Implement FieldResolver in TypeGraphQL for an array of objects

My current dilemma revolves around a specific issue related to the definition of my Cart type, which is structured as follows:

@ObjectType()
export class Cart {
    @Field(() => ID)
    id: string;

    @Field((_type) => String)
    ownerId: String

    @Field((_type) => User)
    owner: User;
}

To resolve the owner of each cart effectively, I have implemented a type resolver:

@FieldResolver((_type) => User)
async owner(@Root() cart: Cart): Promise<User> {
    return (await UserModel.findById(cart.ownerId))!
}

However, I have encountered inefficiencies when querying multiple carts due to the FieldResolver being called individually for each cart. As a solution, I am looking for a way to optimize this process by fetching all cart IDs and retrieving the corresponding owners in a single query.

If there are any insights or solutions on how to achieve this more efficiently, your input would be greatly appreciated. Thank you.

Answer №1

To solve the issue, I utilized the graphql dataloader package: https://github.com/graphql/dataloader

A dataloader must be defined within the application context, similar to the following:

{
  context: async ({req, res}) => {
    return {
      userDataLoader: new DataLoader(async (ids) => {
        return UserModel.find({
            _id: {
                $in: ids
            }
        })
      })
    }
  }
}

Within the resolver:

@FieldResolver((_type) => User)
async owner(@Root() cart: CartProjection, @Ctx() context: Context,) {
   return context.userDataLoader.load(cart.ownerId)
}

The users are efficiently loaded in one magical swoop.

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Dealing with problems related to types in React and TypeScript createContext

Struggling to pass the todos (initial state) and addNewTodo (methods) using React Context hook and typescript. Despite trying multiple solutions, errors persist. Partial generics do not cause issues in the context component, but I encounter the error Cann ...

Expanding the base class and incorporating a new interface

(Here is an example written using Typescript, but it applies to other cases as well) class IMyInterface { doC:(any) => any; } class Common { commonProperty:any; doA() { } doB() { } } class ClassA extends Common {} class Clas ...

Obtain varied results from the Knockout module

In my application, I am utilizing Knockout and Typescript. One of the classes in my code is as follows: class Address { State :string; ZIP: string; Street: string; } I want to create a component that will handle the updating of an object of ...

Store Angular 17 control flow in a variable for easy access and manipulation

Many of us are familiar with the trick of "storing the conditional variable in a variable" using *ngIf="assertType(item) as renamedItem" to assign a type to a variable. This technique has always been quite useful for me, as shown in this example: <ng-t ...

The duration of recorded audio in JavaScript is unclear

I managed to successfully create a structure for recording and downloading audio files. However, I'm facing an issue where the final downloaded file has an unknown duration. Is there any way to solve this problem?? Here is my Typescript code snippet: ...

Using object in Typescript for function overloading - External visibility of implementation signatures for overloads is restricted

Issue How do I correctly expose an overloaded implementation signature? Scenario Expanding on the initial query: interface MyMap<T> { [id: string]: T; } type Options = { asObject?: boolean, other?: Function testing?: number }; function g ...

Attempting to retrieve a file from the database with the utilization of Angular 5 and ASP.NET Core

I've been struggling with downloading a file from the database using its unique identifier. Can anyone provide guidance on what steps are necessary to achieve this successfully? The FileUpload table contains the following columns pertaining to the fi ...

Unable to link to 'amount' because it is not a recognized attribute of 'ng-wrapper'

I recently made some changes to my code and now I'm encountering the error message "Can't bind to 'count' since it isn't a known property of 'ng-container'" Instead of having both the notification component and notificat ...

JS/Docker - The attribute 'user' is not recognized in the context of 'Session & Partial<SessionData>'

I'm attempting to integrate express-session into my Node.js application running within Docker. I've come across several discussions on the topic: Express Session: Property 'signin' does not exist on type 'Session & Partial<Se ...

Having issues with an Angular reactive form that includes a custom form-level validator and the 'blur' updateOn option?

Having issues combining the following: angular reactive form custom validator at form level (cross-field validator) usage of the 'updateOn' option set to 'blur' A demonstration of the problem can be found in this simple stackblitz: h ...

The potential for an 'undefined' object in TypeScript React is a concern that should be addressed

Currently, I am honing my skills in using TypeScript with React and retrieving data from an API that I set up a few days back. The API is functioning properly as I am able to fetch data for my front-end without any issues. However, when I attempt to util ...

What is the process for an Angular Component to receive a return object from a service following an HTTP

I am currently working with angular 4. Is there a way to retrieve an object from a service in this framework? export class LoginRequest { username : string; password : string; } export class LoginResponse { token : string; message : string; sta ...

Assigning variables within Redux saga generators/sagas

Consider this scenario: function* mySaga(){ const x = yield call(getX) } The value of const x is not determined directly by the return value of call(getX()). Instead, it depends on what is passed in mySaga.next(whatever) when it is invoked. One might a ...

The term 'Component' is not a valid JSX component that can be used

'Component' is causing issues as a JSX component The error appears to be within the _app.tsx file of my Next.js project. I've been struggling with this problem since yesterday, encountered it during deployment on Vercel for my Next.js TypeS ...

Apollo Client's implementation of a GraphQL query is resulting in a response that contains no data

After incorporating websockets and subscriptions into my React application, I am encountering issues with receiving empty arrays in the responses. Below is an excerpt from my server.js file: import * as dotenv from 'dotenv' dotenv.config() impor ...

Adjusting an item according to a specified pathway

I am currently working on dynamically modifying an object based on a given path, but I am encountering some difficulties in the process. I have managed to create a method that retrieves values at a specified path, and now I need to update values at that pa ...

Using the Google Identity Services JavaScript SDK in conjunction with Vue and TypeScript: A comprehensive guide

I am currently working on authorizing Google APIs using the new Google Identity Services JavaScript SDK in my Vue / Quasar / TypeScript application. Following the guidelines provided here, I have included the Google 3P Authorization JavaScript Library in ...

Issue encountered during frida-il2cpp-bridge module installation

Having trouble with installing the frida module (frida-il2cpp-bridge)? I followed the steps, but encountered errors. You can check out the installation steps here. The specific error message I received is: Spawned `com.games`. Resuming main thread! Refe ...

Initiating a GET request to execute an SQL query with specified parameters

Let me provide some background information. I am currently using Angular for the frontend and Express for the backend, while also learning how to effectively utilize both technologies. In my application, there is a parent component that generates a group ...

Tips for preventing the occurrence of a final empty line in Deno's TextLineStream

I executed this snippet of code: import { TextLineStream } from "https://deno.land/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="7201061632425c4341445c42">[email protected]</a>/streams/mod.ts"; const cm ...