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Multi-database ORM: redis, mongodb, mysql, sqlite, postgres, neo4j, memory... Many databases, common API.

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README.md

About

JugglingDB(3) is cross-db ORM for nodejs, providing common interface to access most popular database formats. Currently supported are: mysql, sqlite3, postgres, couchdb, mongodb, redis, neo4j and js-memory-storage (yep, self-written engine for test-usage only). You can add your favorite database adapter, checkout one of the existing adapters to learn how, it's super-easy, I guarantee.

Jugglingdb also works on client-side (using WebService and Memory adapters), which allows to write rich client-side apps talking to server using JSON API.

Installation

npm install jugglingdb

plus you should install appropriated adapter, for example for redis:

npm install jugglingdb-redis

check following list of available adapters

JugglingDB adapters

Database type Package name Maintainer Build status
Firebird Firebird jugglingdb-firebird Henri Gourvest
MongoDB MongoDB jugglingdb/mongodb-adapter Anatoliy Chakkaev Build Status
MySQL MySQL jugglingdb/mysql dgsan Build Status
CouchDB CouchDB / nano jugglingdb/nano-adapter Nicholas Westlake Build Status
PostgreSQL PostgreSQL jugglingdb/postgres-adapter Anatoliy Chakkaev Build Status
Redis Redis jugglingdb-redis Anatoliy Chakkaev Build Status
SQLite SQLite jugglingdb/sqlite3-adapter Anatoliy Chakkaev Build Status
WebService built-in Anatoliy Chakkaev n/a
Memory (bogus) built-in Anatoliy Chakkaev n/a
Neo4j built-in TODO: move Anatoliy Chakkaev /!\ Looking for maintainer n/a

Participation

If you want to create your own jugglingdb adapter, you should publish your adapter package with name jugglingdb-ADAPTERNAME. Creating adapter is simple, check jugglingdb/redis-adapter for example. JugglingDB core exports common tests each adapter should pass, you could create your adapter in TDD style, check that adapter pass all tests defined in test/common_test.js.

Usage

var Schema = require('jugglingdb').Schema;
var schema = new Schema('redis', {port: 6379}); //port number depends on your configuration
// define models
var Post = schema.define('Post', {
    title:     { type: String, length: 255 },
    content:   { type: Schema.Text },
    date:      { type: Date,    default: function () { return new Date;} },
    timestamp: { type: Number,  default: Date.now },
    published: { type: Boolean, default: false, index: true }
});

// simplier way to describe model
var User = schema.define('User', {
    name:         String,
    bio:          Schema.Text,
    approved:     Boolean,
    joinedAt:     Date,
    age:          Number
}, {
    restPath: '/users' // tell WebService adapter which path use as API endpoint
});

// define any custom method
User.prototype.getNameAndAge = function () {
    return this.name + ', ' + this.age;
};

// models also accessible in schema:
schema.models.User;
schema.models.Post;

// setup relationships
User.hasMany(Post,   {as: 'posts',  foreignKey: 'userId'});
// creates instance methods:
// user.posts(conds)
// user.posts.build(data) // like new Post({userId: user.id});
// user.posts.create(data) // build and save

Post.belongsTo(User, {as: 'author', foreignKey: 'userId'});
// creates instance methods:
// post.author(callback) -- getter when called with function
// post.author() -- sync getter when called without params
// post.author(user) -- setter when called with object

schema.automigrate(); // required only for mysql NOTE: it will drop User and Post tables

// work with models:
var user = new User;
user.save(function (err) {
    var post = user.posts.build({title: 'Hello world'});
    post.save(console.log);
});

// or just call it as function (with the same result):
var user = User();
user.save(...);

// Common API methods

// just instantiate model
new Post
// save model (of course async)
Post.create(cb);
// all posts
Post.all(cb)
// all posts by user
Post.all({where: {userId: user.id}, order: 'id', limit: 10, skip: 20});
// the same as prev
user.posts(cb)
// get one latest post
Post.findOne({where: {published: true}, order: 'date DESC'}, cb);
// same as new Post({userId: user.id});
user.posts.build
// save as Post.create({userId: user.id}, cb);
user.posts.create(cb)
// find instance by id
User.find(1, cb)
// count instances
User.count([conditions, ]cb)
// destroy instance
user.destroy(cb);
// destroy all instances
User.destroyAll(cb);

// Setup validations
User.validatesPresenceOf('name', 'email')
User.validatesLengthOf('password', {min: 5, message: {min: 'Password is too short'}});
User.validatesInclusionOf('gender', {in: ['male', 'female']});
User.validatesExclusionOf('domain', {in: ['www', 'billing', 'admin']});
User.validatesNumericalityOf('age', {int: true});
User.validatesUniquenessOf('email', {message: 'email is not unique'});

user.isValid(function (valid) {
    if (!valid) {
        user.errors // hash of errors {attr: [errmessage, errmessage, ...], attr: ...}    
    }
})

Callbacks

The following callbacks supported:

- afterInitialize
- beforeCreate
- afterCreate
- beforeSave
- afterSave
- beforeUpdate
- afterUpdate
- beforeDestroy
- afterDestroy
- beforeValidate
- afterValidate

Each callback is class method of the model, it should accept single argument: next, this is callback which should be called after end of the hook. Except afterInitialize because this method is syncronous (called after new Model).

Object lifecycle:

var user = new User;
// afterInitialize
user.save(callback); // If Model.id isn't set, save will invoke Model.create() instead
// beforeValidate
// afterValidate
// beforeSave
// beforeUpdate
// afterUpdate
// afterSave
// callback
user.updateAttribute('email', 'email@example.com', callback);
// beforeValidate
// afterValidate
// beforeSave
// beforeUpdate
// afterUpdate
// afterSave
// callback
user.destroy(callback);
// beforeDestroy
// afterDestroy
// callback
User.create(data, callback);
// beforeValidate
// afterValidate
// beforeCreate
// beforeSave
// afterSave
// afterCreate
// callback

Read the tests for usage examples: ./test/common_test.js Validations: ./test/validations.test.js

Your own database adapter

To use custom adapter, pass it's package name as first argument to Schema constructor:

var mySchema = new Schema('mycouch', {host:.., port:...});

In that case your adapter should be named as 'jugglingdb-mycouch' npm package.

Testing

Core of jugglingdb tests only basic features (database-agnostic) like validations, hooks and runs db-specific tests using memory storage. It also exports complete bucket of tests for external running. Each adapter should run this bucket (example from jugglingdb-redis):

var jdb = require('jugglingdb'),
Schema = jdb.Schema,
test = jdb.test;

var schema = new Schema(__dirname + '/..', {host: 'localhost', database: 1});

test(module.exports, schema);

Each adapter could add specific tests to standart bucket:

test.it('should do something special', function (test) {
    test.done();
});

Or it could tell core to skip some test from bucket:

test.skip('name of test case');

To run tests use this command:

npm test

Before running make sure you've installed package (npm install) and if you running some specific adapter tests, ensure you've configured database correctly (host, port, username, password).

Contributing

If you have found a bug please write unit test, and make sure all other tests still pass before pushing code to repo.

License

MIT

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