Installation

GraphQL-Utils also offers a NestJS 🔥 integration for all the utilities outlined in this documentation to make the code shorter and more intuitive in this framework.

The NestJS package can be installed with npm:

$ npm i @jenyus-org/nestjs-graphql-utils --save

Or yarn:

$ yarn add @jenyus-org/nestjs-graphql-utils

Usage

The most intuitive way to use the NestJS package is with the @Selections() decorator. It supports the same options as resolveSelections() and also a shorthand, where the first parameter is the parent field, and the second is an array of selections:

QueryLive

{ posts { id title body author { id username firstName lastName } } }

{
  posts {
    id
    title
    body
    author {
      id
      username
      firstName
      lastName
    }
  }
}

Code

import { Selections } from "@jenyus-org/nestjs-graphql-utils";

import { Parent, Query, ResolveField, Resolver } from "@nestjs/graphql";

import { UserObject } from "../users/dto/user.object";

import { UsersService } from "../users/users.service";

import { PostObject } from "./dto/post.object";

import { Post } from "./entities/post.entity";

import { PostsService } from "./posts.service";

@Resolver(() => PostObject)

class PostsResolver {

constructor(

private postsService: PostsService,

private usersService: UsersService

) {}

@Query(() => [PostObject])

posts(

@Selections("posts", ["**.**"])

relations: string[],

@Selections("posts", ["*."]) fields: string[]

) {

return await this.postsService.findAll({ relations, fields });

}

@ResolveField(() => UserObject)

async author(@Parent() post: Post) {

if (post.author) {

return post.author;

}

return await this.usersService.findOne({ postId: post.id });

}

}

Output

["author"]

["id","title","body"]