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The use of cats.controller.ts in nestjs-mongodb-demo, I believe that many inexperienced people do not know what to do, so this paper summarizes the causes of the problem and solutions, through this article I hope you can solve this problem.

/ / 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}), / / name of ajanuw database CatsModule], controllers: [AppController], providers: [AppService],}) export class AppModule {} Model injection / / src/cats/schemas/cat.schema.tsimport * as mongoose from' mongoose';export const CatSchema = new mongoose.Schema ({name: String,}) Use import {Module} from'@ nestjs/common';import {CatsController} from'. / cats.controller';import {CatsService} from'. / cats.service' in cats.module.ts Import {MongooseModule} from'@ nestjs/mongoose'import {CatSchema} from'. / schemas/cat.schema'@Module ({imports: [MongooseModule.forFeature ([/ / Schema defines the structure of the database {name: 'Cat', schema: CatSchema} / / name:' Cat' cats table Cat must be the same as @ InjectModel ('Cat') in service]), controllers: [CatsController], providers: [CatsService]}) CatModelimport {Injectable} from' @ nestjs/common' is injected into export class CatsModule {} cats.service.ts 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 can manipulate the data table) {} async create (cat: CreateCat): Promise {const createdCat = new this.catModel (cat) L (createdCat) / / {_ id: 5b8e2faba163251c9c769e6e Name: 'little black cat'} returns a docment return await createdCat.save () / / save document / / return this.catModel.insertMany (cat)} async findAll (): Promise {return await this.catModel.find (). Exec ()}} cats.controller.tsimport {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 ()} CreateCatexport class CreateCat {readonly name: string } Catimport {Document} from 'mongoose'export interface Cat extends Document {readonly name: string;} complete cats.controller.tsimport {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.tsimport {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

) {} async create (cat: CreateCat): Promise

{/ / const createdCat = new this.catModel (cat) / / return await createdCat.save () return this.catModel.insertMany (cat)} async findAll (): Promise

{return await this.catModel.find () .exec ()} async findCat (name: string): Promise

{if (! name) {throw new HttpException ('request parameters are incorrect.', HttpStatus.FORBIDDEN)} let resCat = this.catModel.find ({name}) return resCat} async updateCatName ({name, newName}) {if (! name | |! newName) {throw new HttpException ('request parameters are incorrect.', 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 ('request parameters are incorrect.', HttpStatus.FORBIDDEN)} return await this.catModel.deleteOne ({name: catName})}} after reading the above, have you mastered how to use cats.controller.ts in nestjs-mongodb-demo? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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