nukak

nukak ·

Learn more of nukak on its website https://nukak.org

Quick Start

nukak is a flexible and efficient ORM, with declarative JSON syntax and really smart type-safety.

The nukak queries can be safely written in the frontend (browser/mobile) and sent to the backend; or only use nukak in the backend, or even in a mobile app with an embedded database (like sqlite).

Features

• JSON (serializable) syntax for all the queries.
• uses the power of TypeScript to get smart type-safety everywhere.
• the generated queries are performant, safe, and human-readable.
• $project, $filter, $sort, $limit works at multiple levels (including deep relations and their fields).
• declarative and imperative transactions.
• soft-delete, virtual fields, repositories, connection pooling.
• transparent support for inheritance between entities.
• supports Postgres, MySQL, MariaDB, SQLite, MongoDB.

Installation

1. Install the nukak main package:

npm install nukak --save

1. Install one of the specific adapters for your database:

Database	Driver	Nukak Adapter
MySQL	mysql2	nukak-mysql
MariaDB	mariadb	nukak-maria
SQLite	sqlite sqlite3	nukak-sqlite
PostgreSQL	pg	nukak-postgres
MongoDB	mongodb	nukak-mongo

For example, for Postgres:

npm install pg nukak-postgres --save

1. Additionally, your tsconfig.json may need the following flags:

"target": "es2020",
"experimentalDecorators": true,
"emitDecoratorMetadata": true

Configuration

A default querier-pool can be set in any of the bootstrap files of your app (e.g. in the server.ts).

import { setQuerierPool } from 'nukak';
import { PgQuerierPool } from 'nukak-postgres';

const querierPool = new PgQuerierPool(
  {
    host: 'localhost',
    user: 'theUser',
    password: 'thePassword',
    database: 'theDatabase',
  },
  // optionally, a logger can be passed to log the generated SQL queries
  { logger: console.log }
);

setQuerierPool(querierPool);

Definition of Entities

Take any dump class (aka DTO) and annotate it with the decorators from nukak/entity.

import { v4 as uuidv4 } from 'uuid';
import { Field, ManyToOne, Id, OneToMany, Entity, OneToOne, ManyToMany } from 'nukak/entity/index.js';

@Entity()
export class Profile {
  /**
   * primary-key.
   * the `onInsert` callback can be used to specify a custom mechanism for auto-generating
   * the default value of a field when inserting a new record.
   */
  @Id({ onInsert: uuidv4 })
  id?: string;
  @Field()
  picture?: string;
  /**
   * foreign-keys are really simple to specify.
   */
  @Field({ reference: () => User })
  creatorId?: string;
}

@Entity()
export class User {
  @Id({ onInsert: uuidv4 })
  id?: string;
  @Field()
  name?: string;
  @Field()
  email?: string;
  @Field()
  password?: string;
  /**
   * `mappedBy` can be a callback or a string (callback is useful for auto-refactoring).
   */
  @OneToOne({ entity: () => Profile, mappedBy: (profile) => profile.creatorId, cascade: true })
  profile?: Profile;
}

@Entity()
export class MeasureUnitCategory {
  @Id({ onInsert: uuidv4 })
  id?: string;
  @Field()
  name?: string;
  @OneToMany({ entity: () => MeasureUnit, mappedBy: (measureUnit) => measureUnit.category })
  measureUnits?: MeasureUnit[];
}

@Entity()
export class MeasureUnit {
  @Id({ onInsert: uuidv4 })
  id?: string;
  @Field()
  name?: string;
  @Field({ reference: () => MeasureUnitCategory })
  categoryId?: string;
  @ManyToOne({ cascade: 'persist' })
  category?: MeasureUnitCategory;
}

Query the data

import { getQuerier } from 'nukak';
import { Transactional, InjectQuerier } from 'nukak/querier/index.js';
import { User } from './shared/models/index.js';

export class UserService {
  @Transactional()
  async getUsers(@InjectQuerier() querier?: Querier): Promise<User[]> {
    return querier.findMany(User, {
      $project: { id: true, email: true, profile: ['picture'] },
      $filter: { email: { $iendsWith: '@google.com' } },
      $sort: { createdAt: -1 },
      $limit: 100,
    });
  }
}

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See more in https://nukak.org :high_brightness: