Entity classe nested inside the module results in invalid method name being generated

[uds]

when I try to persist an instance of the entity class defined inside the module, I'm getting following exception:

c:/Ruby/Ruby-1.9.2/lib/ruby/gems/1.9.1/gems/couch_potato-0.4.0/lib/couch_potato/view/custom_views.rb:34:in `instance_eval': (eval):1: syntax error, unexpected '/', expecting ';' or '\n' (SyntaxError)
def association_th_shop/product_belongs_to_supplier(v...
                        ^
(eval):1: syntax error, unexpected keyword_end, expecting $end
...upplier", view_parameters); end
...                               ^
    from c:/Ruby/Ruby-1.9.2/lib/ruby/gems/1.9.1/gems/couch_potato-0.4.0/lib/couch_potato/view/custom_views.rb:34:in `view'
    from c:/Ruby/Ruby-1.9.2/lib/ruby/gems/1.9.1/gems/simply_stored-0.5.3/lib/simply_stored/couch/belongs_to.rb:24:in `belongs_to'
...

here is my entity class:

module ThShop
  class Product
    include SimplyStored::Couch

    belongs_to :supplier
  end
end 

apparently, the problem is in the slash character inserted into the method name.

I'm using simply_stored 0.5.3 with Ruby 1.9.2-p180 on Windows.