NestJS TypeORM InjectRepository 无法读取未定义的属性“原型" [英] NestJS TypeORM InjectRepository Cannot read property 'prototype' of undefined

问题描述

尝试进行单元测试.出现以下错误:

Trying to unit test. Got following error:

TypeError: 无法读取未定义的属性 'prototype'

TypeError: Cannot read property 'prototype' of undefined

导出类 UserService {

export class UserService {

constructor(@InjectRepository(User) 私有只读 userRepository:存储库用户>) { }

constructor(@InjectRepository(User) private readonly userRepository: Repository < User>) { }

规范:

describe('AuthController', () => {
let authController: AuthController;
let authService: AuthService;
let mockRepository = {

};
beforeEach(async () => {
    const module = await Test.createTestingModule({
        imports: [
            TypeOrmModule.forFeature([User]),
        ],
        controllers: [AuthController],
        providers: [AuthService, {
            provide: getRepositoryToken(User),
            useValue: mockRepository
        }]
    }).compile()
    authService = module.get<AuthService>(AuthService);
    authController = module.get<AuthController>(AuthController)
});

有人可以分享一个解决方案吗?

Can someone share a solution please?

更多信息:

所以看起来 typeorm

beforeEach(async () => {
    const module = await Test.createTestingModule({

    }).compile()
    authService = module.get<AuthService>(AuthService);
    authController = module.get<AuthController>(AuthController)
});

使用此代码，我得到完全相同的错误.所以唯一的问题是将 typeorm 添加到这个测试模块中.

With this code I'm getting exact the same error. So only problem is adding typeorm to this test Module.

所以它因为依赖而失败:AuthController->AuthService->UserService->TypeORM

So it fails because of dependency: AuthController->AuthService->UserService->TypeORM

顺便说一句，刚刚使用 Postman API 检查了 UserService 并且它工作正常.

Btw just checked UserService using API with Postman and it works fine.

仍然没有结果:

 module = await Test.createTestingModule({
        controllers: [AuthController],
        components: [
            {
                provide: AuthService,
                useValue: {}
            },
            {
                provide: UserService,
                useValue: {}
            },
            {
                provide: getRepositoryToken(User),
                useValue: {}
            }
        ],
        providers: [
            {
                provide: AuthService,
                useValue: {}
            },
            {
                provide: UserService,
                useValue: {}
            },
            {
                provide: getRepositoryToken(User),
                useValue: {}
            }
        ]
    }).compile()
    this.authController = module.get<AuthController>(AuthController)

还有

class AuthServiceMock {
    logIn(userName) {
        return { id:100, isDeleted:false, login:"login", password:"password"};
    }

    signUp() {
        return { expireIn: 3600, token:"token" };
    }
}

describe('AuthController', () => {
let module: TestingModule;
let authController: AuthController;
let authService: AuthService;

beforeEach(async () => {
    module = await Test.createTestingModule({
        controllers: [AuthController],
        components: [

        ],
        providers: [
            {
                provide: AuthService,
                useClass: AuthServiceMock
            },
        ]
    }).compile()
    this.authController = module.get<AuthController>(AuthController)
});

推荐答案

我查看了您在 Kim Kern 下的评论中提供的项目 (https://github.com/rankery/wof-server)

I looked at the project you provided in a comment under Kim Kern (https://github.com/rankery/wof-server)

您正在使用桶文件 (src/user/index.ts)，导出 UserModule

You are using a barrel file (src/user/index.ts), exporting the UserModule

export * from './user.module';

我猜你稍后会使用这个桶文件来导入模块.

I guess you are using this barrel file to import the module later on.

现在，每次导入barrel 文件的内容时，都会执行src/user/user.module.ts 构建版本中包含的代码，其中包括对UserModule 类，这反过来会使 Typeorm 尝试构建一个 Repository，从而导致错误.

Now, every time the content of the barrel file is imported , the code contained in the built version of your src/user/user.module.ts is executed, which include the decoration of the UserModule class, which in turns will make Typeorm try to build a Repository, which causes the error.

您应该从 src/user/index.ts 中删除此导出(或简单地删除该文件)并修复由此删除导致的损坏的导入，它应该可以工作.

You should remove this export from src/user/index.ts (or simply delete the file) and fix the broken imports caused by this removal and it should work.

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