[Rails] Re: inheriting from StandardError

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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