NestJS

Question

我有一个在其构造函数中使用 @InjectConnection 装饰器的服务。

我无法为此服务实例化 testingModule。抛出以下错误：Nest can't resolve dependencies of the AttachmentsService (?, winston). Please make sure that the argument at index [0] is available in the TestModule context.

服务构造函数：

  constructor(@InjectConnection() private readonly mongooseConnection: Mongoose,
              @Inject(Modules.Logger) private readonly logger: Logger) {
    this.attachmentGridFsRepository = gridfs({
      collection: 'attachments',
      model: Schemas.Attachment,
      mongooseConnection: this.mongooseConnection,
    });

    this.attachmentRepository = this.attachmentGridFsRepository.model;
  }

测试模块构造函数：

const module: TestingModule = await Test.createTestingModule({
  imports: [
    WinstonModule.forRoot({
      transports: [
        new transports.Console({
          level: 'info',
          handleExceptions: false,
          format: format.combine(format.json()),
        }),
      ],
    }),
  ],
  providers: [AttachmentsService, {
    provide: getConnectionToken(''),
    useValue: {},
  }],
}).compile();

service = module.get<AttachmentsService>(AttachmentsService);

我意识到我必须模拟连接对象以供 GridFS 调用，但现在我无法真正构建测试模块。

Answer 1

当不添加显式连接名时，nest.js会use the default connection tokenDatabaseConnection，nestjs-mongoose包定义为常量：

export const DEFAULT_DB_CONNECTION = 'DatabaseConnection';

所以你可以使用getConnectionToken('Database'):

providers: [AttachmentsService, {
  provide: getConnectionToken('Database'),
  useValue: {},
}]

2019 年更新

拉取请求已合并。您现在可以 getConnectionToken().

我创建了一个 pull request，它让 getConnectionToken() 没有任何参数 return 默认连接令牌。

NestJS - Mongoose @InjectConnection 单元测试

NestJS - Mongoose @InjectConnection unit testing

mongoose

node.js

gridfs

typescript

2019 年更新