A common source of confusion among new Yii users is how the `'safe'` validator works, how it works with other validators, and why it's necessary in the first place. This article means to clear up this confusion, as well as explain the notion of Massive Assignment. Summary: A model's validation rules serve **two** purposes: 1. IEnsure that fields entered in a form are entered properly
2. Define which form fields are allowed to be assigned to a $model variable

These are related, but not the same, and the distinction is important.

Looking at a set of validation rules