recipe(@Arg("id") id: string) {
const recipe = await this.recipesService.findById(id);
if (recipe === undefined) {
throw new RecipeNotFoundError(id);
}
return recipe;
}
@Query((returns) => [Recipe])
recipes(@Args() {skip, take}: RecipesArgs) {
return this.recipesService.findAll({skip, take});
}
}
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# Data Source
Data source is one of the Apollo server features which can be used as option for your Resolver or Query. Ts.ED provides a DataSourceService decorator to declare a DataSource which will be injected to the Apollo server context.
import {DataSourceService} from "@tsed/typegraphql";
import {RESTDataSource} from "apollo-datasource-rest";
import {User} from "../models/User";
@DataSourceService()
export class UserDataSource extends RESTDataSource {
constructor() {
super();
this.baseURL = "https://myapi.com/api/users";
}
getUserById(id: string): Promise<User> {
return this.get(`/${id}`);
}
}
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Then you can retrieve your data source through the context in your resolver like that:
import {ResolverService} from "@tsed/typegraphql";
import {Arg, Authorized, Ctx, Query} from "type-graphql";
import {UserDataSource} from "../datasources/UserDataSource";
import {User} from "../models/User";
@ResolverService(User)
export class UserResolver {
@Authorized()
@Query(() => User)
public async user(@Arg("userId") userId: string, @Ctx("dataSources") dataSources: any): Promise<User> {
const userDataSource: UserDataSource = dataSources.userDataSource;
return userDataSource.getUserById(userId);
}
}
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# Get Server instance
ApolloService (or TypeGraphQLService) lets you to retrieve an instance of ApolloServer.
import {AfterRoutesInit} from "@tsed/common";
import {Inject, Injectable} from "@tsed/di";
import {ApolloService} from "@tsed/apollo";
import {ApolloServer} from "apollo-server-express";
@Injectable()
export class UsersService implements AfterRoutesInit {
@Inject()
private ApolloService: ApolloService;
// or private typeGraphQLService: TypeGraphQLService;
private server: ApolloServer;
$afterRoutesInit() {
this.server = this.apolloService.get("server1")!;
}
}
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For more information about ApolloServer, look at its documentation here (opens new window);
# Testing
Here is an example to create a test server based on TypeGraphQL and run a query:
The unit example is also available to test any Apollo Server!
# Author
# Maintainers
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