Nest.js操控MongoDB的方法

一、安装 nestjs/mongoose 以及 mongoose 模块

Nest 操作 Mongodb 官方文档：https://docs.nestjs.com/techniques/mongodb

npm install --save @nestjs/mongoose mongoose

二、配置数据库连接地址

在 app.module.ts 中配置数据库连接

import { Module } from '@nestjs/common'; 
import { MongooseModule } from '@nestjs/mongoose'; 

@Module({ 
  imports: [MongooseModule.forRoot('mongodb://localhost/koa',{ useNewUrlParser: true })] 
})

export class ApplicationModule {}

三、配置 Schema

import * as mongoose from 'mongoose'; 

export const ArticleSchema = new mongoose.Schema({ 
  title: String, 
  keywords:String, 
  author: Number, 
  status: String, 
});

四、在控制器对应的 Module 中配置 Model

import { Module } from '@nestjs/common'; 
import { NewsController } from './news.controller'; 
import { NewsService } from './news.service'; 
import { ArticleSchema } from './schemas/article.schema'; 
import { MongooseModule } from '@nestjs/mongoose'; 

@Module({ 
  imports: [MongooseModule.forFeature([{ name: 'Article', schema: ArticleSchema,collection:"article" }])], controllers: [NewsController], 
  providers: [NewsService] 
})

export class NewsModule {}

五、在服务里面使用 InjectModel 获取数据库 Model 实现 操作数据库

import { Injectable } from '@nestjs/common'; 
import { InjectModel } from '@nestjs/mongoose';

@Injectable() 
export class NewsService { 
  constructor(@InjectModel('Article') private readonly articleModel) {} 
  async findAll() { 
    return await this.articleModel.find().exec(); 
  } 
}