On Thu, May 28, 2009 at 11:29 AM, Jeff S. email@example.com
Rick DeNatale wrote:
That’s different from any form of MVC I’ve ever heard of, including
Rails. Ordinarily, the views define the UI, and the Controller exists
strictly behind the scenes, as implementation details.
By UI I mean both output and input. And the Controller and View are
So the Rails notion of MVC seems very similar to this 1979 version.
Controllers process user input and decide which view to render, Views
do the rendering, and Models do the heavy application lifting.
That’s not how Rails works. You’re mostly right about the Models, but
the controllers are, as Phlip suggested, just “patch boards,” not for
user input. Sometimes a savvy user can send HTTP requests to a Rails
application without going through any view, but that’s not the intent.
No, I really understand how Rails, HTTP browsers work, and I maintain
that controllers handle input and decide how to change what the user
sees in response. This is partially in response to a later response
you made to Brian.
if we step back and see how the user interacts with a web application
through a browser, the first step is to make the initial request by
getting the browser to send an http request to the app. This happens
when he does something like typing a url into the address bar, or
following a link.
The http request, typically a get here is the input I’m talking about.
That input in the form of a request is routed to a controller, which
typically interacts with one or more models, then renders something.
That something is typically an html page from a rendered view, but
ajax call, often view are involved in the rendering of this response.
The only thing that views have to do with input is to provide
affordances by which the user may cause additional input requests to
happen, whether they be links, buttons which generate ajax requests,
etc. but the input is processed by the controller in the web
One piece of “heavy lifting” still done by the controllers is access
control; Models know how to answer questions, and don’t intrinsically
care who’s asking. It’s up to the Controllers to determine who gets to
Only in the simplest of access control. Usually there’s model
involvement here as well, although it’s often not obvious because the
controller interaction with the security model objects is done in
Subsequent variations of MVC, particularly those which piled
application logic into the controller are perversions of the original
“Perversions.” You know, there are ways of making a point that don’t
involve blanket insults of everyone who disagrees with you.
As others have pointed out, you are over reacting to the word. The
intention here was in the same sense as “a perversion of justice”. No
insult was intended.