Listing data is essentially the most crucial part of websites. Be it products, articles, photos or whatnots, we usually need to provide the user the way to filter and/or sort the data by some preset parameters. I'll show you how to encapsulate such filtering within an object, build a user interface (in other words, a form) upon it, and use it with Kdyby/Doctrine's query objects to actually filter the data on the database level.
