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FastLegS

PostgreSQL ORM on top of node-postgres

FastLegS

PostgreSQL ORM on top of node-postgres.

npm install FastLegS

NOTE: As of version0.2.0, both PostgreSQL and MySQL are supported. You indicate which database you are using at object instantiation time. All other operations and interfaces behave the same as older versions.

var FastLegS = require('FastLegS');
...
FastLegS.connect(connectionParams);
...
var FastLegSBase = require('FastLegS');
var FastLegS = new FastLegSBase('mysql');
...
FastLegS.connect(connectionParams);
...
var FastLegSBase = require('FastLegS');
var FastLegS = new FastLegSBase('pg');
...
FastLegS.connect(connectionParams);
...
var FastLegSBase = require('FastLegS');

// gonna use PostgreSQL
var FastLegS = new FastLegSBase('pg');

var connectionParams = {
  user: 'shes'
, password: 'got'
, database: 'legs'
, host: 'localhost'
, port: 5432
}

FastLegS.connect(connectionParams);

var Post = FastLegS.Base.extend({
  tableName: 'posts',
  primaryKey: 'id'
});

Post.create(
  { title: 'Some Title 1', body: 'Some body 1' }, 
  function(err, results) {
    Post.find(
      { 'title.ilike': '%title%' }, 
      { only: ['id', 'body'] }, 
      function(err, post) {
        // Hooray!
      }
    );
  }
);

The Full Monty

The following examples use these database tables as examples:

id title blurb body published
1 Some Title 1 Some blurb 1 Some body 1 false
2 Some Title 1 Some blurb 2 Some body 2 true
3 Some Title 1 Some blurb 3 Some body 3 false
4 Some Title 1 Some blurb 4 Some body 4 true
id post_id comment created_at
1 1 Comment 1 2012-12-11
2 1 Comment 2 2012-12-11
3 2 Comment 3 2012-12-11
4 2 Comment 4 2012-12-11
5 3 Comment 5 2012-12-11
6 3 Comment 6 2012-12-11
7 4 Comment 7 2012-12-11
8 4 Comment 8 2012-12-11

Given this setup:

var FastLegSBase = require('FastLegS');

// gonna use PostgreSQL
var FastLegS = new FastLegSBase('pg');

var connectionParams = {
  user: 'shes', password: 'got',
  database: 'legs', host: 'localhost', port: 5432
}

FastLegS.connect(connectionParams);

var callback = function(err, results) {
  console.dir(err);
  console.dir(results);
}

var Comment = FastLegS.Base.extend({
  tableName: 'comments',
  primaryKey: 'id'
});

var Post = FastLegS.Base.extend({
  tableName: 'posts',
  primaryKey: 'id'
});

The following are examples of basic CRUD operations:

Calls to create can take an object or an array of objects.

Post.create(
  { id: 5, title: 'Some Title 5', body: 'Some body 5' },
  callback
)

Post.create(
  [{ id: 6, title: 'Some Title 6', body: 'Some body 6' },
   { id: 7, title: 'Some Title 7', body: 'Some body 7' }],
  callback
)

The results passed to the callback are different depending on the database.

In the case of PostgreSQL, the results will be an object of the form:

{
  rows: [{ id: 5,
         title: 'Some Title 5',
         blurb: null,
         body: 'Some body 5',
         published: null }],
  command: INSERT,
  rowCount: 1,
  oid: 0
}

In the case of MySQL, the results will be an object of the form:

{
  fieldCount: 0,
  affectedRows: 1,
  insertId: 0,
  serverStatus: 2,
  warningCount: 0,
  message: ''
}

The various forms of the find command are very flexible. We'll present a few of them here.

