Leoric


Leoric is an object-relational mapping library for Node.js, which is heavily influenced by Active Record of Ruby on Rails. See the documentation for detail.

Usage

Assume the tables of posts, users, and comments were setup already. We may declare the models as classes by extending from the base class Bone of Leoric. After the models are connected to the database, the columns of the tables are mapped as attributes, the associations are setup, feel free to start querying.

``js
const { Bone, connect } = require('leoric')

// define model
class Post extends Bone {
static initialize() {
this.belongsTo('author', { Model: 'User' })
this.hasMany('comments')
}
}

async function main() {
// connect models to database
await connect({ host: 'example.com', models: [ Post ], / among other options / })

// CRUD
await Post.create({ title: 'New Post' })
const post = await Post.findOne({ title: 'New Post' })
post.title = 'Untitled'
await post.save()

// or UPDATE directly
await Post.update({ title: 'Untitled' }, { title: 'New Post' })

// find with associations
const post = await Post.findOne({ title: 'New Post' }).with('comments')
console.log(post.comments) // => [ Comment { id, content }, ... ]
}
`

If table structures were intended to be maintained in the models, Leoric can be used as a table migration tool as well. We can just define attributes in the models, and call realm.sync() whenever we are ready.

`js
const { BIGINT, STRING } = Bone.DataTypes;
class Post extends Bone {
static attributes = {
id: { type: BIGINT, primaryKey: true },
email: { type: STRING, allowNull: false },
nickname: { type: STRING, allowNull: false },
}
}

const realm = new Realm({ models: [ Post ] });
await realm.sync();
`

Syntax Table

| JavaScript | SQL |
|-----------------------------------------|----------------------------------------------------|
| Post.create({ title: 'New Post' }) | INSERT INTO posts (title) VALUES ('New Post') |
| Post.all | SELECT * FROM posts |
| Post.find({ title: 'New Post' }) | SELECT * FROM posts WHERE title = 'New Post' |
| Post.find(42) | SELECT * FROM posts WHERE id = 42 |
| Post.order('title') | SELECT * FROM posts ORDER BY title |
| Post.order('title', 'desc') | SELECT * FROM posts ORDER BY title DESC |
| Post.limit(20) | SELECT * FROM posts LIMIT 0, 20 |
| Post.update({ id: 42 }, { title: 'Skeleton King' }) | UPDATE posts SET title = 'Skeleton King' WHERE id = 42 |
| Post.remove({ id: 42 }) | DELETE FROM posts WHERE id = 42 |

A more detailed syntax table may be found at the documentation site.

TypeScript charged

`ts
import { Bone, BelongsTo, Column, DataTypes: { TEXT } } from 'leoric';
import User from './user';

export default class Post extends Bone {
@Column({ autoIncrement: true })
id: bigint;

@Column(TEXT)
content: string;

@Column()
description: string;

@Column()
userId: bigint;

@BelongsTo()
user: User;
}
`

More about TypeScript integration examples can be found at the TypeScript support documentation

Contributing

There are many ways in which you can participate in the project, for example:

- Submit bugs and feature requests, and help us verify as they are checked in
- Review source code changes
- Review the documentation and make pull requests for anything from typo to new content

If you are interested in fixing issues and contributing directly to the code base, please see the document How to Contribute, which covers the following:

- The development workflow, including debugging and running tests
- Coding guidelines
- Submitting pull requests
- Contributing to translations

egg-orm

If developing web applications with egg framework, it's highly recommended using the egg-orm plugin. More detailed examples about setting up egg-orm with egg framework in either JavaScript or TypeScript can be found at

mysql nuances

macOS binds localhost to ipv6 ::1, yet both mysql and mysql2 connect database with localhost by default, which means both will try connecting to mysql with ::1. However, the mysql distribution installed with HomeBrew sets bind_address = 127.0.0.1, hence causes following error:

`js
Error: connect ECONNREFUSED ::1:3306
at __node_internal_captureLargerStackTrace (node:internal/errors:490:5)
at __node_internal_exceptionWithHostPort (node:internal/errors:668:12)
at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1494:16)
`

Please change the configuration as below:

`diff
diff --git a/usr/local/etc/my.cnf b/usr/local/etc/my.cnf
index 7218354..d31859c 100644
--- a/usr/local/etc/my.cnf
+++ b/usr/local/etc/my.cnf
@@ -1,5 +1,5 @@
# Default Homebrew MySQL server config
[mysqld]
# Only allow connections from localhost
-bind-address = 127.0.0.1
+bind-address = 127.0.0.1,::1
mysqlx-bind-address = 127.0.0.1
`

and restart the mysql service:

`bash
brew services mysql restart
``