Controller:
---------------------

@user = User.find_by_email_and_token(params[:email], params[:token])

if @user
  @user.attributes = {:token => nil, :state => User::STATE_CONFIRMED}
  @user.save(false) #line 36
end

Error:
-----------------
RuntimeError in RegistrationController#confirm

/Library/Ruby/Gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/database_statements.rb:148:in `transaction'
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.2/lib/active_record/transactions.rb:182:in `transaction'
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.2/lib/active_record/transactions.rb:200:in `save!'
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.2/lib/active_record/transactions.rb:208:in `rollback_active_record_state!'
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.2/lib/active_record/transactions.rb:200:in `save!'
../app/controllers/registration_controller.rb:36:in `confirm'