Post.find({}, callback)

outputs:

[ 
  { id: 1,
    title: 'Some Title 1',
    blurb: null,
    body: 'Some body 1',
    published: null,
    created_at: null,
    updated_at: null },
  ...
  { id: 5,
    title: 'Some Title 5',
    blurb: null,
    body: 'Some body 5',
    published: null,
    created_at: null,
    updated_at: null },
  { id: 6,
    title: 'Some Title 6',
    blurb: null,
    body: 'Some body 6',
    published: null,
    created_at: null,
    updated_at: null },
  { id: 7,
    title: 'Some Title 7',
    blurb: null,
    body: 'Some body 7',
    published: null,
    created_at: null,
    updated_at: null } 
]
Post.find(6, callback)

outputs:

{
  id: 6,
  title: 'Some Title 6',
  blurb: null,
  body: 'Some body 6',
  published: null,
  created_at: null,
  updated_at: null
}
Post.find(6, {only: ['id','title']}, callback)

outputs:

{ id: 6, title: 'Some Title 6' }
Post.find({'title.like': 'Some%'}, callback)
Post.find({'id.in': [6, 7]}, callback)
Post.find({'id.nin': [6]}, callback)
Post.find({'$or': {'id.equals': 5, 'body.like': '%body 7'}}, callback)
Post.find({}, { order: ['-id'] }, callback)
Post.find({}, { offset: 1, limit: 1 }, callback)
Post.find({}, {count: true}, callback)

outputs:

{ count: 7 }
Post.update(
  { title: 'Some Title 6' },
  { title: 'Renamed title' },
  callback
)
Post.destroy({ 'id.in': [5, 7]}, callback)
Post.truncate(callback)

You can call out relationships when you extend FastLegS.Base:

var Post = FastLegS.Base.extend({
  tableName: 'posts',
  primaryKey: 'id',
  many: [
    { 'comments': Comment, joinOn: 'post_id' }
  ]
});

You can then create complex object relationships with join logic:

Post.find(
  {}, 
  { include: { comments: { only: ['id', 'comment'] } } },
  callback
)

outputs:

[
  {
      body: 'Some body 1',
      title: 'Some Title 1',
      id: 1,
      updated_at: null,
      published: false,
      blurb: 'Some blurb 1',
      created_at: null,
      comments: [
          { id: 1, comment: 'Comment 1' },
          { id: 2, comment: 'Comment 2' }
      ]
  },
  {
      body: 'Some body 2',
      title: 'Some Title 2',
      id: 2,
      updated_at: null,
      published: true,
      blurb: null,
      created_at: null,
      comments: [
          { id: 3, comment: 'Comment 3' },
          { id: 4, comment: 'Comment 4' }
      ]
  },
  ...
]

Here's a many-to-many example based on these tables:

id name
1 Abe
2 Ben
3 Christine
4 Delia
5 Egwene
id name
6 Felix
7 Garret
8 Horton
9 Irene
10 Jane
student_id professor_id
1 6
2 6
3 7
4 7
5 8
1 8
2 9
3 9
4 10
5 10
var Student = FastLegS.Base.extend({
  tableName: 'students',
  primaryKey: 'id',
});

var Professor = FastLegS.Base.extend({
  tableName: 'professors',
  primaryKey: 'id',
})

var StudentProfessor = FastLegS.Base.extend({
  tableName: 'student_professor',
  foreignKeys: [
     { model: Student, key: 'student_id' },
     { model: Professor, key: 'professor_id' }
  ]
})

Student.many = [{
  professors: Professor,
  assoc: StudentProfessor
}]

Professor.many = [{
  students: Student,
  assoc: StudentProfessor
}]

Professor.findOne(
  9,
  {include: { students: {} }},
  function(err, result) {
    inspect(result)
  }
)

outputs:

{
  id: 9,
  name: 'Irene',
  students: [
      { id: 2, name: 'Ben' },
      { id: 3, name: 'Christine' }
  ]
}

This shows that professor Irene has students Ben and Christine

The tests are an excellent reference for the various modifiers and syntactic sugar you can use in FastLegS.

Right now, the codebase is split because of syntactic differences between PostgreSQL and MySQL. There is a lot of duplicated code, however. Future versions should abstract out the differences and merge the duplicated code.

Watch for updates to examples in the near future to show features like relationships and advanced queries.

Contributors