rymai

TableA
has_and_belongs_to_many :table_b

TableB
has_and_belongs_to_many :table_a

TableC is the join table of TableA and TableB

---------------------------------------
Arel 2.0.4 (Good query)

rymai

require File.join(File.dirname(__FILE__), 'boot')

Rails::Initializer.run do |config|
  # Add additional load paths for your own custom dirs
  config.load_paths += %W[#{Rails.root}/app/mailers]
  
  # Only load the plugins named here, in the order given (default is alphabetical).
  # :all can be used as a placeholder for all plugins not explicitly named
  # config.plugins = [ :exception_notification, :ssl_requirement, :all ]
  

rymai

begin
  require "rubygems"
  require "bundler"
rescue LoadError
  raise "Could not load the bundler gem. Install it with `gem install bundler`."
end

if Gem::Version.new(Bundler::VERSION) <= Gem::Version.new("0.9.24")
  raise RuntimeError, "Your bundler version is too old." +
   "Run `gem install bundler` to upgrade."

rymai

# Don't change this file!
# Configure your app in config/environment.rb and config/environments/*.rb

RAILS_ROOT = "#{File.dirname(__FILE__)}/.." unless defined?(RAILS_ROOT)

module Rails
  class << self
    def boot!
      unless booted?
        preinitialize

rymai

→ bundle -v
Bundler version 0.9.25

→ ruby -v
ruby 1.8.7 (2010-01-10 patchlevel 249) [i686-darwin10.2.0]

→ rvm -v
rvm 0.1.37 by Wayne E. Seguin ([email protected]) [http://rvm.beginrescueend.com/]

passenger version: 2.2.13

rymai

1. Run: rails new_project

2. In Gemfile:
source 'http://rubygems.org'

gem 'rails', '3.0.0.beta3'
gem 'heroku'

gem 'i18n'
gem 'haml'