GraphQLError：CreateUserInputDTO输入对象需定义至少一个字段求助

错误信息 #

GraphQLError: Input Object type CreateUserInputDTO must define one or more fields.
      at SchemaValidationContext.reportError

问题详情 #

已尝试过同类问题的解决方案但未解决，同类项目可正常运行，怀疑是使用了最新版本的相关模块导致错误。

相关代码 #

import {
  Field,
  InputType,
  IntersectionType,
  ObjectType,
  OmitType,
} from '@nestjs/graphql';
import { BaseDTO } from 'src/shared/dto/base.dto';

@ObjectType({ isAbstract: true })
@InputType({ isAbstract: true })
export class UserBaseDTO {
  @Field()
  public email: string;

  @Field()
  public firstName: string;

  @Field()
  public lastName: string;

  @Field({ nullable: true })
  public lastLoginTime: Date;

  @Field()
  public bio: string;

  @Field()
  public dob: Date;
}

@ObjectType()
export class UserDTO extends IntersectionType(
  UserBaseDTO,
  BaseDTO,
  ObjectType,
) {}

// 错误出在这里，手动添加属性后可正常运行
@InputType()
export class CreateUserInputDTO extends OmitType(UserBaseDTO, [
  'lastLoginTime',
]) {}

项目依赖（package.json） #

{"name": "server","version": "0.0.1","description": "","author": "","private": true,"license": "UNLICENSED","scripts": {"prebuild": "rimraf dist","build": "nest build","format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"","start": "nest start","start:dev": "nest start --watch","start:debug": "nest start --debug --watch","start:dev:db": "./scripts/start-db.sh","start:prod": "node dist/main","lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix","test": "jest","test:watch": "jest --watch","test:cov": "jest --coverage","test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand","test:e2e": "jest --config ./test/jest-e2e.json","typeorm": "ts-node -r tsconfig-paths/register ./node_modules/typeorm/cli -d src/config/ormconfigs.ts","migration:create": "cross-env ts-node -r tsconfig-paths/register ./node_modules/typeorm/cli migration:create ./src/migrations/$npm_config_name","migration:generate": "cross-env npm run typeorm -- migration:generate ./src/migrations/$npm_config_name","migration:run": "npm run build && npm run typeorm -- migration:run","migration:revert": "npm run typeorm -- migration:revert"},"dependencies": {"@apollo/gateway": "^2.1.1","@apollo/subgraph": "^2.1.1","@nestjs/apollo": "^10.1.0","@nestjs/common": "^9.0.11","@nestjs/config": "^2.2.0","@nestjs/core": "^9.0.11","@nestjs/graphql": "^10.1.1","@nestjs/platform-express": "^9.0.11","@nestjs/swagger": "^6.1.2","@nestjs/typeorm": "^9.0.1","apollo-server-express": "^3.10.2","axios": "^0.27.2","cross-env": "^7.0.3","dotenv": "^16.0.2","graphql": "^16.6.0","graphql-tools": "^8.3.6","mysql2": "^2.3.3","reflect-metadata": "^0.1.13","rimraf": "^3.0.2","rxjs": "^7.5.6","swagger-ui-express": "^4.5.0","ts-morph": "^16.0.0","typeorm": "^0.3.9"},"devDependencies": {"@nestjs/cli": "^9.1.3","@nestjs/schematics": "^9.0.3","@nestjs/testing": "^9.0.11","@types/express": "^4.17.14","@types/jest": "^29.0.2","@types/node": "^18.7.18","@types/supertest": "^2.0.12","@typescript-eslint/eslint-plugin": "^5.37.0","@typescript-eslint/parser": "^5.37.0","eslint": "^8.23.1","eslint-config-prettier": "^8.5.0","eslint-plugin-prettier": "^4.2.1","jest": "^29.0.3","prettier": "^2.7.1","supertest": "^6.2.4","ts-jest": "^29.0.1","ts-loader": "^9.3.1","ts-node": "^10.9.1","tsconfig-paths": "^4.1.0","typescript": "^4.8.3","yarn-upgrade-all": "^0.7.1"},"jest": {"moduleFileExtensions": ["js","json","ts"],"rootDir": "src","testRegex": ".*\\.spec\\.ts$","transform": {"^.+\\.(t|j)s$": "ts-jest"},"collectCoverageFrom": ["**/*.(t|j)s"],"coverageDirectory": "../coverage","testEnvironment": "node"}}

解决方案 #

问题根源在于@nestjs/graphql v10+版本中，使用OmitType处理同时标记为@ObjectType和@InputType的抽象类时，需要显式指定要继承的类型类型。

修改CreateUserInputDTO的定义，添加第三个参数指定为InputType：

@InputType()
export class CreateUserInputDTO extends OmitType(UserBaseDTO, ['lastLoginTime'], InputType) {}

原因解释 #

你的UserBaseDTO同时被装饰为@ObjectType和@InputType（均为抽象类），旧版本的NestJS GraphQL可能会默认推断要继承的类型，但新版本必须明确指定，否则OmitType会错误地处理成ObjectType的字段逻辑，导致生成的CreateUserInputDTO作为输入类型时没有可用字段，触发GraphQL的 schema 验证错误。

内容的提问来源于stack exchange，提问作者theboyonfire