[SOLVED] Inject nestjs service from another module

Inject nestjs service from another module

I've got a PlayersModule and an ItemsModule.

I want to use the ItemsService in the PlayersService.

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){}

I get this nest error :

[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.

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

Solution

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

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

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

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

⚠️ Don't add the same provider to multiple modules. Export the provider, import the module. ⚠️