General question about rails controllers

[arwed]

I have a finished rails app for the web.
Now I want to interact with it with an iPhone app.

Do I create separate controllers for the communication with the
iphone, or how do I separate the logic for the iphone from the logic
for the web.

[Wes Duff]

With the web you are referencing the HTML layouts. Now you are accessing the XML. It's all about REST.
You don't necessarily have to create new controllers but you can if you wish, or you can make new blocks of code inside your current controllers.
That way you can keep your code light. But if your app gets to crazy it might be a good idea to make new controllers.
Wes Duff

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[Fredrik Jansson]

No the iphone communicates through http put get post requests. So you just need to render xml or json in your controllers 

[Aubrey Goodman]

I recommend namespacing your web service (XML/json) controllers and extending your existing controllers to inherit behavior, like this:

class SongsController < ActionController
before_filter :assign_songs, :only => :index

def index
end

private
def assign_songs
@songs = Song.all
end
end

class Api::SongsController < SongsController
def index
respond_to do |format|
format.json { render :json => @songs }
format.xml { render :xml => @songs }
end
end
end

This makes it easier to separate your tests. It also allows you to extend the controller, if you need extra or different logic in your web service than you have in your existing controller.

Hope this helps.
-Aubrey