Class constructor UserDto cannot be invoked without 'new'

First of all, this lib is awesome!

I am facing the same problem of https://github.com/nestjsx/crud/issues/378 Class constructor UserDto cannot be invoked without 'new' TypeError: Class constructor UserDto cannot be invoked without 'new' I modified the boilerplate https://github.com/NarHakobyan/awesome-nest-boilerplate adding the crud controller and crud service.

The main differences between your example and the implementation are: I use an AbstractDto with a constructor that receives an AbstractEntity. Here is the AbstractDto:

import { AbstractEntity } from '../abstract.entity';

export class AbstractDto {
  id: string;
  createdAt: Date;
  updatedAt: Date;

  constructor(entity: AbstractEntity) {
    this.id = entity.id;
    this.createdAt = entity.createdAt;
    this.updatedAt = entity.updatedAt;
  }
}

AbstractEntity:

import {
  CreateDateColumn,
  PrimaryGeneratedColumn,
  UpdateDateColumn,
} from 'typeorm';

import { UtilsService } from '../providers/utils.service';
import { AbstractDto } from './dto/AbstractDto';

export abstract class AbstractEntity<T extends AbstractDto = AbstractDto> {
  @PrimaryGeneratedColumn('uuid')
  id: string;

  @CreateDateColumn({
    type: 'timestamp without time zone',
    name: 'created_at',
  })
  createdAt: Date;

  @UpdateDateColumn({
    type: 'timestamp without time zone',
    name: 'updated_at',
  })
  updatedAt: Date;

  abstract dtoClass: new (entity: AbstractEntity, options?: any) => T;

  toDto(options?: any) {
    return UtilsService.toDto(this.dtoClass, this, options);
  }
}

And on top of that I create my dtos and entities: UserDto

import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';

import { RoleType } from '../../../common/constants/role-type';
import { AbstractDto } from '../../../common/dto/AbstractDto';
import { ProfileDto } from '../../profile/profile.dto';
import { UserEntity } from '../user.entity';

export class UserDto extends AbstractDto {
  @ApiPropertyOptional()
  firstName: string;

  @ApiPropertyOptional()
  lastName: string;

  @ApiPropertyOptional({ enum: RoleType })
  role: RoleType;

  @ApiPropertyOptional()
  email: string;

  constructor(user: UserEntity) {
    super(user);
    this.firstName = user.firstName;
    this.lastName = user.lastName;
    this.role = user.role;
    this.email = user.email;
  }
}

UserEntity

import { Column, Entity, Index } from 'typeorm';

import { AbstractEntity } from '../../common/abstract.entity';
import { RoleType } from '../../common/constants/role-type';
import { UserDto } from './dto/user.dto';
import { PasswordTransformer } from './password.transformer';

@Entity({ name: 'users' })
export class UserEntity extends AbstractEntity<UserDto> {
  @Column({ nullable: true })
  firstName: string;

  @Column({ nullable: true })
  lastName: string;

  @Column({ type: 'enum', enum: RoleType, default: RoleType.USER })
  role: RoleType;

  @Index('email')
  @Column({ unique: true, nullable: true })
  email: string;

  @Column({ nullable: true, transformer: new PasswordTransformer() })
  password: string;

  dtoClass = UserDto;
}

I found some descriptions indicating that I need to change the tsconfig.json target to at least ES6, but it is already there.

My option is to not use a dtos with constructors, right? Will I need to create another dto just for this scenario like the other dto but without constructor? Or could you provide an example using dtos with constructors?

Thanks in advance

[valerybugakov]

adding @Exclude() to dtoClass helped me to resolve the issue:

  // src/common/abstract.entity.ts

  @Exclude()
  abstract dtoClass: new (entity: AbstractEntity, options?: any) => T

[Germano123]

I’m using the updated version of awesome boilerplate. It’s incredible 😄

I’m facing a similar issue :S using the abstract entities and abstract dtos. Even updating the target to ES6 didn’t help :S The problem is: using typeorm update in an entity causes it to break, even using @Exclude() property in dtoClass variable in AbstractEntity it still is assuming the need of the dtoClass variable.

The update code should be similar to this:

async update(dataId: string, data: DataEntity): Promise<DataEntity> {
  await dataRepository.update(dataId, data); // the problem lies here in data
  return await dataRepository.find(dataId);
}

I’ve tried to break the solution in typeorm save method which is not the best solution, but still got the same error :S

The code should look like this.

async updateWithSave(dataId: string, data: DataEntity): Promise<DataEntity> {
  let dataEntity = await this.repo.find(dataId);
  dataEntity = { ...dataEntity, ...data, id: dataId, toDto: any }; // the problem lies here in data
  return await this.repo.save(dataEntity);
}

The error is: “EntityColumnNotFound: No entity column “dtoClass” was found.”