undefined method `alias_method_chain' in activ

This is my Rakefile

require 'bundler'
Bundler.setup
require 'active_record'
require 'sqlite3'
require 'yaml'
require 'logger'

task :migrate => :environment do
   ActiveRecord::Migrator.migrate('db/migrate', ENV["VERSION"] ? ENV["VERSION"].to_i : nil )
end

task :environment do
  ActiveRecord::Base.establish_connection(YAML::load(File.open('config/database.yaml'))['development'])
  ActiveRecord::Base.logger = Logger.new(STDOUT)
end

When I execute the task I got this error:

rake aborted!
/usr/local/rvm/gems/ruby-2.0.0-p0@ta/gems/activerecord-2.3.18/lib/active_record/base.rb:2449: warning: already initialized constant Class::VALID_FIND_OPTIONS
/usr/local/rvm/gems/ruby-2.0.0-p0@ta/gems/activerecord-2.3.18/lib/active_record/base.rb:2449: warning: previous definition of VALID_FIND_OPTIONS was here
undefined method `alias_method_chain' for #<Class:0x00000001606340>
/usr/local/rvm/gems/ruby-2.0.0-p0@ta/gems/activerecord-2.3.18/lib/active_record/base.rb:2002:in `method_missing'
/usr/local/rvm/gems/ruby-2.0.0-p0@ta/gems/activerecord-2.3.18/lib/active_record/validations.rb:387:in `block in included'
/usr/local/rvm/gems/ruby-2.0.0-p0@ta/gems/activerecord-2.3.18/lib/active_record/validations.rb:386:in `class_eval'
/usr/local/rvm/gems/ruby-2.0.0-p0@ta/gems/activerecord-2.3.18/lib/active_record/validations.rb:386:in `included'
/usr/local/rvm/gems/ruby-2.0.0-p0@ta/gems/activerecord-2.3.18/lib/active_record/base.rb:3210:in `include'
/usr/local/rvm/gems/ruby-2.0.0-p0@ta/gems/activerecord-2.3.18/lib/active_record/base.rb:3210:in `block in <module:ActiveRecord>'
/usr/local/rvm/gems/ruby-2.0.0-p0@ta/gems/activerecord-2.3.18/lib/active_record/base.rb:3208:in `class_eval'
/usr/local/rvm/gems/ruby-2.0.0-p0@ta/gems/activerecord-2.3.18/lib/active_record/base.rb:3208:in `<module:ActiveRecord>'
/usr/local/rvm/gems/ruby-2.0.0-p0@ta/gems/activerecord-2.3.18/lib/active_record/base.rb:5:in `<top (required)>'
/home/marco/desenv/technical_analysis/Rakefile:14:in `block in <top (required)>'
/usr/local/rvm/gems/ruby-2.0.0-p0@ta/gems/rake-10.0.4/lib/rake/task.rb:246:in `call'
/usr/local/rvm/gems/ruby-2.0.0-p0@ta/gems/rake-10.0.4/lib/rake/task.rb:246:in `block in execute'

I had some debug and some test... Then i moved to 3.2.13 version of active record, and all worked as expected. I didn't find any docs for 3.2.18 version...

I don't mind to use 3.2.13 version, but I got curious about that.

First of all, you were using ActiveRecord 2.3.18, not 3.2.18 (the latter of which does not exist, to my knowledge). ActiveRecord 2.3 is getting to be quite old, and I don't believe it's compatible with Ruby 2.0, which you're using.

But the central issue, I think, is that in Rails 2.2-2.3, alias_method_chain was moved to the ActiveSupport module, before being moved back to Module in 3.0. You're not including ActiveSupport in your task, and I think that's what was causing the problem.

So I think a quick fix would be just to require "active_support".