Sinatra ActiveRecord Mock Server

Gemfile

source 'http://rubygems.org'
gem 'sinatra'
gem 'sinatra-activerecord'
gem 'sqlite3'
gem 'require_all'

mock-server.rb

require 'sinatra'
require 'sinatra/activerecord'
require 'require_all'

# Require ActiveRecord models
require_all '../app/models/*.rb'

# Use UTC timezone
Time.zone = "UTC"
ActiveRecord::Base.default_timezone = :utc

# Disable Concurrency
set :lock, true

before do
  ActiveRecord::Base.logger.level = Logger::ERROR
  
  # Setup in-memory Database
  ActiveRecord::Base.establish_connection({:adapter => 'sqlite3', :database => ':memory:'})
  ActiveRecord::Migration.verbose = false
  ActiveRecord::Migrator.up('../db/migrate')
  ActiveRecord::Base.logger.level = Logger::DEBUG
end

after do
  #nothing yet  
end 

post '/' do
  "Hello World!"
end

# Example POST User
post '/users' do
  post = JSON.parse(request.body.read)
  puts post.inspect

  begin
    raise if User.find_by_id(post["user"]["id"])
    @user = User.create!(post["user"])
    content_type 'application/json'
    status 201
    response = @user.to_json
    puts response
    response
  rescue
    status 400
  end
end

These instructions assume the files are put in your Rails application's spec folder.

Install gems:
$ cd spec
$ bundle install

Start server:
$ ruby -rubygems mock-server.rb