Nest 无法解析 JobsService (?) 的依赖关系。请确保索引 [0] 处的参数 JobModel 在 AppModule 上下文中可用

Posted 2023-03-10

【中文标题】Nest 无法解析 JobsService (?) 的依赖关系。请确保索引 [0] 处的参数 JobModel 在 AppModule 上下文中可用

【英文标题】：Nest can't resolve dependencies of the JobsService (?). Please make sure that the argument JobModel at index [0] is available in the AppModule context

【发布时间】：2021-03-10 23:53:27

【问题描述】：

我真的很困惑，我遇到了这个奇怪的错误，我不知道。

错误：Nest 无法解析 JobsService (?) 的依赖项。请确保索引 [0] 处的参数 JobModel 在 AppModule 上下文中可用。

app.module.ts

import  Module  from '@nestjs/common';
import  AppController  from './app.controller';
import  AppService  from './app.service';
import  MongooseModule  from '@nestjs/mongoose';
import  JobsModule  from './jobs/jobs.module';
import  JobsService  from './jobs/jobs.service';
import  JobsController  from './jobs/jobs.controller';
import config from './config/config';

@Module(
  imports: [JobsModule, MongooseModule.forRoot(config.mongoURI, 
      useFindAndModify: false,
  )],
  controllers: [AppController, JobsController],
  providers: [AppService, JobsService], 
)
export class AppModule 

/jobs/jobs.module.ts

import  Module  from '@nestjs/common';
import  MongooseModule  from '@nestjs/mongoose';
import  JobsService  from './jobs.service';
import  JobsController  from './jobs.controller';
import  JobsSchema  from './schemas/jobs.schema';

@Module(
  imports: [MongooseModule.forFeature([ name: 'Job', schema: JobsSchema ])],
  controllers: [JobsController],
  providers: [JobsService],
)
export class JobsModule 

/job/job.controller.ts

import  Controller, Get, Post, Put, Delete, Body, Param  from '@nestjs/common';
import  JobsService  from './jobs.service';
import  IJobs  from './interfaces/jobs.interface';

@Controller('jobs')
export class JobsController 
    constructor(private readonly jobsService: JobsService)
    
    @Get()
    findAll():Promise<IJobs[]> 
        return this.jobsService.findAll();
    

/job/jobs.service.ts

import  Injectable  from '@nestjs/common';
import  InjectModel  from '@nestjs/mongoose';
import  Model  from 'mongoose';
import  IJobSchema  from './schemas/jobs.schema';
import  IJobs  from './interfaces/jobs.interface';

@Injectable()
export class JobsService 
    constructor(@InjectModel('Job') private readonly JobsModel: Model<IJobSchema>)
    
    async findAll():Promise<IJobs[]> 
        return await this.JobsModel.find();
    

【问题讨论】：

Might help to go over the page of common errors

【参考方案1】：

你已经在你的 JobModule 中声明了 JobsService，从 Appmodule 提供者中删除它

 import  Module  from '@nestjs/common';
import  AppController  from './app.controller';
import  AppService  from './app.service';
import  MongooseModule  from '@nestjs/mongoose';
import  JobsModule  from './jobs/jobs.module';
import  JobsService  from './jobs/jobs.service';
import  JobsController  from './jobs/jobs.controller';
import config from './config/config';

@Module(
  imports: [JobsModule, MongooseModule.forRoot(config.mongoURI, 
      useFindAndModify: false,
  )],
  controllers: [AppController, JobsController],
  providers: [AppService], // Here..
)
export class AppModule