fix for create_time_zone_conversion_attribute? problem

activerecord_reset_subclass_fix.rb

# lib/activerecord_reset_sublass_fix.rb

module ActiveRecord
  class Base
    def self.reset_subclasses #:nodoc:
      @@subclasses = {}
      subclasses.each do |subclass|
        next unless ActiveSupport::Dependencies.autoloaded?(subclass)
        (@@subclasses[subclass.superclass] ||= []) << subclass
      end
    end
  end
end

test.rb

# config/environments/test.rb

require 'activerecord_reset_subclass_fix'

AMAZING! this completely fixed my problems, i'm beyond delighted because I hadn't a clue what was going wrong! :D