Alright, so a better title here may have been "Progressive Enhancement with REST in CakePHP", but at least now I'll know you didn't read the question if your answer just refers to the difference between the two ;)
I'm pretty familiar with REST and how to integrate it with CakePHP, but I'm not 100% on board with how to still maintain a conventionally functioning website. Using Router::mapResources sounds like a great idea, but this creates a problem with maintaining the "gracefully degradation" version of the site, because both POST requests to /resource/ AND GET requests for /resource/add will route to the same action (add). Clearly I'll want this action to return a JSON object if they're using the REST api, but if they're using the degraded version of the site (no JS perhaps), it should be a add form, right?
What's the best way to deal with this. Do you route your REST requests to other action names using Router::resourceMap()? Do you do that crazy hack I saw to have the /api/ prefix part of the resourceMap so you can use api_action functions? Do you have the actions handle both REST and conventional requests via checking isAjax()? If so, how do you ensure that you can rely on the browser to properly support the other two request types?
I've searched around quite a bit but haven't found anything about how to keep conventional requests available in Cake along side REST, so if anyone has any advice or experience, I'd love to hear it!