Rails - Jul 2006 - When do you protect a method?

(I''m working through Agile again. Got halfway through last time).

How do you know when and when not to protect a method?

Specifically, in the depot application, we add price validation as a 
protected method "because it shouldn?t be called from outside the 
context of the model" (p 77).

Why wouldn''t you want the price validation called from outside of the 
model? And why are we adding the restof the validation as unprotected?



Thanks,
--
Austin

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