NestJS 无法解析 UserController 的依赖关系答案

【问题标题】：NestJS can't resolve dependencies of the UserControllerNestJS 无法解析 UserController 的依赖关系
【发布时间】：2018-12-25 10:16:53
【问题描述】：

当前行为

尝试在我的 UserController.ts 中使用我的 UserService.ts 和 AuthService.ts，但我收到以下错误： [ExceptionHandler] Nest can't resolve dependencies of the UserController (?, +). Please make sure that the argument at index [0] is available in the current context.

用指令最小化重现问题

应用程序.module.ts

import { Module } from "@nestjs/common";
import { ApplicationController } from "controllers/application.controller";
import { ApplicationService } from "services/application.service";
import { AuthModule } from "./auth.module";
import { UserModule } from "./user.module";

@Module({
  imports: [
    AuthModule,
    UserModule,
  ],
  controllers: [
    ApplicationController,
  ],
  providers: [
    ApplicationService,
  ],
})
export class ApplicationModule {}

用户模块.ts

import { Module } from "@nestjs/common";
import { UserController } from "controllers/user.controller";

@Module({
  controllers: [
    UserController,
  ],
})
export class UserModule {}

用户服务.ts

import { Injectable } from "@nestjs/common";
import { InjectRepository } from "@nestjs/typeorm";
import { Repository } from "typeorm";
import { UserEntity } from "entities/user.entity";

@Injectable()
export class UserService {
  constructor(
    @InjectRepository(UserEntity)
    private readonly repository: Repository<UserEntity>,
  ) {}

  async findAll(): Promise<UserEntity[]> {
    return await this.repository.find();
  }
}

auth.module.ts

import { Module } from "@nestjs/common";
import { JwtModule } from "@nestjs/jwt";
import { AuthService } from "services/auth.service";

@Module({
  imports: [
    JwtModule.register({
      secretOrPrivateKey: "key12345",
    }),
  ],
})
export class AuthModule {}

auth.service.ts

import { Injectable } from "@nestjs/common";
import { JwtService } from "@nestjs/jwt";
import { TokenJwtInterface } from "interfaces/token-jwt.interface";

@Injectable()
export class AuthService {
  private tokenType;

  constructor(private readonly jwtService: JwtService) {
    this.tokenType = "bearer";
  }

  public generateTokenJwt(
    payload: object,
    expiresIn: number,
  ): TokenJwtInterface {
    const accessToken = this.jwtService.sign(payload);

    return {
      access_token: accessToken,
      token_type: this.tokenType,
      refresh_token: "",
      expires_in: expiresIn,
    };
  }
}

用户控制器.ts

import {
  Get,
  Controller,
  Post,
  Body,
  HttpCode,
  HttpStatus,
} from "@nestjs/common";
import { UserService } from "services/user.service";
import { UserEntity } from "entities/user.entity";
import * as bcrypt from "bcryptjs";
import { AuthService } from "services/auth.service";

@Controller("/users")
export class UserController {
  constructor(
    private readonly userService: UserService,
    private readonly authService: AuthService,
  ) {}

  @Get()
  async root(): Promise<UserEntity[]> {
    return await this.userService.findAll();
  }
...

改变行为的动机/用例是什么？

错误修正？

环境

嵌套版本：5.1.0 对于工具问题： - 节点版本：v8.11.3 - 平台：Ubuntu - IDE：VSC

【问题讨论】：

从概念上讲，我遇到了与 NestJS 依赖项相同的问题，它与 HttpService 有关。这篇文章有解决方案mydaytodo.com/…

标签： typescript nestjs

【解决方案1】：

您的AuthService 必须是您的UserModule 的一部分

import { Module } from "@nestjs/common";
import { UserController } from "controllers/user.controller";

@Module({
   controllers: [
     UserController,
   ],
   components: [
     UserService,
     AuthService
   ],
   imports: [
     AuthModule 
   ]
})
export class UserModule {}

我一直认为 importing 一些模块就足够了，但根据我的经验，我总是必须在 components 部分声明它。

我还意识到您忘记在组件的模块中声明 UserService

【讨论】：