On Sunday, September 16, 2012 7:57:44 PM UTC+1, John Merlino wrote:
>
> class ActionNotFound < StandardError #:nodoc:
> end
>
> unless action_name = method_for_action(action_name)
> raise ActionNotFound, "The action '#{action}' could not be found for
> #{self.class.name}"
> end
>
> But why even bother to create the subclasses (which as shown above,
> have no definition of themselves), when substituting ActionNotFound
> with StandardError during the raise call will have the same effect.
>
Because it doesn't have the same effect. Raising specific subclasses allows
you to write targeted rescue clauses rather than rescuing indiscriminately.
Fred
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