[NestJS] Basic CRUD with Mongoose & NestJS

main.ts

import { NestFactory } from '@nestjs/core';

import { AppModule } from './app.module';

async function bootstrap() {
  const app = await NestFactory.create(AppModule);

  app.setGlobalPrefix('api');

  await app.listen(9000);
}

bootstrap();

 

 

Module:

import { Module } from '@nestjs/common';
import { MongooseModule } from '@nestjs/mongoose';
import { CoursesController } from './controllers/courses.controller';
import { CoursesSchema } from './schemas/courses.schema';
import { CoursesRepository } from './repositories/courses.repository';

@Module({
  imports: [
    MongooseModule.forFeature([
      {
        name: 'Course',
        schema: CoursesSchema,
      },
    ]),
  ],
  controllers: [CoursesController],
  providers: [CoursesRepository],
})
export class CoursesModule {}

 

Schema:

import * as mongoose from 'mongoose';

export const CoursesSchema = new mongoose.Schema({
  seqNo: Number,
  url: String,
  iconUrl: String,
  courseListIcon: String,
  description: String,
  longDescription: String,
  category: String,
  lessonsCount: Number,
  promo: Boolean,
});

 

Controller:

import {
  Controller,
  Get,
  Param,
  Put,
  Body,
  Delete,
  Post,
} from '@nestjs/common';
import { Course } from '../../../../shared/course';
import { CoursesRepository } from '../repositories/courses.repository';

@Controller('courses')
export class CoursesController {
  constructor(private couresDB: CoursesRepository) {}

  @Post()
  async createCourse(@Body() course: Partial<Course>): Promise<Course> {
    return this.couresDB.addCourse(course);
  }

  @Get()
  async findAllCourses(): Promise<Course[]> {
    return this.couresDB.findAll();
  }

  @Put(':courseId')
  async updateCourse(
    @Param('courseId') courseId: string,
    @Body() changes: Partial<Course>,
  ): Promise<Course> {
    return this.couresDB.updateCourse(courseId, changes);
  }

  @Delete(':courseId')
  async deleteCourse(@Param('courseId') courseId: string) {
    return this.couresDB.deleteCourse(courseId);
  }
}

 

Repository:

import { Injectable } from '@nestjs/common';
import { Course } from '../../../../shared/course';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';

@Injectable()
export class CoursesRepository {
  constructor(@InjectModel('Course') private courseModel: Model<Course>) {}

  async addCourse(course: Partial<Course>): Promise<Course> {
    // Create a memory version
    const newCourse = this.courseModel(course);
    // save to db
    await newCourse.save();
    // return the FE version data
    return newCourse.toObject({
      version: false, // without any mongoose props
    });
  }

  async findAll(): Promise<Course[]> {
    return this.courseModel.find();
  }

  async updateCourse(id: string, changes: Partial<Course>): Promise<Course> {
    return this.courseModel.findOneAndUpdate(
      { _id: id },
      changes,
      { new: true }, // return a new version of the data
    );
  }

  async deleteCourse(id: string) {
    return this.courseModel.deleteOne({ _id: id });
  }
}