GraphQL output type - graphql

Question

Trying to build NestJS + GraphQL + TypeORM backend and I am stuck on trying to create mutations and queries. Tutorials people solve the problem in exactly this way, but still I can't understand what the error is.
Error: Cannot determine a GraphQL output type for the "createUser". Make sure your class is decorated with an appropriate decorator.
All decorators seem to be okay. Anyone have same problem?
user.module.ts
import { Module } from '#nestjs/common';
import { UserService } from './user.service';
import { UsersResolver } from './user.resolver';
import { TypeOrmModule } from '#nestjs/typeorm';
import { User } from './user.entity';
#Module({
imports: [TypeOrmModule.forFeature([User])],
exports:[TypeOrmModule],
providers: [UserService,UsersResolver ],
})
export class UserModule {}
user.entity.ts
import {
Column,
Entity,
OneToMany,
PrimaryGeneratedColumn,
} from 'typeorm';
import { Post } from '../post/post.entity';
import { Comment } from '../comment/comment.entity';
import { Field, ObjectType } from '#nestjs/graphql';
enum RoleEnum {
Admin = 'Admin',
Author = 'Author',
}
#Entity()
#ObjectType()
export class User {
#PrimaryGeneratedColumn('uuid')
#Field()
id: string;
#Column()
#Field()
name: string;
#Column()
#Field()
email: string;
#Column()
#Field()
password: string;
#Column({
type: 'enum',
enum: RoleEnum,
default: RoleEnum.Author,
})
#Field()
role: RoleEnum;
#OneToMany((type) => Post, post => post.user)
#Field(type=>Post)
posts: Post[];
#OneToMany((type) => Comment, comment => comment.author)
#Field(type=>Comment)
comments: Comment[];
}
user.resolver.ts
import { Args, Mutation, Query, Resolver } from '#nestjs/graphql';
import { UserService } from './user.service';
import { CreateUserDto } from './dto/createuser.dto';
import { userInput } from './input/user.input';
import { User } from './user.entity';
#Resolver((of=>User))
export class UsersResolver {
constructor(private userService: UserService) {
}
#Mutation(()=> [CreateUserDto])
async createUser (#Args('data') data: userInput){
return this.userService.createUser(data)
}
}
user.service.ts
import { Injectable } from '#nestjs/common';
import { InjectRepository } from '#nestjs/typeorm';
import { User } from './user.entity';
import { Repository } from 'typeorm';
import { CreateUserDto } from './dto/createuser.dto';
#Injectable()
export class UserService {
constructor (#InjectRepository(User) private readonly userRepository: Repository<User>) {}
async createUser (data: CreateUserDto): Promise<User> {
const user = new User()
user.name=data.name
user.email=data.email
user.role=data.role
user.password=data.password
await this.userRepository.save(user)
return user
}
}
createUser.dto.ts
import { Field, ObjectType } from 'type-graphql';
import { registerEnumType } from '#nestjs/graphql';
enum RoleEnum {
Admin = 'Admin',
Author = 'Author',
}
registerEnumType(RoleEnum, {
name: 'RoleEnum',
});
#ObjectType()
export class CreateUserDto {
#Field() name: string;
#Field() email: string;
#Field() password: string;
#Field(type => RoleEnum) role: RoleEnum;
}
user.input.ts
import { Field, InputType } from 'type-graphql';
import { registerEnumType } from '#nestjs/graphql';
enum RoleEnum {
Admin = 'Admin',
Author = 'Author',
}
registerEnumType(RoleEnum, {
name: 'RoleEnum',
});
#InputType()
export class userInput {
#Field() name: string;
#Field() email: string;
#Field() password: string;
#Field(type => RoleEnum) role: RoleEnum;
}

Answer 1

I noticed few possible causes for the error,
1. user.resolver.ts
#Mutation() decorator should return the type [User], not the type [CreateUserInput]
#Mutation(()=> [User]) // change here
async createUser (#Args('data') data: userInput){
return this.userService.createUser(data)
}
2. user.input.ts
If you encounter error : "Input" cannot be found in the registry,
add #ArgsType() decorator to the class userInput
#InputType()
#ArgsType() //add decorator here
export class userInput {
#Field() name: string;
#Field() email: string;
#Field() password: string;
#Field(type => RoleEnum) role: RoleEnum;
}
note: I used "#nestjs/graphql": "^7.10.3",