Broken scope in rails 3

company.rb

class Company < ActiveRecord::Base
  has_many :users
end

console.rb

Loading development environment (Rails 3.0.0.beta3)
ruby-1.8.7-p249 > u = User.scoped; nil
 => nil
ruby-1.8.7-p249 > u.to_sql
 => "SELECT     \"users\".* FROM       \"users\"" 
ruby-1.8.7-p249 > u = u.id_or_name(:companies, '1'); nil
 => nil 
ruby-1.8.7-p249 > u.to_sql
 => "SELECT     \"users\".* FROM       \"users\" WHERE     (\"companies\".\"id\" = 1)" 
ruby-1.8.7-p249 > u = u.id_or_name(:divisions, '2'); nil
 => nil 
ruby-1.8.7-p249 > u.to_sql
 => "SELECT     \"users\".* FROM       \"users\" WHERE     (\"divisions\".\"id\" = 2)" 
ruby-1.8.7-p249 > u = User.scoped; nil
 => nil 
ruby-1.8.7-p249 > u = u.where(:divisions => { :id => '2' }); nil
 => nil 
ruby-1.8.7-p249 > u.to_sql
 => "SELECT     \"users\".* FROM       \"users\" WHERE     (\"divisions\".\"id\" = 2)" 
ruby-1.8.7-p249 > u = u.where(:companies => { :id => '1' }); nil
 => nil 
ruby-1.8.7-p249 > u.to_sql
 => "SELECT     \"users\".* FROM       \"users\" WHERE     (\"divisions\".\"id\" = 2) AND (\"companies\".\"id\" = 1)" 
ruby-1.8.7-p249 > u = User.scoped
 => [] 
ruby-1.8.7-p249 > u = u.id_or_name_same_model('2'); nil
 => nil 
ruby-1.8.7-p249 > u.to_sql
 => "SELECT     \"users\".* FROM       \"users\" WHERE     (\"users\".\"id\" = 2)" 
ruby-1.8.7-p249 > u = u.id_or_name_same_model('bob'); nil
 => nil 
ruby-1.8.7-p249 > u.to_sql
 => "SELECT     \"users\".* FROM       \"users\" WHERE     (\"users\".\"id\" = 2) AND (\"users\".\"name\" = 'bob')" 
ruby-1.8.7-p249 > 

division.rb

class Division < ActiveRecord::Base
  has_many :users
end

gistfile3.txt

rails -v # Rails 3.0.0.beta3
rails scope_bug
cd scope_bug
bundle install
rails generate model User name:string company_id:integer division_id:integer
rails generate model Company name:string
rails generate model Division name:string
# edit files as per
rake db:migrate
bust open console

user.rb

class User < ActiveRecord::Base
  belongs_to :company
  belongs_to :division

  scope(:id_or_name, lambda { |f, v|
    where(f => v.match(/^\d+$/) ? { :id => v } : { :name => v })
  })

  scope(:id_or_name_same_model, lambda { |v|
    where(v.match(/^\d+$/) ? { :id => v } : { :name => v })
  })
end