NestJS CRUD Service with Mongoose

This repository provides a robust CRUD service using NestJS and Mongoose, designed to simplify the development of database interactions with built-in transaction support via Async Local Storage.

Features

• CRUD Operations: Simplify create, read, update, and delete operations using Mongoose.
• Transaction Management: Handle transactions smoothly and reliably in your services.
• Async Local Storage: Utilize Async Local Storage for context management throughout the life of a request.

Prerequisites

Before you begin, ensure you have met the following requirements:

• You have installed Node.js
• You have a MongoDB server running (local or remote)

Installation

To install, follow these steps:

npm install @liashchynskyi/nestjs-codex --save

Make sure you have these installed in your NestJS project:

• "@nestjs/common": ">=8.0.0"
• "@nestjs/mongoose": ">=6.5.0-next.3"
• "mongoose": ">=6.10.4"

Usage

Import the module

In your app.module.ts file add the following module to the AppModule imports.

CrudModule.forRoot();

forRoot() method accepts an optional configuration object with the properties of ClsModuleOptions imported from nestjs-cls package. The defaults are the following:

{
  global: true,
  middleware: {
    mount: true,
    useEnterWith: true,
  },
}

nestjs-cls is used to handle transactions. Specifically, it is used to pass session object all the way down to the database layer.

Create a service

For example, let's create a UserService that will handle CRUD operations for User model.

Define Mongoose models.

import { Document } from 'mongoose';
import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose';

export type UserDocument = UserEntity & Document;

@Schema({ timestamps: true, autoIndex: true, collection: 'users' })
export class UserEntity {
  @Prop({ required: true })
  name: string;
}

export const UserSchema = SchemaFactory.createForClass(UserEntity);

Use CrudService as a base class for your service.

import { Injectable } from '@nestjs/common';
import { CrudService } from '@liashchynskyi/nestjs-codex';

@Injectable()
export class UserService extends CrudService<UserDocument>(UserEntity) {
  constructor() {
    super();
  }
}

That's it! Now you can use UserService with all available methods in your controllers. As simple as that! No need to write all those CRUD methods yourself.

For example, to create a new user:

const user = await this.userService.create({ name: 'John Doe' });

Extend methods

In some use cases you may want to change the default behavior of the service. For example, you may want to validate input DTO before creating a new document. To do that, you can create a new method and then use super call:

import { Injectable } from '@nestjs/common';
import { CrudService } from '@liashchynskyi/nestjs-codex';

@Injectable()
export class UserService extends CrudService<UserDocument>(UserEntity) {
  constructor() {
    super();
  }

  async _create(dto: CreateUserDto): Promise<User> {
    await this.validate(dto);

    return super.create(dto); // must call super.create() to create a new document
  }
}

Transactions

Transactions are not applied automatically. You need to wrap critical operations in a transaction manually. To do that, you should use TransactionService. For example, let's extend our UserService to create a new user using a transaction:

import { Injectable } from '@nestjs/common';
import { CrudService } from '@liashchynskyi/nestjs-codex';
import { TransactionService } from '@liashchynskyi/nestjs-codex';

@Injectable()
export class UserService extends CrudService<UserDocument>(UserEntity) {
  constructor(private readonly transactionService: TransactionService) {
    super();
  }

  async _create(dto: CreateUserDto): Promise<User> {
    return this.transactionService.run(async (session) => {
      await this.validate(dto);

      return super.create(dto);
    });
  }
}

Thanks to cls the session object will be handled automatically in required CRUD operations of CrudService. In some cases you may want to pass session object manually to other methods. That's why it is the only parameter of the run method's callback.

Available CRUD methods

Available methods are defined in the CrudSignature interface.

export interface CrudSignature<T extends Document> {
  aggregation<ReturnedType>(pipelines: any[], options?: AggregateOptions): Promise<ReturnedType[]>;

  findOne(filter: FilterOrId<T>, options?: FindOneOptions & WithError): Promise<T>;
  findOne(filter: FilterOrId<T>, options?: FindOneOptions & WithoutError): Promise<T | null>;
  findOne(filter: FilterOrId<T>, options: WithoutError): Promise<T | null>;

  findMany(
    filter?: FilterQuery<T>,
    options?: FindManyOptions & {
      pagination: Pagination;
    },
  ): Promise<PaginationResult<T>>;
  findMany(filter?: FilterQuery<T>, options?: FindManyOptions & WithError): Promise<T[]>;
  findMany(filter?: FilterQuery<T>, options?: FindManyOptions & WithoutError): Promise<T[]>;

  isExists(filter: FilterQuery<T>, options?: IsExistsOptions & WithError): Promise<true>;
  isExists(filter: FilterQuery<T>, options?: IsExistsOptions & WithoutError): Promise<boolean>;
  isExists(filter: FilterQuery<T>, options: WithoutError): Promise<true | boolean>;

  count(filter: FilterQuery<T>): Promise<number>;

  create(data: MongooseAnyKeys<T>): Promise<T>;
  create(data: MongooseAnyKeys<T>[]): Promise<T[]>;
  create(data: MongooseAnyKeys<T>[] | MongooseAnyKeys<T>): Promise<T[] | T>;

  updateOne(filter: FilterOrId<T>, data: MongooseUpdateQuery<T>, options?: UpdateOptions & WithError): Promise<T>;
  updateOne(
    filter: FilterOrId<T>,
    data: MongooseUpdateQuery<T>,
    options?: UpdateOptions & WithoutError,
  ): Promise<T | null>;
  updateOne(filter: FilterOrId<T>, data: MongooseUpdateQuery<T>, options: WithoutError): Promise<T | null>;

  updateMany(filter: FilterQuery<T>, data: MongooseUpdateQuery<T>, options?: UpdateOptions & WithError): Promise<T[]>;
  updateMany(
    filter: FilterQuery<T>,
    data: MongooseUpdateQuery<T>,
    options?: UpdateOptions & WithoutError,
  ): Promise<T[] | []>;
  updateMany(filter: FilterQuery<T>, data: MongooseUpdateQuery<T>, options: WithoutError): Promise<T[] | []>;

  deleteOne(filter: FilterOrId<T>, options?: CrudQueryOptions & WithError): Promise<T>;
  deleteOne(filter: FilterOrId<T>, options?: CrudQueryOptions & WithoutError): Promise<T | null>;
  deleteOne(filter: FilterOrId<T>, options: WithoutError): Promise<T | null>;

  deleteMany(filter: FilterQuery<T>, options?: CrudQueryOptions & WithError): Promise<T[]>;
  deleteMany(filter: FilterQuery<T>, options?: CrudQueryOptions & WithoutError): Promise<T[] | []>;
  deleteMany(filter: FilterQuery<T>, options: WithoutError): Promise<T[] | []>;
}

Contributing

Any contributions are welcomed. Please follow the below guidelines before contributing:

• Fork the repository and create your branch from main.
• Install the dependencies.
• Make sure your code lints.
• Issue that pull request!

License

Distributed under the MIT License. See LICENSE for more information.

Contact

Petro Liashchynskyi - @liashchynskyi | liashchynskyi.net