Rails - Aug 2009 - how to use ‘constantize’ in custom controller module

I have a module like this:

module Controller
  module LocaleModels
    def self.included(base)
      base.send :include, InstanceMethods
    end

    module InstanceMethods
      def locale_Lexeme; constantize_model(''Lexeme'') end
      def locale_Synthetic; constantize_model(''Synthetic'') end
      def locale_Property; constantize_model(''Property'') end

      private
      def constantize_model(common_part)
        eval(I18n.locale.capitalize + ''::'' +
common_part).constantize
      end
    end
  end
end

But I kept getting

NoMethodError (undefined method `constantize'' for
#<Class:0x2483b0c>)

I guess I cannot use ''constantize'' in a custom module.

But can you please offer some workaround?

Hello--
On Aug 9, 2009, at 9:39 AM, boblu wrote:
>
> I have a module like this:
>
> module Controller
>  module LocaleModels
>    def self.included(base)
>      base.send :include, InstanceMethods
>    end
>
>    module InstanceMethods
>      def locale_Lexeme; constantize_model(''Lexeme'') end
>      def locale_Synthetic; constantize_model(''Synthetic'')
end
>      def locale_Property; constantize_model(''Property'')
end
>
>      private
>      def constantize_model(common_part)
>        eval(I18n.locale.capitalize + ''::'' +
common_part).constantize
>      end
>    end
>  end
> end
>
> But I kept getting
>
> NoMethodError (undefined method `constantize'' for
#<Class:0x2483b0c>)
>
> I guess I cannot use ''constantize'' in a custom module.
>
> But can you please offer some workaround?
This may not be the problem, but why are you using eval?  
ActiveSupport::CoreExtensions::String::Inflections defines constantize  
as a method on String. It would seem to me that this would work:

(I18n.locale.capitalize + ''::'' + common_part).constantize

However, if you are looking for a class, investigate classify instead.

Maybe there''s something I''m missing here that requires use of
eval?
What happens in script/console if you type the expression in?

Thank you for your reply.

Actually, that eval is a typo. But I found by removing that
''eval'' did
resolved my problem here.

Thank you very much.

On 8月10日, 午前2:55, "s.ross" <cwdi...@gmail.com>
wrote:
> Hello--
> On Aug 9, 2009, at 9:39 AM,bobluwrote:
>
>
>
>
>
> > I have a module like this:
>
> > module Controller
> >  module LocaleModels
> >    def self.included(base)
> >      base.send :include, InstanceMethods
> >    end
>
> >    module InstanceMethods
> >      def locale_Lexeme; constantize_model(''Lexeme'')
end
> >      def locale_Synthetic;
constantize_model(''Synthetic'') end
> >      def locale_Property;
constantize_model(''Property'') end
>
> >      private
> >      def constantize_model(common_part)
> >        eval(I18n.locale.capitalize + ''::'' +
common_part).constantize
> >      end
> >    end
> >  end
> > end
>
> > But I kept getting
>
> > NoMethodError (undefined method `constantize'' for
#<Class:0x2483b0c>)
>
> > I guess I cannot use ''constantize'' in a custom
module.
>
> > But can you please offer some workaround?
>
> This may not be the problem, but why are you using eval?  
> ActiveSupport::CoreExtensions::String::Inflections defines constantize  
> as a method on String. It would seem to me that this would work:
>
> (I18n.locale.capitalize + ''::'' + common_part).constantize
>
> However, if you are looking for a class, investigate classify instead.
>
> Maybe there''s something I''m missing here that requires
use of eval?  
> What happens in script/console if you type the expression in?