nestjs-mongodb-demo中cats.controller.ts的使用方法

nestjs-mongodb-demo中cats.controller.ts的使用方法，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

// sec/app.module.tsimport { Module }from '@nestjs/common';import { AppController } from './app.controller';import { AppService } from './app.service';import { MongooseModule } from '@nestjs/mongoose'import { CatsModule } from './cats/cats.module';@Module({  imports: [    MongooseModule.forRoot('mongodb://localhost/ajanuw'， { useNewUrlParser: true }), // ajanuw数据库的名字    CatsModule  ],  controllers: [AppController],  providers: [AppService],})export class AppModule {}

模型注入

// src/cats/schemas/cat.schema.tsimport * as mongoose from 'mongoose';export const CatSchema = new mongoose.Schema({  name: String,});

cats.module.ts 中使用

import { Module } from '@nestjs/common';import { CatsController } from './cats.controller';import { CatsService } from './cats.service';import { MongooseModule } from '@nestjs/mongoose'import { CatSchema } from './schemas/cat.schema'@Module({  imports: [    MongooseModule.forFeature([ // Schema 定义数据库的结构      { name: 'Cat', schema: CatSchema } // name: 'Cat'  cats 表， Cat 必须和service时@InjectModel('Cat')的一样    ])  ],  controllers: [CatsController],  providers: [CatsService]})export class CatsModule {}

cats.service.ts 中注入 CatModel

import { Injectable } from '@nestjs/common';import { Model } from 'mongoose'import { InjectModel } from '@nestjs/mongoose'import { Cat } from './interfaces/cat.interface'import { CreateCat } from './class/create-cat.class'const l = console.log@Injectable()export class CatsService {  constructor(    @InjectModel('Cat') private readonly catModel: Model  // Model 可以操作数据表  ){}  async create(cat: CreateCat): Promise {    const createdCat = new this.catModel(cat)    l(createdCat) // { _id: 5b8e2faba163251c9c769e6e, name: '小黑猫' }  返回一个docment    return await createdCat.save()  // 保存 document    //  return this.catModel.insertMany(cat)  }  async findAll(): Promise {    return await this.catModel.find().exec()  }}

cats.controller.ts

import { Controller, Get, Post, Body } from '@nestjs/common';import { CatsService } from './cats.service'import { CreateCat } from './class/create-cat.class'const l = console.log;@Controller('cats')export class CatsController {  constructor(    private readonly catsServer: CatsService  ){}  @Post()  create(@Body() cat: CreateCat){     this.catsServer.create(cat);  }  @Get()  findAll(){    return this.catsServer.findAll()  }}

CreateCat

export class CreateCat {  readonly name: string;}

Cat

import { Document } from 'mongoose'export interface Cat extends Document {  readonly name: string;}

完整的 cats.controller.ts

import { Controller, Get, Post, Body, Query, Delete } from '@nestjs/common';import { CatsService } from './cats.service'import { CreateCat } from './class/create-cat.class'const l = console.log;@Controller('cats')export class CatsController {  constructor(    private readonly catsServer: CatsService  ){}  @Post()  create(@Body() cat: CreateCat){     this.catsServer.create(cat);  }  @Get()  findAll(){    return this.catsServer.findAll()  }  @Get('find-cat')  findCat(@Query('catName') catName){    return this.catsServer.findCat(catName)  }  @Post('update-cat-name')  updateCatName(@Body() body){    this.catsServer.updateCatName(body)  }  @Delete('remove-cat')  removeCat(@Body('catName') catName){    this.catsServer.removeCat(catName)  }}

cats.service.ts

import {  Injectable,  HttpException,  HttpStatus} from '@nestjs/common';import {  Model} from 'mongoose'import {  InjectModel} from '@nestjs/mongoose'import {  Cat} from './interfaces/cat.interface'import {  CreateCat} from './class/create-cat.class'const l = console.log;@Injectable()export class CatsService {  constructor(    @InjectModel('Cat') private readonly catModel: Model < Cat >  ) {}  async create(cat: CreateCat): Promise < Cat > {    // const createdCat = new this.catModel(cat)    // return await createdCat.save()    return this.catModel.insertMany(cat)  }  async findAll(): Promise < Cat[] > {    return await this.catModel.find().exec()  }  async findCat(name: string): Promise < Cat[] > {    if (!name) {      throw new HttpException('请求参数不正确.', HttpStatus.FORBIDDEN)    }    let resCat = this.catModel.find({      name    })    return resCat  }  async updateCatName({name, newName}) {    if(!name || !newName){      throw new HttpException('请求参数不正确.', HttpStatus.FORBIDDEN)    }     const where = {        name: name    };    const update = {        $set: {            name: newName        }    };    return await this.catModel.updateOne(where, update);     }  async removeCat(catName){    l(catName)    if(!catName){      throw new HttpException('请求参数不正确.', HttpStatus.FORBIDDEN)    }    return await this.catModel.deleteOne({name: catName})  }}

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