Reusing code from Hartl Rails Tutorial : <p>I've almost completed Michael Hartl's Rails Tutorial.  Absolutely loved it, and loving what I've learnt about Rails.</p>

<p>It occurred to me, that I could reuse most of what we've done for the other app ideas that I have.  We have great user registration, authentication, security and testing.  It would be 'straightforward' to modify what I have here for other purposes.</p>

<p>I just want to ask if this is a standard practice when building new apps (reusing what you already have), and if there any gotchas or things I've not considered in looking to do so?</p>

<p>Loving getting back into coding, and can't wait to get my first idea out into the wild!</p>
