在雀巢上将ElasticSearch连接添加到app.module

Question

我正试图在我的app.module.ts上创建一个与app.module.ts的连接。我的项目文件夹看起来如下：

src
 |database
   |- elasticsearch-database.module.ts
   |- es.services.ts
 |services
   |- products
      |-products.controller.ts
      |-products.module.ts
      |-products.service.ts
 app.module.ts

首先，我在elasticsearch-database.module.ts上创建连接

 @Global()
    @Module({
        imports: [
            ElasticsearchModule.registerAsync({
                useFactory: () => ({
                  node: 'http://localhost:9200'
                })
              })
        ],
        providers: [SearchService],
        exports: [SearchService]
    })

export class elasticSearchDatabaseModule{}

我的SearchService在es.services.ts上

@Injectable()
export class SearchService {
  constructor(private readonly elasticsearchService: ElasticsearchService) {}
}

然后，我将elasticSearchDatabaseModule导入到

app.module.ts

@Module({
  imports: [
    elasticSearchDatabaseModule,
    ProductsModule
  ],
  
})
export class AppModule {}

我的ProductsModule on products.module.ts

@Module({
    imports: [
        elasticSearchDatabaseModule,

    ],
    controllers: [ProductsController],
    providers: [ ProductsService],
})

export class EventsModule { }

最后，在ProductsService上，我

import { ElasticsearchService } from "@nestjs/elasticsearch";
@Injectable()
export class EventsService {
    constructor(
        private readonly elasticSearch      : ElasticsearchService
    ) { }
}

所发生的错误是：

Potential solutions:
- If ElasticsearchService is a provider, is it part of the current EventsModule?
- If ElasticsearchService is exported from a separate @Module, is that module imported within EventsModule?
  @Module({
    imports: [ /* the Module containing ElasticsearchService */ ]
  })
 +3ms
Error: Nest can't resolve dependencies of the EventsService (?). Please make sure that the argument ElasticsearchService at index [0] is available in the EventsModule context.

如果我直接在products.module.ts上创建连接，我就能够完全编译，而不会出错。

imports: [
     
        ElasticsearchModule.register({
            node: 'http://elasticsearch:9200',
        })
    ]

但是，如果我想在其他服务中使用elasticSearch连接，我认为这不是最好的方法。

Answer 1

如果要公开由该动态模块(ElasticsearchModule.registerAsync() one)导出的所有提供程序，则需要导出ElasticsearchModule模块。请参阅：https://docs.nestjs.com/modules#module-re-exporting

为此，只需将ElasticsearchModule添加到elasticSearchDatabaseModule模块的exports数组中即可。