_test_active.rb

#!/usr/bin/env ruby
# encoding: UTF-8

$: << File.dirname(__FILE__)
%w(lib ext test).each do |dir|
  $LOAD_PATH.unshift File.expand_path("../../#{dir}", __FILE__)
end

require 'minitest'
require 'minitest/autorun'

require 'sqlite3'
require 'active_record'
require 'oj'

#Oj.mimic_JSON()
Oj.default_options = {mode: :compat, indent: 2}

#ActiveRecord::Base.logger = Logger.new(STDERR)

ActiveRecord::Base.establish_connection(
  :adapter => "sqlite3",
  :database => ":memory:"
)

ActiveRecord::Schema.define do
  create_table :users do |table|
    table.column :first_name, :string
    table.column :last_name, :string
    table.column :email, :string
  end
end

class User < ActiveRecord::Base
end

class ActiveTest < Minitest::Test

  def test_active
    User.find_or_create_by(first_name: "John", last_name: "Smith", email: "john@example.com")
    User.find_or_create_by(first_name: "Joan", last_name: "Smith", email: "joan@example.com")

    # Single instance.
    assert_equal(%|{
  "id":1,
  "first_name":"John",
  "last_name":"Smith",
  "email":"john@example.com"
}
|, Oj.dump(User.first))

    # Array of instances.
    assert_equal(%|[
  {
    "id":1,
    "first_name":"John",
    "last_name":"Smith",
    "email":"john@example.com"
  },
  {
    "id":2,
    "first_name":"Joan",
    "last_name":"Smith",
    "email":"joan@example.com"
  }
]
|, Oj.dump(User.all))

    # Single instance as json. (not Oj)
    assert_equal(%|{"id":1,"first_name":"John","last_name":"Smith","email":"john@example.com"}|, User.first.to_json)

    # Array of instances as json. (not Oj)
    assert_equal(%|[{"id":1,"first_name":"John","last_name":"Smith","email":"john@example.com"},{"id":2,"first_name":"Joan","last_name":"Smith","email":"joan@example.com"}]|, User.all.to_json)

  end
end