从另一个模块注入nestjs服务 [英] Inject nestjs service from another module

问题描述

我有一个 PlayersModule 和一个 ItemsModule 。

我想在 PlayersService 中使用 ItemsService 。

当我通过注射添加它时：

When I add it by injection:

import { Injectable } from '@nestjs/common';
import { InjectModel } from 'nestjs-typegoose';
import { ModelType, Ref } from 'typegoose';
import { Player } from './player.model';
import { Item } from '../items/item.model';
import { ItemsService } from '../items/items.service';

@Injectable()
export class PlayersService {
    constructor(
        @InjectModel(Player) private readonly playerModel: ModelType<Player>,
        private readonly itemsService: ItemsService){}

我得到这个嵌套错误：

[Nest] 11592 - 2018-8-13 11:42:17 [ExceptionHandler] Nest不能
解析PlayersService的依赖关系（+ ,?）。请确保
索引[1]处的参数在当前上下文中可用。

[Nest] 11592 - 2018-8-13 11:42:17 [ExceptionHandler] Nest can't resolve dependencies of the PlayersService (+, ?). Please make sure that the argument at index [1] is available in the current context.

两个模块都是导入的 app.module.ts 。这两个服务都在他们的模块中单独工作。

Both modules are imported in the app.module.ts. Both services are working alone in their module.

推荐答案

你必须导出 ItemsService 在提供它的模块中：

You have to export the ItemsService in the module that provides it:

@Module({
  controllers: [ItemsController],
  providers: [ItemsService],
  exports: [ItemsService]
  ^^^^^^^^^^^^^^^^^^^^^^^
})
export class ItemsModule {}

然后将其导入使用该服务的模块中：

and then import it in the module that uses the service:

@Module({
  controllers: [PlayersController],
  providers: [PlayersService],
  imports: [ItemsModule]
  ^^^^^^^^^^^^^^^^^^^^^^
})
export class PlayersModule {}

这篇关于从另一个模块注入nestjs服务的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！