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.
Activate captcha after unsuccessful login attempts
Created 11 years ago by Kostas Apazidis (KonApaz),
updated 10 years ago by Rohit Suthar.
Like gmail, if you have tree or more unsuccessful login attemps a captcha appears
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.