You should ask yourself if this is really the best way to accomplish what you are trying to do. Websites don't care about the final slashes in directories at all. For instance:
www.facebook.com/username
It will open you in the same place as:
www.facebook.com/username/
- , , , -. , , SEO, . , , . , .
: list show, URL. :
www.example.com/usa/california/list
www.example.com/usa/california/abc/list
country#list, "california" "abc". :
www.example.com/usa/californa/travel/show
www.example.com/usa/californa/average-income/show
country#show. . . . Rails Routing from Outside In.