Ruby on Rails

Hey all,

Recently I've been looking into on how to return back to a previous referring URL and and the most common approach is:

redirect_to session[:return_to]
 

But some recommend:

redirect_to(session.delete(:return_to) || default)
 

How I understand it, in the second example we call session.delete so it will clear the return path since we will no longer need it, and we also use || to fall back to default URL in case the session is nil. Kind of makes sense, but what I am trying to understand is (and I couldn't find it anywhere explained) what are the implications of -not- using session.delete, how is it better, is it a security thing? And also falling back to default, in what cases can a session be nil? If there are other checks present (I am using Devise) should this be necessary?

Hope my questions make sense. Thank you.

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