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2008-11-29T17:42:58.503
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Once you get into MVC, it can be worthwhile to explore patterns beyond the "Gang of Four" book, and get into Martin Fowler's "<a href="http://martinfowler.com/eaaCatalog/index.html" rel="noreferrer">Patterns of Enterprise Application Architecture</a>." The <a href="http://martinfowler.com/eaaCatalog/registry.html" rel="noreferrer">Registry</a> pattern can be useful to make well-known objects available throughout the object hierarchy. Essentially a substitute for using global data. Many MVC frameworks also employ the <a href="http://martinfowler.com/eaaCatalog/frontController.html" rel="noreferrer">Front Controller</a> and the <a href="http://martinfowler.com/eaaCatalog/twoStepView.html" rel="noreferrer">Two-Step View</a> patterns. The "Model" in MVC is best designed as the <a href="http://martinfowler.com/eaaCatalog/domainModel.html" rel="noreferrer">Domain Model</a> pattern, although some frameworks (led by Rails) <a href="http://wiki.rubyonrails.org/rails/pages/Models" rel="noreferrer">conflate</a> the Model with the <a href="http://martinfowler.com/eaaCatalog/activeRecord.html" rel="noreferrer">ActiveRecord</a> pattern. I often <a href="http://karwin.blogspot.com/2008/05/activerecord-does-not-suck.html" rel="noreferrer">advise</a> that the relationship between a Model and ActiveRecord should be HAS-A, instead of IS-A. Also read about <a href="http://c2.com/cgi/wiki?ModelViewController" rel="noreferrer">ModelViewController</a> at the Portland Pattern Repository wiki. There is some good discussion about MVC, object-orientation, and other patterns that complement MVC, such as <a href="http://c2.com/cgi/wiki?ObserverPattern" rel="noreferrer">Observer</a>.
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1. POCommon Design Patterns for use in MVC Web Applications
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1. USBill Karwin
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