Search Models are a very elegant and powerful way to build an Active Data Provider. If you use them a lot, you'll quickly need to use scenarios, which will lead you to a very DRY Controller code.
Yii Framework Wiki
Wiki articles tagged with "Scenarios"
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"safe" and "unsafe" Model validators (massive assignments)
Ok, it is a little bit difficult to full understanding the unsafe validator.
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Understanding Scenarios
Scenarios are an extremely useful tool for separating validation tasks on any class you use derived from CModel. In this tutorial we will use CActiveRecord.