error TS2740 Type 'DeepPartial<Quiz>[]' is missing the following properties from type 'Question': id, question, hasId, save, and 4 more

Question

I don't know how to fix this error. Does anyone know what I need to fix to get this code to work?

import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { CreateQuestionDto } from './dto/create-question.dto';
import { Question } from './question.entity';
import { QuestionRepository } from './question.repository';

@Injectable()
export class QuestionService {
  constructor(
    @InjectRepository(QuestionRepository)
    private questionRepository: QuestionRepository,
  ) {}

  async createQuestion(question: CreateQuestionDto): Promise<Question> {
    return await this.questionRepository.save(question);
  }
}

Returns the following error:

src/modules/quiz/question.service.ts:15:5 - error TS2740: Type 'DeepPartial[]' is missing the following properties from type 'Question': id, question, hasId, save, and 4 more.

15 return await this.questionRepository.save(question); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/modules/quiz/question.service.ts:15:47 - error TS2769: No overload matches this call. Overload 1 of 4, '(entities: DeepPartial[], options?: SaveOptions): Promise<(DeepPartial & Quiz)[]>', gave the following error. Argument of type 'CreateQuestionDto' is not assignable to parameter of type 'DeepPartial[]'. Type 'CreateQuestionDto' is missing the following properties from type 'DeepPartial[]': length, pop, push, concat, and 29 more. Overload 2 of 4, '(entity: DeepPartial, options?: SaveOptions): Promise<DeepPartial & Quiz>', gave the following error. Type 'CreateQuestionDto' has no properties in common with type 'DeepPartial'.

15 return await this.questionRepository.save(question);

Question entity:

import { BaseEntity, Column, Entity, PrimaryGeneratedColumn } from 'typeorm';

@Entity('questions')
export class Question extends BaseEntity {
  @PrimaryGeneratedColumn()
  id: string;

  @Column({
    type: 'varchar',
  })
  question: string;
}

Question repository:

import { EntityRepository, Repository } from 'typeorm';
import { Quiz } from './quiz.entity';

@EntityRepository(Quiz)
export class QuestionRepository extends Repository<Quiz> {}

CreateQuestion dto:

import { IsNotEmpty, Length } from 'class-validator';

export class CreateQuestionDto {
  @IsNotEmpty()
  @Length(3, 255)
  question: string;
}

Question repository:

import { EntityRepository, Repository } from 'typeorm';
import { Quiz } from './quiz.entity';

@EntityRepository(Quiz)
export class QuestionRepository extends Repository<Quiz> {}

Answer 1

The problem is that your QuestionRepository is pointing to another entity ( Quiz ).

Change it to:

export class QuestionRepository extends Repository<Question> {}

That way you can avoid the any clause and use the dto directly on the save call.

  async createQuestion(question: CreateQuestionDto): Promise<Question> {
    return await this.questionRepository.save(question);
  }