我有一个服务,在它的构造函数中使用@InjectConnection
装饰器。
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才能被GridFS调用,但是现在我无法实际构建测试模块。
当您不添加显式连接名称时,nest.js将为use the default connection token DatabaseConnection
,它由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: {},
}]
拉取请求已合并。你现在可以getConnectionToken()
。
我创建了一个pull request,它允许没有任何参数的getConnectionToken()
返回默认的连接标记。