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copied!<p>Rails (not ruby itself) is proud to be "Opinionated Software".</p> <p>What this means in practice is that the authors of rails have a certain target audience in mind (themselves basically) and aim rails specifically at that. If X feature isn't needed for that target audience, it doesn't get added.</p> <p>Off the top of my head, things that rails explicitly doesn't support that people may care about:</p> <ol> <li>Foreign keys in databases</li> <li>Connections to multiple DB's at once</li> <li>SOAP web services (since rails 2.0)</li> <li>Connections to multiple database <em>servers</em> at once</li> </ol> <p>That said, it is very easy to extend rails with plugins, and there are plugins which add all of the above functionality to rails, and a lot more, so I wouldn't really count these as limits.</p> <p>The only other caveat is that rails is <em>built</em> around the idea of creating CRUD web applications using MVC. If you're trying to do something which is NOT a CRUD web app (like twitter, which is actually a messaging system, or if you are insane and want to use a model like ASP.NET webforms) then you will also encounter problems. In this case you're better off not using rails, as you're essentially trying to build a boat out of bicycle parts.</p> <p>In all likelihood, the problems you will run into that can't just be fixed with a quick plugin or a day or 2 of coding are all inherent problems with the underlying C Ruby runtime (memory leaks, green threads, crap performance, etc).</p>

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