# Optional route parameters for resource routes? **URL:** \ **Category:** Rails\ **Created:** [December 9, 2008, 10:23pm UTC](https://www.ruby-forum.com/t/optional-route-parameters-for-resource-routes/155259 "2008-12-09T22:23:45Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![benjohnson](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/3ec8ea/32.png) [@benjohnson](https://www.ruby-forum.com/u/benjohnson)\ **Post date:** [December 9, 2008, 10:23pm UTC](https://www.ruby-forum.com/t/optional-route-parameters-for-resource-routes/155259/1 "2008-12-09T22:23:45Z")
I have the following URL: /images/1.jpg?size=500 Where images is a resource setup via map.resources :images. I want to take advantage of caching, and caching ignores parameters. So I need to make size optional in the url: /images/1/500.jpg Something like that where the size can be built into the URL. I looked through all of the map.resources documentation and couldn’t find anything to do this. Any ideas how I can accomplish this? Thanks for your help. ---
**Author:** ![benjohnson](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/3ec8ea/32.png) [@benjohnson](https://www.ruby-forum.com/u/benjohnson)\ **Post date:** [December 10, 2008, 3:43am UTC](https://www.ruby-forum.com/t/optional-route-parameters-for-resource-routes/155259/2 "2008-12-10T03:43:40Z")
map.resources :images, :member =\> [:500, :1000] will map to 2 methods in your controller, but I think you might have problems giving ruby method names that start with numbers. you probably just have to make a specially entry in your routes file, something like this: map.cached\_image ‘/images/:id/:size’, :controller =\> “images”, :action =\> “show” in your show method just check for the presence of :show in the params and respond appropriately. On Dec 9, 3:23 pm, Ben J. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)