On Thu, May 28, 2009 at 10:17 AM, Jeff Schwab <j...@schwabcenter.com> wrote: > > Phlip wrote: >> Railsters: >> >> I heard a rumor that the incorrect answer, "Controller", was in circulation >> out >> there. > > That's how I was taught MVC, long before I'd heard of Ruby: Models do > some basic checking, but business logic belongs in the controller. That > was the point of the controller; it gave a central place to put business > logic.
Well that's not the original intention of Trygve Reenskaug when he conceived of MVC: http://heim.ifi.uio.no/~trygver/1979/mvc-2/1979-12-MVC.pdf Trygve's original goal was separating UI logic from domain logic (what we commonly cause Business logic). The Model holds the domain information and methods for processing it. The View is concerned only with presenting the view to the user, a model might have multiple views presenting different subsets and/or projections of the model. The Controller deals with communicating with the user, it processes user input, and decides which views should be rendered and where. 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. Subsequent variations of MVC, particularly those which piled application logic into the controller are perversions of the original idea. Note also that Reenskaug talks about Editors which are objects which are associated with a view and are temporarily interposed between a controller and a view. I think if you squint just a little bit you can see the seeds of what Rails developers now refer to as a Presenter. -- Rick DeNatale Blog: http://talklikeaduck.denhaven2.com/ Twitter: http://twitter.com/RickDeNatale WWR: http://www.workingwithrails.com/person/9021-rick-denatale LinkedIn: http://www.linkedin.com/in/rickdenatale --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
