我正在嘗試在我的 app.module.ts 上創建與ElasticSearch的連接。我的專案檔案夾如下所示：
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，我正在創建連接elasticsearch-database.module.ts
@Global()
@Module({
imports: [
ElasticsearchModule.registerAsync({
useFactory: () => ({
node: 'http://localhost:9200'
})
})
],
providers: [SearchService],
exports: [SearchService]
})
export class elasticSearchDatabaseModule{}
我的SearchService已開啟es.services.ts
@Injectable()
export class SearchService {
constructor(private readonly elasticsearchService: ElasticsearchService) {}
}
然后，我正在匯入elasticSearchDatabaseModule
app.module.ts
@Module({
imports: [
elasticSearchDatabaseModule,
ProductsModule
],
})
export class AppModule {}
我的產品模塊products.module.ts
@Module({
imports: [
elasticSearchDatabaseModule,
],
controllers: [ProductsController],
providers: [ ProductsService],
})
export class EventsModule { }
最后，在ProductsService上，我有
import { ElasticsearchService } from "@nestjs/elasticsearch";
@Injectable()
export class EventsService {
constructor(
private readonly elasticSearch : ElasticsearchService
) { }
}
發生的錯誤是：
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.
如果我直接在以下位置創建連接，我能夠完全編譯而不會出錯products.module.ts：
imports: [
ElasticsearchModule.register({
node: 'http://elasticsearch:9200',
})
]
但是如果我想在其他服務中使用那個 elasticSearch 連接，我認為這不是最好的方法。
uj5u.com熱心網友回復：
如果要公開該動態模塊（ElasticsearchModule.registerAsync()一個）匯出的所有提供程式，則需要匯出ElasticsearchModule模塊。請參閱：https ://docs.nestjs.com/modules#module-re-exporting
為此，只需添加ElasticsearchModule到模塊exports陣列中。elasticSearchDatabaseModule
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