Question: Within the scope of a Rails controller or a view:
How can I query the Rails routing mechanism to turn a relative url string (eg "/controllername/action/whatever" into the controller class that would be responsible for handling that request?

I want to do something like this:

```
controllerClass = someMethod("/controllername/action/whatever")

```

Where contorllerClass is an instance of Class.

I don't want to make any assumptions about a routing convention eg. that the "controllername" in the above example is always the name of the controller (because it's not).

Answer: 
Building off Carlos there: 

```
path = "/controllername/action/whatever"
c_name = ActionController::Routing::Routes.recognize_path(path)[:controller]
controllerClass = "#{c_name}_controller".camelize.constantize.new

```

will give you a new instance of the controller class.
`ActionController::Routing::Routes.recognize_path "/your/path/here"`

Would print:

`{:controller=>"corresponding_controller", :action=>"corresponding_action" } # Plus any params if they are passed`