Simple Active Record Scratch Pad

.simple-active-record-scratch-pad

Gemfile

source 'https://rubygems.org'
gem 'sqlite3'
gem 'activerecord'

Gemfile.lock

GEM
  remote: https://rubygems.org/
  specs:
    activemodel (4.0.0)
      activesupport (= 4.0.0)
      builder (~> 3.1.0)
    activerecord (4.0.0)
      activemodel (= 4.0.0)
      activerecord-deprecated_finders (~> 1.0.2)
      activesupport (= 4.0.0)
      arel (~> 4.0.0)
    activerecord-deprecated_finders (1.0.3)
    activesupport (4.0.0)
      i18n (~> 0.6, >= 0.6.4)
      minitest (~> 4.2)
      multi_json (~> 1.3)
      thread_safe (~> 0.1)
      tzinfo (~> 0.3.37)
    arel (4.0.0)
    atomic (1.1.14)
    builder (3.1.4)
    i18n (0.6.5)
    minitest (4.7.5)
    multi_json (1.8.0)
    sqlite3 (1.3.8)
    thread_safe (0.1.3)
      atomic
    tzinfo (0.3.37)

PLATFORMS
  ruby

DEPENDENCIES
  activerecord
  sqlite3

Rakefile

task default: :console

task :console do
  require 'irb'
  require './scratch'
  ARGV.clear
  IRB.start
end

scratch.rb

require 'logger'
require 'sqlite3'
require 'active_record'

def reload!
  load __FILE__
end

def migrate!
  ActiveRecord::Schema.define do
    create_table :users do |t|
      t.string :name
    end
  end
end

ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)
ActiveRecord::Base.logger.formatter = proc { |*_, msg| "#{msg.to_s.strip}\n" }

class User < ActiveRecord::Base
  before_save   { logger.info :before_save }
  after_save    { logger.info :after_save }
  before_create { logger.info :before_create }
  after_create  { logger.info :after_create }
end