Package Exports

nukak-postgres
nukak-postgres/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (nukak-postgres) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

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

Install the nukak main package:

npm install nukak --save

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

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,
    });
  }
}

See more in https://nukak.org 🔆