Sinatra REST API

A Sinatra component that generates CRUD routes for database ORM models.

Features:

• supports Active Record, Mongoid and Sequel ORMs
• default actions already setup
• nested resources available

Install: gem install sinatra-rest-api (or in Gemfile)

For resource DSL keyword:

• actions: list of actions to enable (array of symbols)
• include: list of associations to expose in list/read actions (array of symbols) or false to skip every association
• limit: set a fixed limit server side
• plural: plural model name used for routes (string)
• singular: singular model name for resource key (string)

Routes parameters:

• limit: limit results (ex. 20)
• offset: results offset (ex. 40)

class Book < ActiveRecord::Base
end

class App < Sinatra::Application
  register Sinatra::RestApi

  resource Book
  resource Category do
    actions [ :list, :read ]
  end
end

Generates:

GET:    /books/:id.?:format?
PUT:    /books/:id.?:format?
DELETE: /books/:id.?:format?
PUT:    /books/?.?:format?
POST:   /books/?.?:format?
DELETE: /books/?.?:format?
GET:    /books/?.?:format?
GET:    /categories/:id.?:format?
GET:    /categories/?.?:format?

See examples. Execute: thin start in the folder of an example.

Let's create an Importer class to import data between 2 Rails app.

A simple way to add an API for every model on the source app:

• create a sinatra app in: lib/sinatra_app/app.rb:

Rails.application.eager_load!  # if cache_classes is off

class MySinatraApp < Sinatra::Base
  register Sinatra::RestApi

  ActiveRecord::Base.descendants.each do |model|  # Iterate all models
    next if model.abstract_class
    resource model, actions: [ :list, :read ], include: false
  end
end

• load the sinatra app editing config/application.rb:

module RailsSinatra
  class Application < Rails::Application
    config.after_initialize do
      require_relative '../lib/sinatra_app/app'
    end
  end
end

• setup the routes editing config/routes.rb:

Rails.application.routes.draw do
  mount MySinatraApp.new => '/sinatra'
end

• now you can access to every model under 'sinatra' path, example: '/sinatra/posts.json'

• on the destination app you can access these models using ActiveResource gem:

class Importer < ActiveResource::Base
  self.site = 'http://127.0.0.1:3000/sinatra'  # first app path

  def self.init( collection_name )
    set_collection_name collection_name
    self
  end
end

# List of tags names:
Importer.init( 'tags' ).all.map( &:name )

Run individual example apps tests:

• rspec spec/app_active_record_spec.rb
• rspec spec/app_mongoid_spec.rb
• rspec spec/app_sequel_spec.rb

If you use this component just star it. A developer is more motivated to improve a project when there is some interest.

• Mattia Roccoberton - creator, maintainer

ISC