Nest无法解析导入JwtService的服务的依赖项 [英] Nest can't resolve dependencies of the service which imports JwtService

问题描述

我正在尝试使用 @ nestjs/jwt .特别是它的registerAsync方法(我的配置服务异步加载配置).我正在AuthModule中注册JwtModule，然后为每个登录/注册提供程序加载特定的模块.然后，将JwtService添加到EmailService的提供程序中，但是失败.

I am trying to use @nestjs/jwt. Particularly its registerAsync method (my config service loads the configuration asynchronously). I am registering JwtModule in the AuthModule, which then loads specific modules for each login/registration providers. Then I add JwtService to the providers of EmailService but it fails.

应用程序的结构如下(非常示意):

The structure of the application is as follows (very schematic):

app.module.ts

@Module({
  imports: [
    AuthModule,
    ...
  ]
})
export class ApplicationModule {}

auth.module.ts

@Module({
  imports: [
    PassportModule.register({ defaultStrategy: 'jwt' }),
    JwtModule.registerAsync({
      useFactory: async (config: ConfigService) => ({
        secretOrPrivateKey: config.get('jwt.secret')
      }),
      inject: [ConfigService]
    }),
    EmailAuthModule
  ],
  exports: [JwtModule]
})
export class AuthModule {}

email.module.ts

@Module({
  imports: [...],
  controllers: [...],
  providers: [EmailService, ...]
})
export class EmailAuthModule {}

email.service.ts

@Injectable()
export class EmailService {
  constructor(
    private readonly jwtService: JwtService
  ) {}
}

应用程序启动时失败，并显示以下错误:

Application fails with this error upon startup:

Nest can't resolve dependencies of the EmailService (UsersService, ?). Please make sure that the argument at index [1] is available in the current context. +70ms
Error: Nest can't resolve dependencies of the EmailService (UsersService, ?). Please make sure that the argument at index [1] is available in the current context.
    at Injector.lookupComponentInExports (/Users/.../api/node_modules/@nestjs/core/injector/injector.js:146:19)
    at process._tickCallback (internal/process/next_tick.js:68:7)
    at Function.Module.runMain (internal/modules/cjs/loader.js:745:11)
    at Object.<anonymous> (/Users/.../api/node_modules/ts-node/src/_bin.ts:177:12)
    at Module._compile (internal/modules/cjs/loader.js:689:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
    at Module.load (internal/modules/cjs/loader.js:599:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
    at Function.Module._load (internal/modules/cjs/loader.js:530:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:742:12)

我想念什么?

推荐答案

服务不是全局的，只能在自身提供的模块中使用或从导出服务的另一个模块中导入.

Services are not global but can only be used in the modules that provide them themselves or import them from another module that exports the service.

这里的问题是EmailService依赖于JwtService，但是EmailAuthModule既不提供JwtService本身，也没有导入导出JwtService的模块. (不幸的是，您在这里省略了EmailAuthModule的imports.)

The problem here is that the EmailService depends on the JwtService but the EmailAuthModule does neither provide the JwtService itself nor import a module that exports the JwtService. (Unfortunately, you left out the EmailAuthModule's imports here.)

因此，要解决此问题，您必须导入JwtModule本身或另一个将JwtModule导出到EmailAuthModule中的模块.

So to solve this you have to import either the JwtModule itself or another module that exports the JwtModule in the EmailAuthModule.

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