Dynamic Method Invocation, Part Uno

I'm sure I'll have a lot to share about dynamic method invocation in Ruby (including why it is that my fingers keep typing "invoice" instead of "invocation"). Hence "part uno."

So in the REST web services I'm working on, Merb automagically creates a method for me based on the name of the resource: resource-name_url. For example, if the name of the resource is "story," then the method name is "story_url." I need to call this method from a common render_create_success method I have created to be used by any successful resource creation. I use the "singularized" name of the controller itself to determine the name of the method to call to get the new resource's location (url). I can get away with this because: 1) I am not writing a general purpose method which will be distributed to all ends of the earth, 2) there is a reliable relationship between a REST resource name and its associated controller.

Anyway, here's the way I call the resource-name_url method:

url_method = self.class.name.downcase.singularize + "_url"
self.send(url_method, item)

... where item is the actual resource / data object (like the story, or anything else that has an id).

I suppose the important piece of information here from a dynamic method invocation standpoint is the usage of the send method including the passing of parameters to the target method.